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Hydrogen embrittlement
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<h2 id="mechanisms">Mechanisms</h2> <p>Hydrogen embrittlement is a complex process involving a number of distinct contributing micro-mechanisms, not all of which need to be present. The mechanisms include the formation of brittle <a href="/facts/Hydride/v2rlBGMg">hydrides</a>, the creation of voids that can lead to high-pressure bubbles, enhanced <a href="/facts/Delamination/DfSp7rpc">decohesion</a> at internal surfaces and localised plasticity at crack tips that assist in the propagation of cracks.<a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a> There is a great variety of mechanisms that have been proposed<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a> and investigated as to the cause of brittleness once <a href="/facts/Diffusion/KbAxroBa">diffusible</a> hydrogen has been <a href="/facts/Solubility/kLE9h3Jb">dissolved</a> into the metal.<a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a> In recent years, it has become widely accepted that HE is a complex process dependent on material and environment so that no single mechanism applies exclusively.<a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a> </p> <ul><li>Internal pressure: At high hydrogen concentrations, absorbed hydrogen species recombine in voids to form hydrogen molecules (H2), creating pressure from within the metal. This pressure can increase to levels where cracks form, commonly designated hydrogen-induced cracking (HIC), as well as <a href="/facts/Blister/qGhqaeQV">blisters</a> forming on the specimen surface, designated hydrogen-induced blistering. These effects can reduce <a href="/facts/Ductility/SBJsahEk">ductility</a> and <a href="/facts/Ultimate_tensile_strength/Cv2jPplR">tensile strength</a>.<a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a></li> <li>Hydrogen enhanced localised <a href="/facts/Plasticity_(physics)/2VKo6keA">plasticity</a> (HELP): Hydrogen increases the <a href="/facts/Nucleation/efUVLsLR">nucleation</a> and <a href="/facts/Dislocation_creep/rkxyzRg9">movement</a> of <a href="/facts/Dislocation/m1tkJYIq">dislocations</a> at a crack tip. HELP results in crack propagation by localised <a href="/facts/Ductile_failure/nxDNAj0d">ductile failure</a> at the crack tip with less <a href="/facts/Deformation_(engineering)/z1LEmkQX">deformation</a> occurring in the surrounding material, which gives a <a href="/facts/Brittleness/cn27H2vg">brittle</a> appearance to the <a href="/facts/Fracture/nxDNAj0d">fracture</a>.<a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a><a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a></li> <li>Hydrogen decreased dislocation emission: <a href="/facts/Molecular_dynamics/yR3DNt6U">Molecular dynamics</a> simulations reveal a <a href="/facts/Ductile-to-brittle_transition/SBJsahEk">ductile-to-brittle transition</a> caused by the suppression of dislocation emission at the crack tip by dissolved hydrogen. This prevents the crack tip rounding-off, so the sharp crack then leads to brittle-cleavage failure.<a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a></li> <li>Hydrogen enhanced decohesion (HEDE): Interstitial hydrogen lowers the stress required for metal atoms to fracture apart. HEDE can only occur when the local concentration of hydrogen is high, such as due to the increased hydrogen <a href="/facts/Solubility/kLE9h3Jb">solubility</a> in the <a href="/facts/Tensile_stress/ErAXDbbd">tensile stress</a> field at a crack tip, at stress concentrators, or in the tension field of <a href="/facts/Edge_dislocation/m1tkJYIq">edge dislocations</a>.<a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a></li> <li><a href="/facts/Metal_hydride/v2rlBGMg">Metal hydride</a> formation: The formation of brittle hydrides with the parent material allows cracks to propagate in a brittle fashion. This is particularly a problem with <a href="/facts/Vanadium/UvKkKTSm">vanadium</a> alloys,<a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a> while most other structural alloys do not easily form hydrides.</li> <li><a href="/facts/Phase_transformation_crystallography/n6qTKq3E">Phase transformations</a>: Hydrogen can induce phase transformations in some materials, and the new phase may be less ductile.</li></ul> <h2 id="material-susceptibility">Material susceptibility</h2> <p>Hydrogen embrittles a variety of metals including steel,<a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a><a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a> <a href="/facts/Aluminium/7wmR8jYE">aluminium</a> (at high temperatures only<a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a>), and <a href="/facts/Titanium/53ArnDoy">titanium</a>.<a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a> <a href="/facts/Austempering/WEyK2TQr">Austempered</a> iron is also susceptible, though austempered steel (and possibly other austempered metals) displays increased resistance to hydrogen embrittlement.<a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a> NASA has reviewed which metals are susceptible to embrittlement and which only prone to hot hydrogen attack: <a href="/facts/Nickel/KwMCHYRP">nickel</a> alloys, <a href="/facts/Austenitic_stainless_steel/oaJRCwTf">austenitic stainless steels</a>, aluminium and alloys, <a href="/facts/Copper/I8PEE8oX">copper</a> (including alloys, e.g. <a href="/facts/Beryllium_copper/YVPmtURb">beryllium copper</a>).<a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a> Sandia has also produced a comprehensive guide.<a class="footnote-ref" id="fnref:39" href="#fn:39"><sup>39</sup></a> </p> <h3>Steels</h3> <p>Steel with an ultimate <a href="/facts/Tensile_strength/Cv2jPplR">tensile strength</a> of less than 1000 MPa (~145,000 psi) or hardness of less than <a href="/facts/Hardness_comparison/zkwUmdLu">HRC</a> 32 on the <a href="/facts/Rockwell_scale/vU2b7TNT">Hardness Rockwell Scale</a> is not generally considered susceptible to hydrogen embrittlement. As an example of severe hydrogen embrittlement, the elongation at failure of 17-4PH precipitation hardened <a href="/facts/Stainless_steel/IDdo8bEx">stainless steel</a> was measured to drop from 17% to only 1.7% when smooth specimens were exposed to high-pressure hydrogen<a class="footnote-ref" id="fnref:40" href="#fn:40"><sup>40</sup></a> </p><p>As the <a href="/facts/Strength_of_materials/CE77cUcB">strength</a> of steels increases, the <a href="/facts/Fracture_toughness/stup0Kd3">fracture toughness</a> decreases, so the likelihood that hydrogen embrittlement will lead to fracture increases. In <a href="/facts/High-strength_low-alloy_steel/mqXoQdKe">high-strength steels</a>, anything above a <a href="/facts/Hardness/PtGn6E20">hardness</a> of HRC 32 may be susceptible to early hydrogen cracking after <a href="/facts/Plating/3tRPlr6x">plating</a> processes that introduce hydrogen. They may also experience long-term failures any time from weeks to decades after being placed in service due to accumulation of hydrogen over time from <a href="/facts/Cathodic_protection/6EjWvH1r">cathodic protection</a> and other sources. Numerous failures have been reported in the hardness range from HRC 32-36 and above; therefore, parts in this range should be checked during <a href="/facts/Quality_control/lnXbvqvp">quality control</a> to ensure they are not susceptible. </p><p>Testing the fracture toughness of hydrogen-charged, embrittled specimens is complicated by the need to keep charged specimens very cold, in liquid nitrogen, to prevent the hydrogen diffusing away.<a class="footnote-ref" id="fnref:41" href="#fn:41"><sup>41</sup></a> </p> <h3>Copper</h3> <p><a href="/facts/List_of_copper_alloys/8m7XEQTW">Copper alloys</a> which contain <a href="/facts/Oxygen/acyn6o8r">oxygen</a> can be embrittled if exposed to hot hydrogen. The hydrogen <a href="/facts/Diffusion/KbAxroBa">diffuses</a> through the copper and reacts with inclusions of <a href="/facts/Copper(I)_oxide/lVQAEWXx">Cu2O</a>, forming 2 metallic Cu atoms and <a href="/facts/Water/0lkXnJPK">H2O</a>, which then forms pressurized bubbles of <a href="/facts/Steam/RDGCdmzT">steam</a> at the <a href="/facts/Grain_boundary/3r6klMTy">grain boundaries</a>. This process can force the grains of the <a href="/facts/Crystal_lattice/7gQKTsXk">crystal lattice</a> away from each other, in a process known as <i>steam embrittlement</i>. </p> <h3>Vanadium, nickel, and titanium</h3> <p><a href="/facts/Alloy/I7w7WQWR">Alloys</a> of <a href="/facts/Vanadium/UvKkKTSm">vanadium</a>, <a href="/facts/Nickel/KwMCHYRP">nickel</a>, and <a href="/facts/Titanium/53ArnDoy">titanium</a> have a high hydrogen <a href="/facts/Solubility/kLE9h3Jb">solubility</a>, and can therefore <a href="/facts/Absorption_(chemistry)/XGeB64bC">absorb</a> significant amounts of hydrogen. This can lead to <a href="/facts/Hydride/v2rlBGMg">hydride</a> formation, resulting in irregular volume expansion and reduced <a href="/facts/Ductility/SBJsahEk">ductility</a> (because metallic hydrides are fragile <a href="/facts/Ceramic_engineering/WfrwB0F9">ceramic materials</a>). This is a particular issue when looking for non-<a href="/facts/Palladium/AXMwDFxs">palladium</a>-based alloys for use in hydrogen separation membranes.<a class="footnote-ref" id="fnref:42" href="#fn:42"><sup>42</sup></a> </p> <h2 id="fatigue">Fatigue</h2> <p>While most failures in practice have been through fast failure, there is experimental evidence that hydrogen also affects the <a href="/facts/Fatigue_(material)/zmJY8hMt">fatigue</a> properties of steels. This is entirely expected given the nature of the embrittlement mechanisms proposed for fast fracture.<a class="footnote-ref" id="fnref:43" href="#fn:43"><sup>43</sup></a><a class="footnote-ref" id="fnref:44" href="#fn:44"><sup>44</sup></a> In general hydrogen embrittlement has a strong effect on high-<a href="/facts/Stress_(mechanics)/ErAXDbbd">stress</a>, <a href="/facts/Low-cycle_fatigue/AQs8R7NA">low-cycle fatigue</a> and very little effect on high-cycle fatigue.<a class="footnote-ref" id="fnref:45" href="#fn:45"><sup>45</sup></a><a class="footnote-ref" id="fnref:46" href="#fn:46"><sup>46</sup></a> </p> <h2 id="environmental-embrittlement">Environmental embrittlement</h2> <p>Hydrogen embrittlement is a volume effect: it affects the volume of the material. Environmental embrittlement<a class="footnote-ref" id="fnref:47" href="#fn:47"><sup>47</sup></a> is a surface effect where molecules from the atmosphere surrounding the material under test are adsorbed onto the fresh crack surface. This is most clearly seen from <a href="/facts/Fatigue_(material)/zmJY8hMt">fatigue</a> measurements where the measured crack growth rates<a class="footnote-ref" id="fnref:48" href="#fn:48"><sup>48</sup></a> can be an order of magnitude higher in hydrogen than in air. That this effect is due to adsorption, which saturates when the crack surface is completely covered, is understood from the weak dependence of the effect on the pressure of hydrogen.<a class="footnote-ref" id="fnref:49" href="#fn:49"><sup>49</sup></a> </p><p>Environmental embrittlement is also observed to reduce <a href="/facts/Fracture_toughness/stup0Kd3">fracture toughness</a> in <a href="/facts/Fast_fracture/cp54caju">fast fracture</a> tests, but the severity is much reduced compared with the same effect in fatigue.<a class="footnote-ref" id="fnref:50" href="#fn:50"><sup>50</sup></a> </p><p>Hydrogen embrittlement occurs when a previously embrittled material has low fracture toughness regardless of the atmosphere in which it is tested. Environmental embrittlement occurs when the low fracture toughness is only observed in that atmosphere. </p> <h2 id="sources-of-hydrogen">Sources of hydrogen</h2> <p>During manufacture, hydrogen can be dissolved into the component by processes such as <a href="/facts/Phosphating/vY5GpVg1">phosphating</a>, <a href="/facts/Pickling_(metal)/nnhPycNe">pickling</a>, <a href="/facts/Electroplating/HbKf0SBb">electroplating</a>, <a href="/facts/Casting/cFJ0hPuU">casting</a>, <a href="/facts/Carbonizing/o8LenJPn">carbonizing</a>, surface <a href="/facts/Cleaning/DVzmMbl9">cleaning</a>, <a href="/facts/Electrochemical_machining/BXmm3fjy">electrochemical machining</a>, <a href="/facts/Welding/6EJ62mYV">welding</a>, <a href="/facts/Rolling_(metalworking)/FQ6AQVld">hot roll forming</a>, and <a href="/facts/Heat_treating/xR2tVyTU">heat treatments</a>. </p><p>During service use, hydrogen can be dissolved into the metal from wet <a href="/facts/Corrosion/lIC7H4we">corrosion</a> or through misapplication of protection measures such as <a href="/facts/Cathodic_protection/6EjWvH1r">cathodic protection</a>.<a class="footnote-ref" id="fnref:51" href="#fn:51"><sup>51</sup></a> In one case of failure during construction of the San Francisco–Oakland Bay Bridge <a href="/facts/Galvanization/htRtThFL">galvanized</a> (i.e. <a href="/facts/Galvanization/htRtThFL">zinc-plated</a>) rods were left wet for 5 years before being <a href="/facts/Prestressed_concrete/0fFlgCju">tensioned</a>. The reaction of the zinc with water introduced hydrogen into the steel.<a class="footnote-ref" id="fnref:52" href="#fn:52"><sup>52</sup></a><a class="footnote-ref" id="fnref:53" href="#fn:53"><sup>53</sup></a><a class="footnote-ref" id="fnref:54" href="#fn:54"><sup>54</sup></a> </p><p>A common case of embrittlement during manufacture is poor <a href="/facts/Arc_welding/SFDgoY2g">arc welding</a> practice, in which hydrogen is released from moisture, such as in the coating of welding electrodes or from damp <a href="/facts/Welding_rods/2ndqGfhN">welding rods</a>.<a class="footnote-ref" id="fnref:55" href="#fn:55"><sup>55</sup></a><a class="footnote-ref" id="fnref:56" href="#fn:56"><sup>56</sup></a> To avoid atomic hydrogen formation in the high temperature <a href="/facts/Plasma_(physics)/1d3btMVU">plasma</a> of the <a href="/facts/Arc_welding/SFDgoY2g">arc</a>, welding rods have to be perfectly dried in an oven at the appropriate temperature and duration before use. Another way to minimize the formation of hydrogen is to use special low-hydrogen electrodes for welding <a href="/facts/High-strength_low-alloy_steel/mqXoQdKe">high-strength steels</a>. </p><p>Apart from arc welding, the most common problems are from chemical or electrochemical processes which, by reduction of hydrogen ions or water, generate hydrogen atoms at the surface, which rapidly dissolve in the metal. One of these chemical reactions involves <a href="/facts/Hydrogen_sulfide/UbCqjMMk">hydrogen sulfide</a> (<a href="/facts/Hydrogen_sulfide/UbCqjMMk">H2S</a>) in <a href="/facts/Sulfide_stress_cracking/QHaqw7Gh">sulfide stress cracking</a> (SSC), a significant problem for the oil and gas industries.<a class="footnote-ref" id="fnref:57" href="#fn:57"><sup>57</sup></a> </p><p>After a manufacturing process or treatment which may cause hydrogen ingress, the component should be baked to remove or immobilize the hydrogen.<a class="footnote-ref" id="fnref:58" href="#fn:58"><sup>58</sup></a> </p> <h2 id="prevention">Prevention</h2> <p>Hydrogen embrittlement can be prevented through several methods, all of which are centered on minimizing contact between the metal and hydrogen, particularly during fabrication and the <a href="/facts/Electrolysis_of_water/Vb0hYQPW">electrolysis of water</a>. Embrittling procedures such as <a href="/facts/Pickling_(metal)/nnhPycNe">acid pickling</a> should be avoided, as should increased contact with elements such as <a href="/facts/Sulfur/IK0amTfM">sulfur</a> and <a href="/facts/Phosphate/FDGVCxUG">phosphate</a>. </p><p>If the metal has not yet started to crack, hydrogen embrittlement can be reversed by removing the hydrogen source and causing the hydrogen within the metal to diffuse out through <a href="/facts/Heat_treating/xR2tVyTU">heat treatment</a>. This de-embrittlement process, known as <a href="/facts/Low_hydrogen_annealing/pXUg1RA2">low hydrogen annealing</a> or "baking", is used to overcome the weaknesses of methods such as electroplating which introduce hydrogen to the metal, but is not always entirely effective because a sufficient time and temperature must be reached.<a class="footnote-ref" id="fnref:59" href="#fn:59"><sup>59</sup></a> Tests such as ASTM F1624 can be used to rapidly identify the minimum baking time (by testing using careful <a href="/facts/Design_of_experiments/VMrNftbr">design of experiments</a>, a relatively low number of samples can be used to pinpoint this value). Then the same test can be used as a quality control check to evaluate if baking was sufficient on a per-batch basis. </p><p>In the case of welding, often pre-heating and post-heating the metal is applied to allow the hydrogen to diffuse out before it can cause any damage. This is specifically done with high-strength steels and <a href="/facts/Low_alloy_steel/DR2tGHEH">low alloy steels</a> such as the <a href="/facts/Chromium/6sVk6Uu7">chromium</a>/<a href="/facts/Molybdenum/RX6vp2bF">molybdenum</a>/<a href="/facts/Vanadium/UvKkKTSm">vanadium</a> <a href="/facts/Alloy/I7w7WQWR">alloys</a>. Due to the time needed to re-combine hydrogen atoms into the hydrogen molecules, hydrogen cracking due to welding can occur over 24 hours after the welding operation is completed. </p><p>Another way of preventing this problem is through materials selection. This will build an inherent resistance to this process and reduce the need for post-processing or constant monitoring for failure. Certain metals or alloys are highly susceptible to this issue, so choosing a material that is minimally affected while retaining the desired properties would also provide an optimal solution. Much research has been done to catalogue the compatibility of certain metals with hydrogen.<a class="footnote-ref" id="fnref:60" href="#fn:60"><sup>60</sup></a> Tests such as ASTM F1624 can also be used to rank alloys and coatings during materials selection to ensure (for instance) that the threshold of cracking is below the threshold for hydrogen-assisted stress corrosion cracking. Similar tests can also be used during quality control to more effectively qualify materials being produced in a rapid and comparable manner. </p> <h3>Surface coatings</h3> <p>Coatings act as a barrier between the metal substrate and the surrounding environment, hindering the ingress of hydrogen atoms. Various techniques can be used to apply coatings, such as electroplating, chemical conversion coatings, or organic coatings. The choice of coating depends on factors such as the type of metal, the operating environment, and the specific requirements of the application. </p><p><a href="/facts/Electroplating/HbKf0SBb">Electroplating</a> is a commonly used method to deposit a protective layer onto the metal surface. This process involves immersing the metal substrate into an <a href="/facts/Electrolyte/4YE8bIVa">electrolyte</a> solution containing metal ions. By applying an electric current, the metal ions are reduced and form a metallic coating on the substrate. Electroplating can provide an excellent protective layer that enhances corrosion resistance and reduces the susceptibility to hydrogen embrittlement. </p><p>Chemical conversion coatings are another effective method for surface protection. These coatings are typically formed through chemical reactions between the metal substrate and a chemical solution. The conversion coating chemically reacts with the metal surface, resulting in a thin, tightly adhering protective layer. Examples of conversion coatings include chromate, phosphate, and oxide coatings. These coatings not only provide a barrier against hydrogen diffusion but also enhance the metal's corrosion resistance. </p><p>Organic coatings, such as <a href="/facts/Paints/Q176AsIG">paints</a> or polymer coatings, offer additional protection against hydrogen embrittlement. These coatings form a physical barrier between the metal surface and the environment. They provide excellent adhesion, flexibility, and resistance to environmental factors. Organic coatings can be applied through various methods, including spray coating, <a href="/facts/Dip_coating/WQInXWLR">dip coating</a>, or <a href="/facts/Powder_coating/Ud71AUTH">powder coating</a>. They can be formulated with additives to further enhance their resistance to hydrogen ingress. </p><p><a href="/facts/Thermal_spraying/NY41V56m">Thermally sprayed coatings</a> offer several advantages in the context of hydrogen embrittlement prevention. The coating materials used in this process are often composed of materials with excellent resistance to hydrogen diffusion, such as ceramics or cermet alloys. These materials have a low permeability to hydrogen, creating a robust barrier against hydrogen ingress into the metal substrate.<a class="footnote-ref" id="fnref:61" href="#fn:61"><sup>61</sup></a> </p> <h2 id="testing">Testing</h2> <p>Most analytical methods for hydrogen embrittlement involve evaluating the effects of (1) internal hydrogen from production and/or (2) external sources of hydrogen such as cathodic protection. For steels, it is important to test specimens in the lab that are at least as hard (or harder) as the final parts will be. Ideally, specimens should be made of the final material or the nearest possible representative, as fabrication can have a profound impact on resistance to hydrogen-assisted cracking. </p><p>There are numerous <a href="/facts/ASTM/xzdCexYJ">ASTM</a> standards for testing for hydrogen embrittlement: </p> <ul><li>ASTM B577 is the <i>Standard Test Methods for Detection of Cuprous Oxide (Hydrogen Embrittlement Susceptibility) in Copper</i>. The test focuses on hydrogen embrittlement of copper alloys, including a metallographic evaluation (method A), testing in a hydrogen charged chamber followed by metallography (method B), and method C is the same as B but includes a bend test.</li> <li>ASTM B839 is the <i>Standard Test Method for Residual Embrittlement in Metallic Coated, Externally Threaded Articles, Fasteners, and Rod-Inclined Wedge Method</i>.</li> <li>ASTM F519 is the <i>Standard Test Method for Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments</i>. There are 7 different samples designs and the two most commons tests are (1) the rapid test, the <a href="/facts/Rising_step_load_testing/vfXBvVPK">Rising step load testing</a> (RSL) method per ASTM F1624 and (2) the sustained load test, which takes 200 hours. The sustained load test is still included in many legacy standards, but the RSL method is increasingly being adopted due to speed, repeatability, and the quantitative nature of the test. The RSL method provides an accurate ranking of the effect of hydrogen from both internal and external sources.</li> <li>ASTM F1459 is the <i>Standard Test Method for Determination of the Susceptibility of Metallic Materials to Hydrogen Gas Embrittlement (HGE) Test</i>.<a class="footnote-ref" id="fnref:62" href="#fn:62"><sup>62</sup></a> The test uses a diaphragm loaded with a differential pressure.</li> <li>ASTM G142 is the <i>Standard Test Method for Determination of Susceptibility of Metals to Embrittlement in Hydrogen Containing Environments at High Pressure, High Temperature, or Both</i>.<a class="footnote-ref" id="fnref:63" href="#fn:63"><sup>63</sup></a> The test uses a cylindrical tensile specimen tested into an enclosure pressurized with hydrogen or <a href="/facts/Helium/yRul93TG">helium</a>.</li> <li>ASTM F1624 is the <i>Standard Test Method for Measurement of Hydrogen Embrittlement Threshold in Steel by the Incremental Step Loading Technique</i>. The test uses the incremental step loading (ISL) or <a href="/facts/Rising_step_load_testing/vfXBvVPK">Rising step load testing</a> (RSL) method for quantitatively testing for the Hydrogen Embrittlement threshold stress for the onset of Hydrogen-Induced Cracking due to platings and coatings from Internal Hydrogen Embrittlement (IHE) and Environmental Hydrogen Embrittlement (EHE).<a class="footnote-ref" id="fnref:64" href="#fn:64"><sup>64</sup></a><a class="footnote-ref" id="fnref:65" href="#fn:65"><sup>65</sup></a> F1624 provides a rapid, quantitative measure of the effects of hydrogen both from internal sources and external sources (which is accomplished by applying a selected voltage in an electrochemical cell). The F1624 test is performed by comparing a standard fast-fracture tensile strength to the fracture strength from a <a href="/facts/Rising_step_load_testing/vfXBvVPK">Rising step load testing</a> practice where the load is held for hour(s) at each step. In many cases, it can be performed in 30 hours or less.</li> <li>ASTM F1940 is the <i>Standard Test Method for Process Control Verification to Prevent Hydrogen Embrittlement in Plated or Coated Fasteners</i>.<a class="footnote-ref" id="fnref:66" href="#fn:66"><sup>66</sup></a> While the title now explicitly includes the word fasteners, F1940 was not originally intended for these purposes. F1940 is based on the F1624 method and is similar to F519 but with different root radius and stress concentration factors. When specimens exhibit a threshold cracking of 75% of the net fracture strength, the plating bath is considered to be 'non-embrittling'.</li></ul> <p>There are many other related standards for hydrogen embrittlement: </p> <ul><li>NACE TM0284-2003 (<a href="/facts/NACE_International/RQT7e41N">NACE International</a>) Resistance to Hydrogen-Induced Cracking</li> <li>ISO 11114-4:2005 (<a href="/facts/International_Organization_for_Standardization/IacYR7Yg">ISO</a>)Test methods for selecting metallic materials resistant to hydrogen embrittlement.</li> <li>Standard Test Method for Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments<a class="footnote-ref" id="fnref:67" href="#fn:67"><sup>67</sup></a></li></ul> <h2 id="notable-failures-from-hydrogen-embrittlement">Notable failures from hydrogen embrittlement</h2> <ul><li>In 2013, six months prior to opening, the <a href="/facts/Eastern_span_replacement_of_the_San_Francisco%E2%80%93Oakland_Bay_Bridge/1dqMXUVv">East Span of the Oakland Bay Bridge</a> failed during testing. Catastrophic failures occurred in <a href="/facts/Shear_bolt/onzMuorF">shear bolts</a> in the span, after only two weeks of service, with the failure attributed to embrittlement (see details above).<a class="footnote-ref" id="fnref:68" href="#fn:68"><sup>68</sup></a><a class="footnote-ref" id="fnref:69" href="#fn:69"><sup>69</sup></a></li> <li>In the <a href="/facts/City_of_London/Psl9khal">City of London</a>, <a href="/facts/122_Leadenhall_Street/HEhXhre3">122 Leadenhall Street</a>, generally known as 'the Cheesegrater', suffered from hydrogen embrittlement in steel bolts, with three breaking and falling in 2014 and 2015. <a href="/facts/Severfield/vLUtotYV">Severfield</a>, the building's <a href="/facts/Structural_steel/u5UsVypD">structural steel</a> contractor replaced most of the 3,000 fasteners involved at a cost of £6m.<a class="footnote-ref" id="fnref:70" href="#fn:70"><sup>70</sup></a><a class="footnote-ref" id="fnref:71" href="#fn:71"><sup>71</sup></a></li></ul> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Hydrogen_analyzer/WDFKBsqv">Hydrogen analyzer</a></li> <li><a href="/facts/Hydrogen_damage/0n1UFRnW">Hydrogen damage</a></li> <li><a href="/facts/Hydrogen_piping/y1RrcBov">Hydrogen piping</a></li> <li><a href="/facts/Hydrogen_safety/4nzzGdPD">Hydrogen safety</a></li> <li><a href="/facts/Low_hydrogen_annealing/pXUg1RA2">Low hydrogen annealing</a></li> <li><a href="/facts/Nascent_hydrogen/hY7DQuy1">Nascent hydrogen</a></li> <li><a href="/facts/Oxygen-free_copper/cEEBfsBG">Oxygen-free copper</a></li> <li><a href="/facts/Stress_corrosion_cracking/2ezVSAUP">Stress corrosion cracking</a></li> <li><a href="/facts/White_etching_cracks/oRpaNto8">White etching cracks</a></li> <li><a href="/facts/Zircotec/nAbekomf">Zircotec</a></li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="http://www.msm.cam.ac.uk/phase-trans/2014/hydrogen.html">Resources on hydrogen embrittlement, Cambridge University</a></li> <li><a href="https://web.archive.org/web/20110518222127/http://www.uni-saarland.de/fak8/wwm/research/phd_barnoush/hydrogen.pdf">Hydrogen embrittlement</a></li> <li><a href="http://www.hydrogen.energy.gov/pdfs/progress05/v_a_4_adams.pdf">Hydrogen purity plays a critical role</a> <a href="https://web.archive.org/web/20130301114807/http://www.hydrogen.energy.gov/pdfs/progress05/v_a_4_adams.pdf">Archived</a> 2013-03-01 at the <a href="/facts/Wayback_Machine/nmQ3a6JC">Wayback Machine</a></li> <li><a href="http://www.sandia.gov/matlsTechRef/">A Sandia National Lab technical reference manual.</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Lynch, S. P. (2011-01-01), Raja, V. S.; Shoji, Tetsuo (eds.), "2 - Hydrogen embrittlement (HE) phenomena and mechanisms", Stress Corrosion Cracking, Woodhead Publishing Series in Metals and Surface Engineering, Woodhead Publishing, pp. 90–130, ISBN 978-1-84569-673-3, retrieved 2022-06-10 <a href="978-1-84569-673-3" target="_blank">978-1-84569-673-3</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Lee, Jonathan A. (April 2016). "Hydrogen Embrittlement" (PDF). NASA. Archived from the original (PDF) on Feb 5, 2021. Retrieved 18 December 2020 – via CORE. <a href="https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf" target="_blank">https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Jewett, R. P.; Walter, R. J.; Chandler, W. T.; Frohmberg, R. P. (1973-03-01). "Hydrogen environment embrittlement of metals". NTRS. NASA. Archived from the original on May 25, 2024. <a href="https://ntrs.nasa.gov/citations/19730012717" target="_blank">https://ntrs.nasa.gov/citations/19730012717</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Safety Standard for Hydrogen and Hydrogen Systems: Guidelines for Hydrogen System Design, Materials Selection, Operations, Storage, and Transportation (PDF). Washington, DC: Office of Safety and Mission Assurance, National Aeronautics and Space Administration. 1997-10-29. p. A-93. NSS 1740.16. Retrieved 2022-06-27. <a href="https://www.energy.gov/sites/prod/files/2014/03/f11/871916.pdf" target="_blank">https://www.energy.gov/sites/prod/files/2014/03/f11/871916.pdf</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Johnson, William H. (31 December 1875). "II. On some remarkable changes produced in iron and steel by the action of hydrogen and acids". Proceedings of the Royal Society of London. 23 (156–163): 168–179. doi:10.1098/rspl.1874.0024. eISSN 2053-9126. ISSN 0370-1662. JSTOR 113285. S2CID 97579399. <a href="https://doi.org/10.1098%2Frspl.1874.0024" target="_blank">https://doi.org/10.1098%2Frspl.1874.0024</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Bhadhesia, Harry. "Prevention of Hydrogen Embrittlement in Steels" (PDF). Phase Transformations & Complex Properties Research Group, Cambridge University. Retrieved 17 December 2020. <a href="https://www.phase-trans.msm.cam.ac.uk/2016/preventing_hydrogen.pdf" target="_blank">https://www.phase-trans.msm.cam.ac.uk/2016/preventing_hydrogen.pdf</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>"What is hydrogen embrittlement? – Causes, effects and prevention". TWI - The Welding Institute. Retrieved 18 December 2020. <a href="https://www.twi-global.com/technical-knowledge/faqs/what-is-hydrogen-embrittlement" target="_blank">https://www.twi-global.com/technical-knowledge/faqs/what-is-hydrogen-embrittlement</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>Lee, Jonathan A. (April 2016). "Hydrogen Embrittlement" (PDF). NASA. Archived from the original (PDF) on Feb 5, 2021. Retrieved 18 December 2020 – via CORE. <a href="https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf" target="_blank">https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>Oriani, R A (August 1978). "Hydrogen Embrittlement of Steels". Annual Review of Materials Science. 8 (1): 327–357. Bibcode:1978AnRMS...8..327O. doi:10.1146/annurev.ms.08.080178.001551. ISSN 0084-6600. <a href="https://www.annualreviews.org/doi/10.1146/annurev.ms.08.080178.001551" target="_blank">https://www.annualreviews.org/doi/10.1146/annurev.ms.08.080178.001551</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>"Hydrogen Embrittlement". Metallurgy for Dummies. Retrieved 18 December 2020. <a href="https://www.metallurgyfordummies.com/hydrogen-embrittlement.html" target="_blank">https://www.metallurgyfordummies.com/hydrogen-embrittlement.html</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>Lynch, S. P. (2011-01-01), Raja, V. S.; Shoji, Tetsuo (eds.), "2 - Hydrogen embrittlement (HE) phenomena and mechanisms", Stress Corrosion Cracking, Woodhead Publishing Series in Metals and Surface Engineering, Woodhead Publishing, pp. 90–130, ISBN 978-1-84569-673-3, retrieved 2022-06-10 <a href="978-1-84569-673-3" target="_blank">978-1-84569-673-3</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></p></li> <li id="fn:12"><p>Lee, Jonathan A. (April 2016). "Hydrogen Embrittlement" (PDF). NASA. Archived from the original (PDF) on Feb 5, 2021. Retrieved 18 December 2020 – via CORE. <a href="https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf" target="_blank">https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></p></li> <li id="fn:13"><p>Louthan, M. R. (2008-06-01). "Hydrogen Embrittlement of Metals: A Primer for the Failure Analyst". Journal of Failure Analysis and Prevention. 8 (3): 289–307. doi:10.1007/s11668-008-9133-x. ISSN 1864-1245. S2CID 51738408. <a href="https://doi.org/10.1007/s11668-008-9133-x" target="_blank">https://doi.org/10.1007/s11668-008-9133-x</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></p></li> <li id="fn:14"><p>Li, Hanyu; Niu, Ranming; Li, Wei; Lu, Hongzhou; Cairney, Julie; Chen, Yi-Sheng (September 2022). "Hydrogen in pipeline steels: Recent advances in characterization and embrittlement mitigation". Journal of Natural Gas Science and Engineering. 105: 104709. Bibcode:2022JNGSE.10504709L. doi:10.1016/j.jngse.2022.104709. S2CID 250713252. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></p></li> <li id="fn:15"><p>Bhadhesia, Harry. "Prevention of Hydrogen Embrittlement in Steels" (PDF). Phase Transformations & Complex Properties Research Group, Cambridge University. Retrieved 17 December 2020. <a href="https://www.phase-trans.msm.cam.ac.uk/2016/preventing_hydrogen.pdf" target="_blank">https://www.phase-trans.msm.cam.ac.uk/2016/preventing_hydrogen.pdf</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></p></li> <li id="fn:16"><p>Lynch, S. P. (2011-01-01), Raja, V. S.; Shoji, Tetsuo (eds.), "2 - Hydrogen embrittlement (HE) phenomena and mechanisms", Stress Corrosion Cracking, Woodhead Publishing Series in Metals and Surface Engineering, Woodhead Publishing, pp. 90–130, ISBN 978-1-84569-673-3, retrieved 2022-06-10 <a href="978-1-84569-673-3" target="_blank">978-1-84569-673-3</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></p></li> <li id="fn:17"><p>Lee, Jonathan A. (April 2016). "Hydrogen Embrittlement" (PDF). NASA. Archived from the original (PDF) on Feb 5, 2021. Retrieved 18 December 2020 – via CORE. <a href="https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf" target="_blank">https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></p></li> <li id="fn:18"><p>Louthan, M. R. (2008-06-01). "Hydrogen Embrittlement of Metals: A Primer for the Failure Analyst". Journal of Failure Analysis and Prevention. 8 (3): 289–307. doi:10.1007/s11668-008-9133-x. ISSN 1864-1245. S2CID 51738408. <a href="https://doi.org/10.1007/s11668-008-9133-x" target="_blank">https://doi.org/10.1007/s11668-008-9133-x</a> <a href="#fnref:18" class="footnote-back-ref">↩</a></p></li> <li id="fn:19"><p>TWI – The Welding Institute. "What is high temperature hydrogen attack (HTHA) / hot hydrogen attack?". TWI - The Welding Institute. Retrieved 16 December 2020. <a href="https://www.twi-global.com/technical-knowledge/faqs/what-is-high-temperature-hydrogen-attack-htha-hot-hydrogen-attack" target="_blank">https://www.twi-global.com/technical-knowledge/faqs/what-is-high-temperature-hydrogen-attack-htha-hot-hydrogen-attack</a> <a href="#fnref:19" class="footnote-back-ref">↩</a></p></li> <li id="fn:20"><p>Lynch, S. P. (2011-01-01), Raja, V. S.; Shoji, Tetsuo (eds.), "2 - Hydrogen embrittlement (HE) phenomena and mechanisms", Stress Corrosion Cracking, Woodhead Publishing Series in Metals and Surface Engineering, Woodhead Publishing, pp. 90–130, ISBN 978-1-84569-673-3, retrieved 2022-06-10 <a href="978-1-84569-673-3" target="_blank">978-1-84569-673-3</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></p></li> <li id="fn:21"><p>Barnoush, Afrooz. "Hydrogen embrittlement revisited by in situ electrochemical nanoindentations" (PDF). Archived from the original (PDF) on 2011-05-18. Retrieved 18 December 2020. <a href="https://web.archive.org/web/20110518222127/http://www.uni-saarland.de/fak8/wwm/research/phd_barnoush/hydrogen.pdf" target="_blank">https://web.archive.org/web/20110518222127/http://www.uni-saarland.de/fak8/wwm/research/phd_barnoush/hydrogen.pdf</a> <a href="#fnref:21" class="footnote-back-ref">↩</a></p></li> <li id="fn:22"><p>Robertson, Ian M.; Sofronis, P.; Nagao, A.; Martin, M. L.; Wang, S.; Gross, D. W.; Nygren, K. E. (2015). "Hydrogen Embrittlement Understood". Metallurgical and Materials Transactions A. 46A (6): 2323–2341. Bibcode:2015MMTA...46.2323R. doi:10.1007/s11661-015-2836-1. S2CID 136682331. <a href="https://doi.org/10.1007%2Fs11661-015-2836-1" target="_blank">https://doi.org/10.1007%2Fs11661-015-2836-1</a> <a href="#fnref:22" class="footnote-back-ref">↩</a></p></li> <li id="fn:23"><p>Robertson, Ian M.; Sofronis, P.; Nagao, A.; Martin, M. L.; Wang, S.; Gross, D. W.; Nygren, K. E. (2015). "Hydrogen Embrittlement Understood". Metallurgical and Materials Transactions A. 46A (6): 2323–2341. Bibcode:2015MMTA...46.2323R. doi:10.1007/s11661-015-2836-1. S2CID 136682331. <a href="https://doi.org/10.1007%2Fs11661-015-2836-1" target="_blank">https://doi.org/10.1007%2Fs11661-015-2836-1</a> <a href="#fnref:23" class="footnote-back-ref">↩</a></p></li> <li id="fn:24"><p>Robertson, Ian M.; Sofronis, P.; Nagao, A.; Martin, M. L.; Wang, S.; Gross, D. W.; Nygren, K. E. (2015). "Hydrogen Embrittlement Understood". Metallurgical and Materials Transactions A. 46A (6): 2323–2341. Bibcode:2015MMTA...46.2323R. doi:10.1007/s11661-015-2836-1. S2CID 136682331. <a href="https://doi.org/10.1007%2Fs11661-015-2836-1" target="_blank">https://doi.org/10.1007%2Fs11661-015-2836-1</a> <a href="#fnref:24" class="footnote-back-ref">↩</a></p></li> <li id="fn:25"><p>Bhadhesia, Harry. "Prevention of Hydrogen Embrittlement in Steels" (PDF). Phase Transformations & Complex Properties Research Group, Cambridge University. Retrieved 17 December 2020. <a href="https://www.phase-trans.msm.cam.ac.uk/2016/preventing_hydrogen.pdf" target="_blank">https://www.phase-trans.msm.cam.ac.uk/2016/preventing_hydrogen.pdf</a> <a href="#fnref:25" class="footnote-back-ref">↩</a></p></li> <li id="fn:26"><p>Haiyang Yu (February 2009). "Discrete dislocation plasticity HELPs understand hydrogen effects in bcc materials". Journal of the Mechanics and Physics of Solids. 123: 41–60. arXiv:1807.05101. doi:10.1016/j.jmps.2018.08.020. S2CID 56081700. <a href="https://doi.org/10.1016%2Fj.jmps.2018.08.020" target="_blank">https://doi.org/10.1016%2Fj.jmps.2018.08.020</a> <a href="#fnref:26" class="footnote-back-ref">↩</a></p></li> <li id="fn:27"><p>Vergani, Laura; Colombo, Chiara; et al. (2014). "Hydrogen effect on fatigue behavior of a quenched and tempered steel". Procedia Engineering. 74 (XVII International Colloquium on Mechanical Fatigue of Metals (ICMFM17)): 468–71. doi:10.1016/j.proeng.2014.06.299. <a href="https://doi.org/10.1016%2Fj.proeng.2014.06.299" target="_blank">https://doi.org/10.1016%2Fj.proeng.2014.06.299</a> <a href="#fnref:27" class="footnote-back-ref">↩</a></p></li> <li id="fn:28"><p>Haiyang Yu (February 2009). "Discrete dislocation plasticity HELPs understand hydrogen effects in bcc materials". Journal of the Mechanics and Physics of Solids. 123: 41–60. arXiv:1807.05101. doi:10.1016/j.jmps.2018.08.020. S2CID 56081700. <a href="https://doi.org/10.1016%2Fj.jmps.2018.08.020" target="_blank">https://doi.org/10.1016%2Fj.jmps.2018.08.020</a> <a href="#fnref:28" class="footnote-back-ref">↩</a></p></li> <li id="fn:29"><p>Barnoush, Afrooz. "Hydrogen embrittlement revisited by in situ electrochemical nanoindentations" (PDF). Archived from the original (PDF) on 2011-05-18. Retrieved 18 December 2020. <a href="https://web.archive.org/web/20110518222127/http://www.uni-saarland.de/fak8/wwm/research/phd_barnoush/hydrogen.pdf" target="_blank">https://web.archive.org/web/20110518222127/http://www.uni-saarland.de/fak8/wwm/research/phd_barnoush/hydrogen.pdf</a> <a href="#fnref:29" class="footnote-back-ref">↩</a></p></li> <li id="fn:30"><p>Song, Jun (11 November 2012). "Atomic mechanism and prediction of hydrogen embrittlement in iro". Nature Materials. 12 (2): 145–151. doi:10.1038/nmat3479. PMID 23142843. Retrieved 22 December 2020. <a href="https://www.nature.com/articles/nmat3479" target="_blank">https://www.nature.com/articles/nmat3479</a> <a href="#fnref:30" class="footnote-back-ref">↩</a></p></li> <li id="fn:31"><p>Barnoush, Afrooz. "Hydrogen embrittlement revisited by in situ electrochemical nanoindentations" (PDF). Archived from the original (PDF) on 2011-05-18. Retrieved 18 December 2020. <a href="https://web.archive.org/web/20110518222127/http://www.uni-saarland.de/fak8/wwm/research/phd_barnoush/hydrogen.pdf" target="_blank">https://web.archive.org/web/20110518222127/http://www.uni-saarland.de/fak8/wwm/research/phd_barnoush/hydrogen.pdf</a> <a href="#fnref:31" class="footnote-back-ref">↩</a></p></li> <li id="fn:32"><p>Dolan, Michael D.; Kochanek, Mark A.; Munnings, Christopher N.; McLennan, Keith G.; Viano, David M. (February 2015). "Hydride phase equilibria in V–Ti–Ni alloy membranes". Journal of Alloys and Compounds. 622: 276–281. doi:10.1016/j.jallcom.2014.10.081. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:32" class="footnote-back-ref">↩</a></p></li> <li id="fn:33"><p>Djukic, M.B.; et al. (2014). "Hydrogen embrittlement of low carbon structural steel". Procedia Materials Science. 3 (20th European Conference on Fracture): 1167–1172. doi:10.1016/j.mspro.2014.06.190. <a href="https://doi.org/10.1016%2Fj.mspro.2014.06.190" target="_blank">https://doi.org/10.1016%2Fj.mspro.2014.06.190</a> <a href="#fnref:33" class="footnote-back-ref">↩</a></p></li> <li id="fn:34"><p>Djukic, M.B.; et al. (2015). "Hydrogen damage of steels: A case study and hydrogen embrittlement model". Engineering Failure Analysis. 58 (Recent case studies in Engineering Failure Analysis): 485–498. doi:10.1016/j.engfailanal.2015.05.017. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:34" class="footnote-back-ref">↩</a></p></li> <li id="fn:35"><p>Ambat, Rajan; Dwarakadasa (February 1996). "Effect of Hydrogen in aluminium and aluminium alloys: A review". Bulletin of Materials Science. 19 (1): 103–114. doi:10.1007/BF02744792. <a href="https://doi.org/10.1007%2FBF02744792" target="_blank">https://doi.org/10.1007%2FBF02744792</a> <a href="#fnref:35" class="footnote-back-ref">↩</a></p></li> <li id="fn:36"><p>Eberhart, Mark (2003). Why Things Break. New York: Harmony Books. p. 65. ISBN 978-1-4000-4760-4. <a href="978-1-4000-4760-4" target="_blank">978-1-4000-4760-4</a> <a href="#fnref:36" class="footnote-back-ref">↩</a></p></li> <li id="fn:37"><p>Tartaglia, John; Lazzari, Kristen; et al. (March 2008). "A Comparison of Mechanical Properties and Hydrogen Embrittlement Resistance of Austempered vs Quenched and Tempered 4340 Steel". Metallurgical and Materials Transactions A. 39 (3): 559–76. Bibcode:2008MMTA...39..559T. doi:10.1007/s11661-007-9451-8. ISSN 1073-5623. S2CID 136866718. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:37" class="footnote-back-ref">↩</a></p></li> <li id="fn:38"><p>Lee, Jonathan A. (April 2016). "Hydrogen Embrittlement" (PDF). NASA. Archived from the original (PDF) on Feb 5, 2021. Retrieved 18 December 2020 – via CORE. <a href="https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf" target="_blank">https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf</a> <a href="#fnref:38" class="footnote-back-ref">↩</a></p></li> <li id="fn:39"><p>Marchi, C. San (2012). "Technical Reference for Hydrogen Compatibility of Materials" (PDF). <a href="https://www.sandia.gov/app/uploads/sites/158/2021/12/SAND2012_7321.pdf" target="_blank">https://www.sandia.gov/app/uploads/sites/158/2021/12/SAND2012_7321.pdf</a> <a href="#fnref:39" class="footnote-back-ref">↩</a></p></li> <li id="fn:40"><p>Lee, Jonathan A. (April 2016). "Hydrogen Embrittlement" (PDF). NASA. Archived from the original (PDF) on Feb 5, 2021. Retrieved 18 December 2020 – via CORE. <a href="https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf" target="_blank">https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf</a> <a href="#fnref:40" class="footnote-back-ref">↩</a></p></li> <li id="fn:41"><p>Fracture Mechanics Techniques for Assessing the Effects of Hydrogen on Steel PropertiesM J Cheaitani and R J Pargeter, TWI, paper presented at the International Steel and Hydrogen Conference 28 September 2011. <a href="https://www.twi-global.com/technical-knowledge/published-papers/fracture-mechanics-techniques-for-assessing-the-effects-of-hydrogen-on-steel-properties" target="_blank">https://www.twi-global.com/technical-knowledge/published-papers/fracture-mechanics-techniques-for-assessing-the-effects-of-hydrogen-on-steel-properties</a> <a href="#fnref:41" class="footnote-back-ref">↩</a></p></li> <li id="fn:42"><p>Dolan, Michael D.; Kochanek, Mark A.; Munnings, Christopher N.; McLennan, Keith G.; Viano, David M. (February 2015). "Hydride phase equilibria in V–Ti–Ni alloy membranes". Journal of Alloys and Compounds. 622: 276–281. doi:10.1016/j.jallcom.2014.10.081. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:42" class="footnote-back-ref">↩</a></p></li> <li id="fn:43"><p>Fernandez-Sousa, Rebeca (2020). "Analysis of the influence of microstructural traps on hydrogen assisted fatigue". Acta Materialia. 199: 253. arXiv:2008.05452. Bibcode:2020AcMat.199..253F. doi:10.1016/j.actamat.2020.08.030. S2CID 221103811. <a href="/wiki/ArXiv_(identifier)" target="_blank">/wiki/ArXiv_(identifier)</a> <a href="#fnref:43" class="footnote-back-ref">↩</a></p></li> <li id="fn:44"><p>Vergani, Laura; Colombo, Chiara; et al. (2014). "Hydrogen effect on fatigue behavior of a quenched and tempered steel". Procedia Engineering. 74 (XVII International Colloquium on Mechanical Fatigue of Metals (ICMFM17)): 468–71. doi:10.1016/j.proeng.2014.06.299. <a href="https://doi.org/10.1016%2Fj.proeng.2014.06.299" target="_blank">https://doi.org/10.1016%2Fj.proeng.2014.06.299</a> <a href="#fnref:44" class="footnote-back-ref">↩</a></p></li> <li id="fn:45"><p>Lee, Jonathan A. (April 2016). "Hydrogen Embrittlement" (PDF). NASA. Archived from the original (PDF) on Feb 5, 2021. Retrieved 18 December 2020 – via CORE. <a href="https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf" target="_blank">https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf</a> <a href="#fnref:45" class="footnote-back-ref">↩</a></p></li> <li id="fn:46"><p>Marchi, C. San (2012). "Technical Reference for Hydrogen Compatibility of Materials" (PDF). <a href="https://www.sandia.gov/app/uploads/sites/158/2021/12/SAND2012_7321.pdf" target="_blank">https://www.sandia.gov/app/uploads/sites/158/2021/12/SAND2012_7321.pdf</a> <a href="#fnref:46" class="footnote-back-ref">↩</a></p></li> <li id="fn:47"><p>Lee, Jonathan A. (April 2016). "Hydrogen Embrittlement" (PDF). NASA. Archived from the original (PDF) on Feb 5, 2021. Retrieved 18 December 2020 – via CORE. <a href="https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf" target="_blank">https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf</a> <a href="#fnref:47" class="footnote-back-ref">↩</a></p></li> <li id="fn:48"><p>Marchi, C. San (2012). "Technical Reference for Hydrogen Compatibility of Materials" (PDF). <a href="https://www.sandia.gov/app/uploads/sites/158/2021/12/SAND2012_7321.pdf" target="_blank">https://www.sandia.gov/app/uploads/sites/158/2021/12/SAND2012_7321.pdf</a> <a href="#fnref:48" class="footnote-back-ref">↩</a></p></li> <li id="fn:49"><p>Marchi, C. San (2012). "Technical Reference for Hydrogen Compatibility of Materials" (PDF). <a href="https://www.sandia.gov/app/uploads/sites/158/2021/12/SAND2012_7321.pdf" target="_blank">https://www.sandia.gov/app/uploads/sites/158/2021/12/SAND2012_7321.pdf</a> <a href="#fnref:49" class="footnote-back-ref">↩</a></p></li> <li id="fn:50"><p>Marchi, C. San (2012). "Technical Reference for Hydrogen Compatibility of Materials" (PDF). <a href="https://www.sandia.gov/app/uploads/sites/158/2021/12/SAND2012_7321.pdf" target="_blank">https://www.sandia.gov/app/uploads/sites/158/2021/12/SAND2012_7321.pdf</a> <a href="#fnref:50" class="footnote-back-ref">↩</a></p></li> <li id="fn:51"><p>Lee, Jonathan A. (April 2016). "Hydrogen Embrittlement" (PDF). NASA. Archived from the original (PDF) on Feb 5, 2021. Retrieved 18 December 2020 – via CORE. <a href="https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf" target="_blank">https://web.archive.org/web/20210205082611/https://core.ac.uk/download/pdf/84914440.pdf</a> <a href="#fnref:51" class="footnote-back-ref">↩</a></p></li> <li id="fn:52"><p>Francis, Rob (November 2018). "A Failure Analysis of Hydrogen Embrittlement in Bridge Fasteners". Corrosionpedia. Retrieved 18 December 2020. <a href="https://www.corrosionpedia.com/a-failure-analysis-of-hydrogen-embrittlement-in-bridge-fasteners/2/6877" target="_blank">https://www.corrosionpedia.com/a-failure-analysis-of-hydrogen-embrittlement-in-bridge-fasteners/2/6877</a> <a href="#fnref:52" class="footnote-back-ref">↩</a></p></li> <li id="fn:53"><p>Ferraz, M. Teresa; Oliveira, Manuela (2008). "Steel fasteners failure by hydrogen embrittlement" (PDF). Ciência e Tecnologia dos Materiais. 20 (1/2): 128–133. Retrieved 18 December 2020. <a href="http://www.scielo.mec.pt/pdf/ctm/v20n1-2/20n1-2a19.pdf" target="_blank">http://www.scielo.mec.pt/pdf/ctm/v20n1-2/20n1-2a19.pdf</a> <a href="#fnref:53" class="footnote-back-ref">↩</a></p></li> <li id="fn:54"><p>Yun Chung (2 December 2014). "Validity of Caltrans' Environmental Hydrogen Embrittlement Test on Grade BD Anchor Rods in the SAS Span" (PDF). <a href="http://www.sacbee.com/news/investigations/bay-bridge/article4254712.ece/BINARY/Validity%20of%20Caltrans%27%20EHE%20Tests.pdf" target="_blank">http://www.sacbee.com/news/investigations/bay-bridge/article4254712.ece/BINARY/Validity%20of%20Caltrans%27%20EHE%20Tests.pdf</a> <a href="#fnref:54" class="footnote-back-ref">↩</a></p></li> <li id="fn:55"><p>Eberhart, Mark (2003). Why Things Break. New York: Harmony Books. p. 65. ISBN 978-1-4000-4760-4. <a href="978-1-4000-4760-4" target="_blank">978-1-4000-4760-4</a> <a href="#fnref:55" class="footnote-back-ref">↩</a></p></li> <li id="fn:56"><p>Weman, Klas (2011). Welding Processes Handbook. Elsevier. p. 115. ISBN 978-0-85709-518-3. <a href="978-0-85709-518-3" target="_blank">978-0-85709-518-3</a> <a href="#fnref:56" class="footnote-back-ref">↩</a></p></li> <li id="fn:57"><p>"Standard Test Method for Process Control Verification to Prevent Hydrogen Embrittlement in Plated or Coated Fasteners". Astm.org. Retrieved 24 February 2015. <a href="http://www.astm.org/cgi-bin/SoftCart.exe/DATABASE.CART/REDLINE_PAGES/F1940.htm?L+mystore+yvst4574+1196145312" target="_blank">http://www.astm.org/cgi-bin/SoftCart.exe/DATABASE.CART/REDLINE_PAGES/F1940.htm?L+mystore+yvst4574+1196145312</a> <a href="#fnref:57" class="footnote-back-ref">↩</a></p></li> <li id="fn:58"><p>Ferraz, M. Teresa; Oliveira, Manuela (2008). "Steel fasteners failure by hydrogen embrittlement" (PDF). Ciência e Tecnologia dos Materiais. 20 (1/2): 128–133. Retrieved 18 December 2020. <a href="http://www.scielo.mec.pt/pdf/ctm/v20n1-2/20n1-2a19.pdf" target="_blank">http://www.scielo.mec.pt/pdf/ctm/v20n1-2/20n1-2a19.pdf</a> <a href="#fnref:58" class="footnote-back-ref">↩</a></p></li> <li id="fn:59"><p>Federal Engineering and Design Support. "Embrittlement" (PDF). Fastenal. Fastenal Company Engineering Department. Retrieved 9 May 2015. <a href="http://www.fastenal.com/content/feds/pdf/Article%20-%20Embrittlement.pdf" target="_blank">http://www.fastenal.com/content/feds/pdf/Article%20-%20Embrittlement.pdf</a> <a href="#fnref:59" class="footnote-back-ref">↩</a></p></li> <li id="fn:60"><p>Marchi, C. San (2012). "Technical Reference for Hydrogen Compatibility of Materials" (PDF). <a href="https://www.sandia.gov/app/uploads/sites/158/2021/12/SAND2012_7321.pdf" target="_blank">https://www.sandia.gov/app/uploads/sites/158/2021/12/SAND2012_7321.pdf</a> <a href="#fnref:60" class="footnote-back-ref">↩</a></p></li> <li id="fn:61"><p>"Addressing hydrogen permeation and embrittlement". 2023. <a href="https://zircotec.com/resources/news/addressing-hydrogen-permeation-and-embrittlement/" target="_blank">https://zircotec.com/resources/news/addressing-hydrogen-permeation-and-embrittlement/</a> <a href="#fnref:61" class="footnote-back-ref">↩</a></p></li> <li id="fn:62"><p>"ASTM F1459 - 06(2012): Standard Test Method for Determination of the Susceptibility of Metallic Materials to Hydrogen Gas Embrittlement (HGE)". Astm.org. Retrieved 2015-02-24. <a href="http://www.astm.org/Standards/F1459.htm" target="_blank">http://www.astm.org/Standards/F1459.htm</a> <a href="#fnref:62" class="footnote-back-ref">↩</a></p></li> <li id="fn:63"><p>"ASTM G142 - 98(2011) Standard Test Method for Determination of Susceptibility of Metals to Embrittlement in Hydrogen Containing Environments at High Pressure, High Temperature, or Both". Astm.org. Retrieved 2015-02-24. <a href="http://www.astm.org/Standards/G142.htm" target="_blank">http://www.astm.org/Standards/G142.htm</a> <a href="#fnref:63" class="footnote-back-ref">↩</a></p></li> <li id="fn:64"><p>ASTM STP 543, "Hydrogen Embrittlement Testing" <a href="#fnref:64" class="footnote-back-ref">↩</a></p></li> <li id="fn:65"><p>Raymond L (1974). Hydrogen Embrittlement Testing. ASTM International. ISBN 978-0-8031-0373-3. <a href="978-0-8031-0373-3" target="_blank">978-0-8031-0373-3</a> <a href="#fnref:65" class="footnote-back-ref">↩</a></p></li> <li id="fn:66"><p>"ASTM F1940 - 07a(2014) Standard Test Method for Process Control Verification to Prevent Hydrogen Embrittlement in Plated or Coated Fasteners". Astm.org. Retrieved 2015-02-24. <a href="http://www.astm.org/Standards/F1940.htm" target="_blank">http://www.astm.org/Standards/F1940.htm</a> <a href="#fnref:66" class="footnote-back-ref">↩</a></p></li> <li id="fn:67"><p>"ASTM F519 - 17a Standard Test Method for Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments". www.astm.org. Retrieved 21 April 2018. <a href="http://www.astm.org/Standards/F519.htm" target="_blank">http://www.astm.org/Standards/F519.htm</a> <a href="#fnref:67" class="footnote-back-ref">↩</a></p></li> <li id="fn:68"><p>Yun Chung (2 December 2014). "Validity of Caltrans' Environmental Hydrogen Embrittlement Test on Grade BD Anchor Rods in the SAS Span" (PDF). <a href="http://www.sacbee.com/news/investigations/bay-bridge/article4254712.ece/BINARY/Validity%20of%20Caltrans%27%20EHE%20Tests.pdf" target="_blank">http://www.sacbee.com/news/investigations/bay-bridge/article4254712.ece/BINARY/Validity%20of%20Caltrans%27%20EHE%20Tests.pdf</a> <a href="#fnref:68" class="footnote-back-ref">↩</a></p></li> <li id="fn:69"><p>Francis, Rob (November 2018). "A Failure Analysis of Hydrogen Embrittlement in Bridge Fasteners". Corrosionpedia. Retrieved 18 December 2020. <a href="https://www.corrosionpedia.com/a-failure-analysis-of-hydrogen-embrittlement-in-bridge-fasteners/2/6877" target="_blank">https://www.corrosionpedia.com/a-failure-analysis-of-hydrogen-embrittlement-in-bridge-fasteners/2/6877</a> <a href="#fnref:69" class="footnote-back-ref">↩</a></p></li> <li id="fn:70"><p>Mair, Lucy (14 January 2015). "British Land to replace 'a number of bolts' on Leadenhall Building". constructionnews.co.uk. Retrieved 21 April 2018. <a href="https://www.constructionnews.co.uk/news/contractors-news/third-bolt-breaks-on-cheesegrater-14-01-2015/" target="_blank">https://www.constructionnews.co.uk/news/contractors-news/third-bolt-breaks-on-cheesegrater-14-01-2015/</a> <a href="#fnref:70" class="footnote-back-ref">↩</a></p></li> <li id="fn:71"><p>"Cheesegrater bolts to cost Severfield £6m after Leadenhall building loses five". cityam. 17 June 2015. Retrieved 22 December 2020. <a href="https://www.cityam.com/cheesegrater-bolts-cost-severfield-6m/" target="_blank">https://www.cityam.com/cheesegrater-bolts-cost-severfield-6m/</a> <a href="#fnref:71" class="footnote-back-ref">↩</a></p></li> </ol>