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Journal articles on the topic 'Hydrogen embrittlement of materials'

Author: Grafiati

Published: 19 February 2023

Last updated: 20 February 2023

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1

Su, Jian-Qing, Shu-Jun Gao, and Zhuang-Qi Hu. "Hydrogen embrittlement of B-doped Ni3Al-based alloy." Journal of Materials Research 13, no. 11 (1998): 3052–59. http://dx.doi.org/10.1557/jmr.1998.0417.

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Environmental and internal-hydrogen embrittlements in stress-relieved and recrystallized Ni−16.5Al−8Cr−0.8Hf−0.1B−0.03Y (at. %) have been studied. The stress-relieved Ni3Al-based alloy showed environmental embrittlement when tested in air or in hydrogen gas. The embrittlement is more severe in hydrogen gas than that in air. The recrystallized Ni3Al-based alloy was not susceptible to air, but it was embrittled severely by hydrogen gas and exhibited not only a grain interior but a severer grain boundary embrittlement. When tested in air, the stress-relieved Ni3Al was insensitive to internal hydr

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2

Bhat, Nidhi, Chitra Agrawal, and Ujwal Shreenag Meda. "Hydrogen Impermeable Materials for Efficient Hydrogen Storage." ECS Transactions 107, no. 1 (2022): 4875–83. http://dx.doi.org/10.1149/10701.4875ecst.

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Hydrogen has the most potential as an energy resource alternative to fossil fuels, with numerous applications across sectors. It is clean and is present in a great amount in nature. However, due to the challenges in handling hydrogen and hydrogen embrittlement, its storage remains a concern, which is why high strength steels are rarely employed for such applications. To improve these hydrogen storage systems and address issues such as low energy efficiency, weight, long refueling periods, durability, hydrogen embrittlement, and costs, better hydrogen impermeable materials must be created. Ther

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3

Yin, Ruifeng, Ruidong Fu, Ningning Gu, and Yongjiu Liu. "A Study of Hydrogen Embrittlement of SA-372 J Class High Pressure Hydrogen Storage Seamless Cylinder (≥100 MPA)." Materials 15, no. 21 (2022): 7714. http://dx.doi.org/10.3390/ma15217714.

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The spinning process will lead to changes in the micro-structure and mechanical properties of the materials in different positions of the high-pressure hydrogen storage cylinder, which will show different hydrogen embrittlement resistance in the high-pressure hydrogen environment. In order to fully study the safety of hydrogen storage in large-volume seamless steel cylinders, this chapter associates the influence of the forming process with the deterioration of a high-pressure hydrogen cylinder (≥100 MPa). The anti-hydrogen embrittlement of SA-372 grade J steel at different locations of the fo

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4

Murakami, Yukitaka, Toshihiko Kanezaki, and Yoji Mine. "Hydrogen Effect against Hydrogen Embrittlement." Metallurgical and Materials Transactions A 41, no. 10 (2010): 2548–62. http://dx.doi.org/10.1007/s11661-010-0275-6.

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5

Jayalakshmi, S., Ki Bae Kim, Young Whan Cho, and Eric Fleury. "Ti-Based Amorphous Alloys and Composites as Potential Candidate Materials for Energy Applications." Solid State Phenomena 124-126 (June 2007): 915–18. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.915.

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The hydrogenation characteristics and embrittlement behavior of Ti50Zr(50-x)Cux alloys (x=25,33,40) are reported. The hydrogenation kinetics decreased with increasing Zr-content. Though the Ti50Zr25Cu25 alloy showed the slowest kinetics, it absorbed large amount of hydrogen (~2.4 wt.%) and exhibited the best resistance against hydrogen embrittlement. The excellent characteristics of Ti- Zr-Cu alloys in hydrogen environment indicated that they are promising materials in future for energy applications.

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6

Li, Lingxiao, Jiyan Liu, Yuhao Wang, Guozhu Zhang, and Fengshan Du. "Study on the Effect of Microstructure Gradients Caused by Heat Gradients on Hydrogen Embrittlement Sensitivity in Heavy Forgings." Metals 12, no. 4 (2022): 610. http://dx.doi.org/10.3390/met12040610.

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The hydrogen embrittlement problem of alloy steel heavy forgings not only has the common properties of general hydrogen embrittlement, but also has the characteristics brought by its scale characteristics. The research of hydrogen embrittlement, combined with its characteristics and commonness, is of vital importance for the service safety of engineering structures. The temperature field and microstructure distribution in the machining process were investigated through the simulation of a finite element. On this basis, the physical simulation experiments were carried out to obtain the microstr

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7

Yamamoto, Seigoro. "Hydrogen Embrittlement of Nuclear Power Plant Materials." MATERIALS TRANSACTIONS 45, no. 8 (2004): 2647–49. http://dx.doi.org/10.2320/matertrans.45.2647.

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8

Dwivedi, Sandeep Kumar, and Manish Vishwakarma. "Hydrogen embrittlement in different materials: A review." International Journal of Hydrogen Energy 43, no. 46 (2018): 21603–16. http://dx.doi.org/10.1016/j.ijhydene.2018.09.201.

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9

Pryadko, T. V., V. A. Dekhtyarenko, V. I. Bondarchuk, M. A. Vasilyev, and S. M. Voloshko. "Complex Approach to Protecting Titanium Constructions from Hydrogen Embrittlement." METALLOFIZIKA I NOVEISHIE TEKHNOLOGII 42, no. 10 (2020): 1419–29. http://dx.doi.org/10.15407/mfint.42.10.1419.

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10

Akiyama, Eiji. "Hydrogen Embrittlement of Metallic Materials and Recent Subjects." Materia Japan 56, no. 3 (2017): 230–33. http://dx.doi.org/10.2320/materia.56.230.

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11

Ayas, C., N. A. Fleck, and V. S. Deshpande. "Hydrogen embrittlement of a bimaterial." Mechanics of Materials 80 (January 2015): 193–202. http://dx.doi.org/10.1016/j.mechmat.2014.06.002.

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12

Zhang, Fan, Zeen Wu, Tiebang Zhang, Rui Hu, and Xiaoye Wang. "Microstructure Sensitivity on Environmental Embrittlement of a High Nb Containing TiAl Alloy under Different Atmospheres." Materials 15, no. 23 (2022): 8508. http://dx.doi.org/10.3390/ma15238508.

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Mechanical properties in different atmospheres, including oxygen, vacuum, air and H2, of high Nb containing TiAl alloys with the compositions of Ti–45Al–8.5Nb–(0.2W, 0.2B, 0.02Y) have been investigated in this work. Three different microstructure types, nearly lamellar, gamma phase increased nearly lamellar and fully lamellar are selected for revealing the microstructure sensitivity of environmental embrittlement. The results show that the three types of microstructures are all affected by the hydrogen–induced environmental embrittlement. Although the fracture mode of the experimental alloy is

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13

Reddy, K. G., S. Arumugam, and T. S. Lakshmanan. "Hydrogen embrittlement of maraging steel." Journal of Materials Science 27, no. 19 (1992): 5159–62. http://dx.doi.org/10.1007/bf02403810.

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14

Nishimura, Rokuro. "Hydrogen Embrittlement of Metallic Materials in Corrosive Environments." Zairyo-to-Kankyo 62, no. 11 (2013): 410–15. http://dx.doi.org/10.3323/jcorr.62.410.

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15

Eliezer, Dan, and Ravit Silverstein. "Recent Studies of Hydrogen Embrittlement in Structural Materials." Procedia Structural Integrity 13 (2018): 2233–38. http://dx.doi.org/10.1016/j.prostr.2018.12.135.

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16

Dadfarnia, Mohsen, Akihide Nagao, Shuai Wang, May L. Martin, Brian P. Somerday, and Petros Sofronis. "Recent advances on hydrogen embrittlement of structural materials." International Journal of Fracture 196, no. 1-2 (2015): 223–43. http://dx.doi.org/10.1007/s10704-015-0068-4.

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17

Trautmann, Anton, Gregor Mori, Markus Oberndorfer, Stephan Bauer, Christoph Holzer, and Christoph Dittmann. "Hydrogen Uptake and Embrittlement of Carbon Steels in Various Environments." Materials 13, no. 16 (2020): 3604. http://dx.doi.org/10.3390/ma13163604.

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To avoid failures due to hydrogen embrittlement, it is important to know the amount of hydrogen absorbed by certain steel grades under service conditions. When a critical hydrogen content is reached, the material properties begin to deteriorate. The hydrogen uptake and embrittlement of three different carbon steels (API 5CT L80 Type 1, P110 and 42CrMo4) was investigated in autoclave tests with hydrogen gas (H2) at elevated pressure and in ambient pressure tests with hydrogen sulfide (H2S). H2 gas with a pressure of up to 100 bar resulted in an overall low but still detectable hydrogen absorpti

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18

Kasul, David B., and Lloyd A. Heldt. "Environmental Effects on the Cracking of Engineering Materials." MRS Bulletin 14, no. 8 (1989): 37–43. http://dx.doi.org/10.1557/s0883769400061947.

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A material's susceptibility to cracking may be significantly affected by its chemical environment. Stress corrosion cracking (SCC), liquid metal embrittle-ment (LME), hydrogen embrittlement (HE), and corrosion fatigue are examples of environmental effects which cause ductility or endurance losses through environment-assisted cracking (EAC). Under certain conditions, virtually all commercially important materials are susceptible to one or more of the above embrittlement processes. Cracking may occur intergranularly, transgranularly, or in a mixed mode, depending on conditions. Much is known abo

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19

Qu, Feng, An, et al. "Hydrogen-Assisted Crack Growth in the Heat-Affected Zone of X80 Steels during in Situ Hydrogen Charging." Materials 12, no. 16 (2019): 2575. http://dx.doi.org/10.3390/ma12162575.

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Herein, the hydrogen embrittlement of a heat-affected zone (HAZ) was examined using slow strain rate tension in situ hydrogen charging. The influence of hydrogen on the crack path of the HAZ sample surfaces was determined using electron back scatter diffraction analysis. The hydrogen embrittlement susceptibility of the base metal and the HAZ samples increased with increasing current density. The HAZ samples have lower resistance to hydrogen embrittlement than the base metal samples in the same current density. Brittle circumferential cracks located at the HAZ sample surfaces were perpendicular

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20

Alexander Stopher, Miles, and Pedro E. J. Rivera-Diaz-del-Castillo. "Hydrogen embrittlement in bearing steels." Materials Science and Technology 32, no. 11 (2016): 1184–93. http://dx.doi.org/10.1080/02670836.2016.1156810.

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21

Yan, Yingjie, Yukun Zhang, Lixian Zhao, et al. "Effect of Applied Tensile Stress on Hydrogen-Induced Delayed Fracture Mode of Fe-Ni-Cr Austenitic Alloy Weldment." Metals 12, no. 10 (2022): 1614. http://dx.doi.org/10.3390/met12101614.

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Fe-Ni-Cr austenitic alloys are widely used in hydrogen environments as structural materials. Their weld normally shows higher hydrogen-embrittlement sensitivity than the base metal, endangering large-scale applications. Herein, by using electron microscopy and numerical calculations, the influence of applied load on the fracture mode of hydrogen-embrittled JBK-75 alloy weldment is revealed and correlated with a competition between hydrogen-prompted intergranular decohesion (HPID) and hydrogen-enhanced localized plasticity (HELP). Therefore, independent of the load levels, the weld featuring a

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22

Watakabe, Takahito, Goroh Itoh, and Yuji Hatano. "Visualization of Diffusive Hydrogen." Materials Science Forum 654-656 (June 2010): 2903–6. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.2903.

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In recent years, the use of hydrogen as a clean energy has been paid attention to in terms of the prevention of global warming. Tanks composed solely of steel and cylinders consisting of aluminum liner reinforced with C-FRP in the surrounding are used to store high-pressure hydrogen gas in hydrogen stations and in fuel cell vehicles, respectively. On the other hand, hydrogen embrittlement has been known to occur in some metallic materials under several certain conditions. Also, it has been generally known that the environmental hydrogen that invades the material during services plays major rol

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23

Yu, Haiyang, Jim Stian Olsen, Antonio Alvaro, Lijie Qiao, Jianying He, and Zhiliang Zhang. "Hydrogen informed Gurson model for hydrogen embrittlement simulation." Engineering Fracture Mechanics 217 (August 2019): 106542. http://dx.doi.org/10.1016/j.engfracmech.2019.106542.

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24

Major, Š. "Hydrogen Embrittlement and its Effect on Fatigue Life of Nitrided Steel in Gigacycle Fatigue: Analysis and Modelling." Journal of Physics: Conference Series 2315, no. 1 (2022): 012025. http://dx.doi.org/10.1088/1742-6596/2315/1/012025.

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Abstract This paper deals with the effect of hydrogen embrittlement on the fatigue life of steels. This phenomenon is typical for the gigacycle fatigue region, but we also encounter it in surface-treated materials. in which a subsurface crack initiation has occurred. In samples in which the fracture is affected by the presence of hydrogen embrittlement, subsurface fatigue crack initiation occurs. In this work we observe the change in toughness and local elastic modulus depending on the hydrogen diffusion of hydrogen over time.

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25

Kushida, Takahiro, and Takeo Kudo. "Hydrogen Embrittlement is Steels from Viewpoints of Hydrogen Diffusion and Hydrogen Absorption." Materia Japan 33, no. 7 (1994): 932–39. http://dx.doi.org/10.2320/materia.33.932.

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26

Thiessen, R. G. "Hydrogen-related challenges for the steelmaker: the search for proper testing." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, no. 2098 (2017): 20160408. http://dx.doi.org/10.1098/rsta.2016.0408.

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The modern steelmaker of advanced high-strength steels has always been challenged with the conflicting targets of increased strength while maintaining or improving ductility. These new steels help the transportation sector, including the automotive sector, to achieve the goals of increased passenger safety and reduced emissions. With increasing tensile strengths, certain steels exhibit an increased sensitivity towards hydrogen embrittlement (HE). The ability to characterize the material's sensitivity in an as-delivered condition has been developed and accepted (SEP1970), but the complexity of

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27

Ko, Seok-Woo, Ji-Min Lee, and Byoungchul Hwang. "Effect of Nb addition and Pre-strain on Hydrogen Embrittlement of Low-carbon Steels with Ferrite-pearlite Structure." Korean Journal of Metals and Materials 58, no. 11 (2020): 752–58. http://dx.doi.org/10.3365/kjmm.2020.58.11.752.

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The effect of pre-strain on the hydrogen embrittlement of Nb-free and Nb-added low-carbon steels with ferrite-pearlite structure was investigated in this study. After the steels were electrochemically charged with hydrogen, slow-strain rate tensile (SSRT) tests were conducted on them to examine hydrogen embrittlement behavior. The SSRT test results revealed that the Nb-added steel had a lesser decrease of elongation and reduction of area than the Nb-free steel. The formation of NbC carbide and grain refinement caused by the Nb addition improved resistance to hydrogen embrittlement. The loss of

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28

Hojo, Tomohiko, Yuki Shibayama, Saya Ajito, Motomichi Koyama, and Eiji Akiyama. "Hydrogen Embrittlement of High-Strength Steel Sheets." Materia Japan 61, no. 7 (2022): 413–18. http://dx.doi.org/10.2320/materia.61.413.

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29

Nagumo, Michihiko. "Fundamental Aspects of Hydrogen Embrittlement of Iron." Materia Japan 33, no. 7 (1994): 914–21. http://dx.doi.org/10.2320/materia.33.914.

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30

Cho, Lawrence, Yuran Kong, John G. Speer, and Kip O. Findley. "Hydrogen Embrittlement of Medium Mn Steels." Metals 11, no. 2 (2021): 358. http://dx.doi.org/10.3390/met11020358.

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Recent research efforts to develop advanced–/ultrahigh–strength medium-Mn steels have led to the development of a variety of alloying concepts, thermo-mechanical processing routes, and microstructural variants for these steel grades. However, certain grades of advanced–/ultrahigh–strength steels (A/UHSS) are known to be highly susceptible to hydrogen embrittlement, due to their high strength levels. Hydrogen embrittlement characteristics of medium–Mn steels are less understood compared to other classes of A/UHSS, such as high Mn twinning–induced plasticity steel, because of the relatively shor

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31

Jayalakshmi, S., J. P. Ahn, K. B. Kim, and E. Fleury. "Hydrogen-induced amorphization and embrittlement resistance in Ti-based in situ composite with bcc-phase in an amorphous matrix." Journal of Materials Research 22, no. 2 (2007): 428–36. http://dx.doi.org/10.1557/jmr.2007.0045.

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We report the hydrogenation characteristics and mechanical properties of Ti50Zr25Cu25 in situ composite ribbons, composed of β-Ti crystalline phase dispersed in an amorphous matrix. Upon cathodic charging at room temperature, high hydrogen absorption up to ∼60 at.% (H/M = ∼1.2) is obtained. At such a high concentration, hydrogen-induced amorphization occurs. Mechanical tests conducted on the composite with varying hydrogen concentrations indicate that the Ti50Zr25Cu25 alloy is significantly resistant to hydrogen embrittlement when compared to conventional amorphous alloys. A possible mechanism

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32

Choi, Young-Hwan, Jung Hee Lee, Seok-Min Kim, et al. "Temperature-Dependent Hydrogen Embrittlement of Austenitic Stainless Steel on Phase Transformation." Metals 13, no. 1 (2022): 35. http://dx.doi.org/10.3390/met13010035.

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A critical issue that needs to be addressed for wider utilization of hydrogen as fuel is protection against hydrogen embrittlement during cryogenic storage as it weakens the microstructure bonding force of metals through hydrogen penetration. Austenitic stainless steel, which is usually used in cryogenic vessels and is well known for its high hydrogen resistance at room temperature, has also been reported to be vulnerable to hydrogen embrittlement under cryogenic temperatures. In addition, because large storage vessels are operated over a wide range of temperatures, material behavior at variou

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33

Priyadarshi, A., and R. Balasubramaniam. "On critical hydrogen concentration for hydrogen embrittlement of Fe3Al." Bulletin of Materials Science 24, no. 5 (2001): 559–62. http://dx.doi.org/10.1007/bf02706731.

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34

Yin, Ruifeng, Ruidong Fu, Wenlong Wei, Jianfu Gao, Yongjiu Liu, and Shuaitao Ge. "Elastic–Plastic Numerical Analysis of the Spinning Process of SA-372 Steel Used in High-Pressure Hydrogen Storage Cylinders (≥100 MPA)." Materials 16, no. 1 (2022): 275. http://dx.doi.org/10.3390/ma16010275.

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Elastic–plastic numerical analysis of the spinning process of SA-372 steel is used in high-pressure hydrogen storage to analyze high-pressure hydrogen storage cylinders with high precision and excellent hydrogen embrittlement resistance. The spinning process of SA-372 steel used to form such a cylinder with a pressure of 100 MPa is investigated through elastic–plastic finite element analysis. The variations in the stress, strain, pressure, temperature, and wall thickness during the spinning processes are comprehensively examined, and the optimized processing parameters are determined based on

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35

Chu, W. Y., J. X. Li, C. H. Huang, Y. B. Wang, and L. J. Qiao. "Hydrogen Embrittlement of Rail Steels." CORROSION 55, no. 9 (1999): 892–97. http://dx.doi.org/10.5006/1.3284046.

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36

Perrin, M., L. Gaillet, C. Tessier, and H. Idrissi. "Hydrogen embrittlement of prestressing cables." Corrosion Science 52, no. 6 (2010): 1915–26. http://dx.doi.org/10.1016/j.corsci.2010.02.041.

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37

Hojo, Tomohiko, Yutao Zhou, Junya Kobayashi, et al. "Effects of Thermomechanical Processing on Hydrogen Embrittlement Properties of UltraHigh-Strength TRIP-Aided Bainitic Ferrite Steels." Metals 12, no. 2 (2022): 269. http://dx.doi.org/10.3390/met12020269.

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The effects of thermomechanical processing on the microstructure and hydrogen embrittlement properties of ultrahigh-strength, low-alloy, transformation-induced plasticity (TRIP)-aided bainitic ferrite (TBF) steels were investigated to apply to automobile forging parts such as engine and drivetrain parts. The hydrogen embrittlement properties were evaluated by conducting conventional tensile tests after hydrogen charging and constant load four-point bending tests with hydrogen charging. The 0.4 mass%C-TBF steel achieved refinement of the microstructure, improved retained austenite characteristi

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38

Cai, S. W., Y. Zong, T. S. Hua, and R. G. Song. "Study on the inhibition of hydrogen embrittlement of 7050 aluminum alloy in humid air by MAO coating." Anti-Corrosion Methods and Materials 67, no. 4 (2020): 387–94. http://dx.doi.org/10.1108/acmm-12-2019-2237.

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Purpose This paper aims to verify the inhibition of the hydrogen permeation effect of the coating and to quantitatively and qualitatively characterize the coating-induced stress. Design/methodology/approach By means of slow strain rate tensile testing (SSRT) in humid air, thickness measurement, fracture morphology, cross-section morphology and surface morphology, hydrogen content measurements, flow stress difference method. Findings The results demonstrate that the mechanism of the inhibition of hydrogen embrittlement by the coating is mainly attributed to the repression of hydrogen permeation

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39

Kim, Jae-Yun, Seok-Woo Ko, and Byoungchul Hwang. "Effect of Microstructure on Strain Aging and Hydrogen Embrittlement Behavior of Bake Hardening Steels." Korean Journal of Metals and Materials 60, no. 11 (2022): 811–18. http://dx.doi.org/10.3365/kjmm.2022.60.11.811.

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The strain aging and hydrogen embrittlement behavior of two bake hardening (BH) steels with different microstructures were investigated in this study. The single-phase BH steel was composed of fully ferrite, while the dual-phase BH steel consisted of ferrite and 3 % martensite. The BH index and aging index (AI) of the two BH steels were measured to compare the effect of microstructure on strain aging behavior. As a small amount of martensite is present in the dual-phase BH steel, the BH index value of the dual-phase BH steel was higher than that of single-phase BH steel, and the AI showed a re

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40

Barrera, O., and A. C. F. Cocks. "Mesoscopic model of hydrogen embrittlement in particle strengthened materials." Philosophical Magazine 102, no. 8 (2021): 698–717. http://dx.doi.org/10.1080/14786435.2021.2012611.

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41

Vlasov, N. M., and O. I. Chelyapina. "Mechanisms of hydrogen embrittlement and fracture of nanocrystalline materials." Russian Metallurgy (Metally) 2017, no. 4 (2017): 245–49. http://dx.doi.org/10.1134/s0036029517040231.

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42

Hardie, D., J. Xu, E. A. Charles, and Y. Wei. "Hydrogen embrittlement of stainless steel overlay materials for hydrogenators." Corrosion Science 46, no. 12 (2004): 3089–100. http://dx.doi.org/10.1016/j.corsci.2004.03.017.

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43

Takasugi, T., and S. Hanada. "Environmental embrittlement of boron-doped Ni3(Al, Ti) single crystals at room temperature." Journal of Materials Research 8, no. 10 (1993): 2534–42. http://dx.doi.org/10.1557/jmr.1993.2534.

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Environmental embrittlement of L12-type Ni3(Al, Ti) single crystals doped with 0.05 mass % boron was investigated at room temperature as functions of environmental media and strain rate. Environmental embrittlement occurs in air, water, and hydrogen gas, and is also very sensitive to strain rate with a decrease of elongation with decreasing strain rate. Environmental embrittlement is little influenced by boron doping, indicating no strong interaction with hydrogen in lattice. In embrittled condition, tensile elongation and fracture stress are reduced, and fracture mode is primarily {001} crack

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44

Meng, Ling Dong, Qing Zhang, and Zhi Jie Liang. "The Experimental Study on Sensitivity of Hydrogen Embrittlement of 20Cr₂Ni₄A High-Strength Steel Cleaned by Ultrasonic and Deruster." Advanced Materials Research 291-294 (July 2011): 1136–40. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.1136.

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In order to test whether there is the change of mechanics performance cleaned by ultrasonic and deruster, the experiments on mechanics performance and sensitivity of hydrogen embrittlement have been conducted. During the experiments, 20Cr2Ni4A steel are selected as the materials, which endure the relatively great concussion load in the bad condition, and the gaps’ long-time permanence experiments and short-time tension and concussion experiments have been done. Through the compare of mechanics performances and the SEM analysis of tensile fracture surface of the samples, it can be proved that t

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45

Castens, Matthias, Stefanie Hoja, Holger Surm, Franz Hoffmann, Rainer Fechte-Heinen, and Matthias Steinbacher. "Hydrogen Absorption during Case Hardening of Steels EN20MnCr5 (SAE5120) and EN18CrNiMo7-6 (SAE4820)." Metals 12, no. 1 (2021): 6. http://dx.doi.org/10.3390/met12010006.

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Damages to case-hardened components are often associated with the phenomenon of hydrogen embrittlement due to their specific fracture pattern. In the present work, the effects of the case hardening process on the hydrogen content in the material were investigated and the effects of hydrogen on the mechanical properties were examined. In order to determine not only the influence of the heat treatment process but also the influence of the material, the case-hardening steels EN20MnCr5 (SAE5120) and EN18CrNiMo7-6 (SAE4820) with different degrees of purity were investigated. From the results it can

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46

Liu, Y., K. Y., J. H. Zhang, G. Lu, and Z. Q. Hu. "First-principles investigation on environmental embrittlement of TiAl." Journal of Materials Research 13, no. 2 (1998): 290–301. http://dx.doi.org/10.1557/jmr.1998.0040.

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To investigate the hydrogen embrittlement and Mn ductilization effects in TiAl, the electronic structures of pure, H-doped, Mn-doped, and Mn, H-codoped TiAl have been studied by the first-principles discrete variational Xa calculations. Local environmental total bond order (LTBO), which is developed for the description of the cohesive properties in a local atom environment involving impurities, should be regarded as a new microscopic criterion for embrittlement. The larger LTBO presents the stronger cohesion and the better ductility of the system. Our results show that H obviously decreases LT

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47

Peral, Luis Borja, Inés Fernández-Pariente, Chiara Colombo, Cristina Rodríguez, and Javier Belzunce. "The Positive Role of Nanometric Molybdenum–Vanadium Carbides in Mitigating Hydrogen Embrittlement in Structural Steels." Materials 14, no. 23 (2021): 7269. http://dx.doi.org/10.3390/ma14237269.

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The influence of hydrogen on the fracture toughness and fatigue crack propagation rate of two structural steel grades, with and without vanadium, was evaluated by means of tests performed on thermally precharged samples in a hydrogen reactor at 195 bar and 450 °C for 21 h. The degradation of the mechanical properties was directly correlated with the interaction between hydrogen atoms and the steel microstructure. A LECO DH603 hydrogen analyzer was used to study the activation energies of the different microstructural trapping sites, and also to study the hydrogen eggresion kinetics at room tem

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48

Khanchandani, Heena, Se-Ho Kim, Rama Srinivas Varanasi, TS Prithiv, Leigh T. Stephenson, and Baptiste Gault. "Hydrogen and deuterium charging of site-specific specimen for atom probe tomography." Open Research Europe 1 (October 14, 2021): 122. http://dx.doi.org/10.12688/openreseurope.14176.1.

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Hydrogen embrittlement can cause a dramatic deterioration of the mechanical properties of high-strength metallic materials. Despite decades of experimental and modelling studies, the exact underlying mechanisms behind hydrogen embrittlement remain elusive. To unlock understanding of the mechanism and thereby help mitigate the influence of hydrogen and the associated embrittlement, it is essential to examine the interactions of hydrogen with structural defects such as grain boundaries, dislocations and stacking faults. Atom probe tomography (APT) can, in principle, analyse hydrogen located spec

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49

Khanchandani, Heena, Se-Ho Kim, Rama Srinivas Varanasi, TS Prithiv, Leigh T. Stephenson, and Baptiste Gault. "Hydrogen and deuterium charging of site-specific specimen for atom probe tomography." Open Research Europe 1 (October 14, 2021): 122. http://dx.doi.org/10.12688/openreseurope.14176.1.

Full text

Abstract:

Hydrogen embrittlement can cause a dramatic deterioration of the mechanical properties of high-strength metallic materials. Despite decades of experimental and modelling studies, the exact underlying mechanisms behind hydrogen embrittlement remain elusive. To unlock understanding of the mechanism and thereby help mitigate the influence of hydrogen and the associated embrittlement, it is essential to examine the interactions of hydrogen with structural defects such as grain boundaries, dislocations and stacking faults. Atom probe tomography (APT) can, in principle, analyse hydrogen located spec

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50

Bhadeshia, Harshad Kumar Dharamshi Hansraj. "Prevention of Hydrogen Embrittlement in Steels." ISIJ International 56, no. 1 (2016): 24–36. http://dx.doi.org/10.2355/isijinternational.isijint-2015-430.

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