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Showing 1 to 20 of 84 for “"Hydrogen embrittlement"”.
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Hydrogen Embrittlement of Nickel
… were performed to determine the effects of hydrogen segregation at grain boundaries on intergranular fracture of charged nickel deformed in tension. Two modes of hydrogen segregation are investigated; lattice diffusion and dislocation transport of "Cottrell atmospheres" of hydrogen. The …
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Hydrogen Embrittlement in Niobium
Made available in DSpace on 2014-12-14T16:00:34Z (GMT). No. of bitstreams: 1 7803997.pdf: 3565703 bytes, checksum: ddb1ac27d35f87da6a53e3f4052e1f74 (MD5) Previous issue date: 1977
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Hydrogen embrittlement: an interfacial phenomenon
Hydrogen transport during a test and hydrogen segregation to twins, second phase particles and precipitation products prior to testing are shown to adversely effect the mechanical properties of metals. Hydrogen embrittlement processes in austenitic stainless steel, mild steel and aluminum occurred …
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Low Temperature Hydrogen Embrittlement in Niobium
Made available in DSpace on 2014-12-14T16:00:28Z (GMT). No. of bitstreams: 1 7524312.pdf: 6849199 bytes, checksum: ebb8b2c74299d704140065f27f6ecb68 (MD5) Previous issue date: 1975
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Low temperature hydrogen embrittlement in niobium
Submitted by Minhao Jiang (mjiang14@illinois.edu) on 2013-10-15T01:43:28Z No. of bitstreams: 1 1975_grossbeck.pdf: 4793625 bytes, checksum: 8c715c8dff8d89abf5d540ca50435e1d (MD5)
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Hydrogen embrittlement of Aluminum-Lithium alloys
… this work is to study the effects of dissolved hydrogen on the mechanical properties of aluminum-lithium alloys: 2090, 2091, and Weldalite 049, and to compare with the effects on aluminum-copper 2219 alloy. Prior to mechanical testing, aging studies were performed for 2090 and 2219 using …
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Computational modeling of hydrogen embrittlement of iron aluminides
… extrinsically more susceptible to environmental embrittlement than the base ternary alloy (FA186) under constant tensile loading condition. This may due to the effect of smaller grain sizes caused by alloy addition. To further investigate the grain boundary size effect as related to the …
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Hydrogen embrittlement of an Al-4.5Zn-2.5Mg alloy
… are interpreted as indicating that a hydrogen embrittlement mechanism is operative whereby hydrogen, generated by a corrosion reaction, embrittles the alloy. Activation energy determinations have been made for stress corrosion crack growth at the free corrosion potential, and the …
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Hydrogen embrittlement of selected nickel and iron-base superalloys
Made available in DSpace on 2011-05-07T14:12:15Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9114264.pdf: 8376451 bytes, checksum: 0a2e91e90f19192aa850c4cce03a90fe (MD5) Previous issue date: 1990
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Hydrogen embrittlement testing of austenitic stainless steels SUS 316 and 316L
The imminent emergence of the hydrogen fuel industry has resulted in an urgent mandate for very specific material testing. Although storage of pressurized hydrogen gas is both practical and attainable, demands for increasing storage pressures (currently around 70 MPa) continue to present unexpected …
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Hydrogen embrittlement testing of alloy 718 for oil and gas applications
Hydrogen embrittlement of Ni-base corrosion resistant alloys (CRAs) can occur in deep sea oil wells when components are exposed to hydrogen while under stress. The effects of microstructure on hydrogen embrittlement of precipitation hardened Ni-base CRAs, such as alloy 718, are not fully …
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The first high-strength bainitic steel designed for hydrogen embrittlement resistance
The phenomenon of hydrogen embrittlement in steel has been known for over 150 years. Hydrogen-resistant alloys have been developed to mitigate this effect and three types of alloys with optimised structures have been enhanced over the years: nickel alloys, stainless steels, and quenched and …
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Effect of surface hardening conditions on susceptibility of fasteners to hydrogen embrittlement
… hardness, and case depth on susceptibility to hydrogen embrittlement of case hardened steel fasteners. While case hardened fasteners have been studied previously, there are currently no processing guidelines supported by quantitative data for fastener standards. Through sustained load and …
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Hydrogen embrittlement resistance in advanced high strength: vanadium bearing and TRIP-assisted steels
… damage, these lead to failure especially when hydrogen enters the lattice and gets trapped in defects. It is desired to design advanced steels highly resistant to hydrogen embrittlement (HE), while preserving a balance between their superior strength and ductility. For this purpose, a new …
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The role of grain boundary character in hydrogen embrittlement of nickel-iron superalloys
Hydrogen embrittlement of engineering alloys is characterized by a loss of ductility and unpredictable failure. These failures affect numerous industries, including nuclear power, oil and gas exploration, and hydrogen transportation and storage. In face-centered cubic alloys, the resultant fracture …
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Hydrogen Transport and Hydrogen Embrittlement in Stainless Steels (Diffusion, Permeation, Solubility, Slow Crack Growth)
In order to understand the kinetics of gaseous hydrogen-induced slow crack growth (SCG) in metastable austenitic stainless steels, hydrogen permeation and/or cracking velocity were measured and compared for three types of stainless steels. These included austenitic, ferritic, and duplex …
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On mitigation of hydrogen embrittlement and theoretical modeling of hydrogen accelerated fatigue crack growth
Hydrogen embrittlement and fatigue are two modes of structural materials failure for which mechanistic understanding is still lacking. In addition, it has been found experimentally that concurrent cyclic loading and hydrogen gas exposure can lead to enhanced fatigue crack growth rates. This work …
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