Hydrogen-induced ductilization in a novel austenitic lightweight TWIP steel

The Effects of Electrochemical Hydrogen Charging on Charpy Impact Toughness and Dry Sliding Tribological Behavior of AISI 316H Stainless Steel

“…Thus, the calculated hydrogen embrittlement index for the currently studied material resulted in a negative value, i.e., HEI CVN = −14.98%. The negative value of the calculated hydrogen embrittlement index might not be so surprising since, in several other studies regarding the effect of hydrogen charging on the mechanical behavior of FCC-structured alloys, similar findings have already been reported about some enhancement of deformation properties by hydrogenation [38][39][40][41][42][43][44][45][46][47]. However, it should be noted that such behavior in relation to the enhancement of deformation properties by hydrogen charging has been typically observed in high-alloyed metallic systems, including mainly high entropy alloys with an FCC crystal structure [38][39][40][41][42][43][44].…”

Hydrogen embrittlement of twinning-induced plasticity steels: Contribution of segregation to twin boundaries

“…Koyama and coworkers reported hydrogen at twin boundaries in a TWIP steel by scanning Kelvin probe force microscopy [46], which is in agreement with our observations, although the coherency of the studied twin boundaries was not reported. It has been proposed that hydrogen reduces the stacking fault energy in austenitic steels [47,48]causes a high twinability at the grain boundary leading to the formation of more deformation twins, which upon which crack on their exposure to hydrogen can be subject to decohesion and facilitate crack propagation. The hydrogen embrittlement hence occurs by hydrogen-enhanced twin boundary decohesion.…”

Hydrogen Embrittlement as a Conspicuous Material Challenge─Comprehensive Review and Future Directions

“…The HE susceptibility of austenitic steel is highly dependent on its microstructure, for instance, austenitic steels with appropriate deformation twinning were found to be less susceptible. In fact, an interesting phenomenon of the so-called H-induced ductilization, where the material becomes even more ductile in the presence of H, was recently reported. , The studies indicated that appropriate twinability engineering could be a promising path toward mitigation of HE, as discussed in Section . The susceptibility to H-induced loss of ductility was found to increase with the level of geometric constraint.…”

“…504 By elevating the SFE, the detrimental effect of twinninginduced stress concentration can be remarkably mitigated. 505 It was demonstrated that the addition of Al can effectively suppress H-induced IG fracture, by increasing the SFE and postponing the nucleation of twins, thus reducing the stress level at GBs. 501,506,507 The effect of the addition of Mn has been under debate: Zhou et al 508 found that an increase of Mn content reduced the H diffusion coefficient and H solubility in TWIP steel, which tends to improve the HE resistance of TWIP steel.…”