Hydrogen Embrittlement Susceptibility of Fe-Mn Binary Alloys with High Mn Content: Effects of Stable and Metastable ε-Martensite, and Mn Concentration

Koyama, Motomichi; Okazaki, Saburo; Sawaguchi, Takahiro; Tsuzaki, Kaneaki

doi:10.1007/s11661-016-3431-9

Cited by 78 publications

(15 citation statements)

References 53 publications

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“…[22,23] Furthermore, hydrogen accelerates the occurrence of e-martensite-related cracking, which makes the damage problem serious, i.e., hydrogen embrittlement. [24,25] However, when regarded as hydrogen-resistant steels, the formation of e-martensite has some advantageous features: (1) the c/e interface acts as micro-crack arrest site, [12,26] and (2) e-martensite is more resistant to hydrogen in terms of fatigue crack growth, compared with a¢-martensite. [26][27][28][29] Therefore, an optimized hydrogen-damage-transformation relationship may enable new high-strength hydrogen-resistant steels.…”

Section: Deformation-induced Martensitic Transfor-mentioning

confidence: 99%

Quantitative Evaluation of Hydrogen Effects on Evolutions of Deformation-Induced ε-Martensite and Damage in a High-Mn Steel

Hao

Koyama

Akiyama

2020

Metall Mater Trans A

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We investigated the effects of hydrogen on e-martensite-related damage evolution (crack/void initiation and growth) in Fe-Mn-Si-base austenitic steel using tensile tests after gaseous hydrogen charging at 100 MPa. Specifically, we evaluated the quantitative hydrogen effects on e-martensite fraction and associated damage evolution with different strains and strain rates. Hydrogen charging increased the probability of e-martensite-related damage initiation and deteriorated micro-damage arrestability, which decreased elongation. The primary factor causing the detrimental hydrogen effects on resistance to damage evolution was the promotion of deformation-induced c-e martensitic transformation. An increasing strain rate from 10 À4 to 10 À2 s À1 suppressed the c-e martensitic transformation and correspondingly increased elongation. Interestingly, the e-martensite fraction near the fracture surface did not change with increasing strain rate, but the area fraction of the brittle-like fracture region decreased. This fact implied that the brittle-like fracture at the low strain rate, which had a longer time for damage growth, was assisted by stress-driven hydrogen diffusion near the crack/void tips.

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Section: Deformation-induced Martensitic Transfor-mentioning

confidence: 99%

Quantitative Evaluation of Hydrogen Effects on Evolutions of Deformation-Induced ε-Martensite and Damage in a High-Mn Steel

Hao

Koyama

Akiyama

2020

Metall Mater Trans A

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“…There is a high demand for the visual clarification of microstructural hydrogen diffusion and distribution kinetics in order to gain a quantitative understanding of hydrogen embrittlement mechanisms. For instance, hydrogen-assisted cracking occurs at specific grain/phase boundaries [1][2][3][4]. The factors causing the cracking are preferential diffusion and the segregation of hydrogen on or in the vicinity of the grain boundaries.…”

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confidence: 99%

In situ observations of silver-decoration evolution under hydrogen permeation: Effects of grain boundary misorientation on hydrogen flux in pure iron

et al. 2017

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An in situ silver decoration technique using a light microscope was developed. Hydrogen was introduced from the bottom surface of an annealed pure iron specimen, and its top surface was covered with a chemical solution containing silver ions. Samples were exposed for sufficient time for hydrogen permeation to occur from the back to the top surface. The resultant in situ silver decoration visualized that the hydrogen flux through low-angle grain boundaries is lower than that observed at high-angle grain boundaries. The in situ silver decoration technique can be used for kinetic analysis of solute hydrogen in ferritic iron and steels.

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“…The hydrogen-assisted quasi-cleavage cracking in TWIP steels has been reported to arise from twin boundary cracking [43,44] or martensite-related boundary cracking [27]. Specifically, the boundary cracking modes stem from microstructural stress concentration [45,46]. Therefore, possible microstructural stress concentration sources are demonstrated through multi-probe microstructure characterization in section 3.3. at 0.6 × 10 -3 s -1 .…”

Section: Tensile Tests and Associated Microstructure Characterizationmentioning

confidence: 99%

Effect of strain rate on hydrogen embrittlement susceptibility of twinning-induced plasticity steel pre-charged with high-pressure hydrogen gas

Bal

Koyama

Gerstein

et al. 2016

International Journal of Hydrogen Energy

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The effects of tensile strain rate on the hydrogen-induced mechanical and microstructural features of a twinning-induced plasticity (TWIP) steel were investigated using a Fe-23Mn-0.5C steel with a saturated amount of hydrogen. To obtain a homogeneous hydrogen distribution, high-pressure hydrogen gas pre-charging was performed at 423 K. Similar to previous studies on hydrogen embrittlement, the deterioration in the tensile

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Hydrogen Embrittlement Susceptibility of Fe-Mn Binary Alloys with High Mn Content: Effects of Stable and Metastable ε-Martensite, and Mn Concentration

Cited by 78 publications

References 53 publications

Quantitative Evaluation of Hydrogen Effects on Evolutions of Deformation-Induced ε-Martensite and Damage in a High-Mn Steel

Quantitative Evaluation of Hydrogen Effects on Evolutions of Deformation-Induced ε-Martensite and Damage in a High-Mn Steel

In situ observations of silver-decoration evolution under hydrogen permeation: Effects of grain boundary misorientation on hydrogen flux in pure iron

Effect of strain rate on hydrogen embrittlement susceptibility of twinning-induced plasticity steel pre-charged with high-pressure hydrogen gas

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