Hydrogen-assisted failure in a twinning-induced plasticity steel studied under in situ hydrogen charging by electron channeling contrast imaging

Koyama, Motomichi; Akiyama, Eiji; Tsuzaki, Kaneaki; Raabe, Dierk

doi:10.1016/j.actamat.2013.04.030

Cited by 237 publications

(109 citation statements)

References 86 publications

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“…6,11) Mechanical twins also provide both nucleation sites for hydrogen-induced cracking at their intersections and propagation paths along their boundaries in high Mn austenitic steel. 12) Therefore, deformed STS 316L is expected to have the lower resistance to HE, compared to the annealed STS 316L.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Pre-Strain on the Resistance to Hydrogen Embrittlement in 316L Austenitic Stainless Steel

Park

Jung

et al. 2014

Mater. Trans.

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The effect of pre-strain before hydrogen charging on the resistance to hydrogen embrittlement (HE) in the 316L austenitic stainless steel was investigated through the slow strain rate tensile test (SSRT), transmission electron microscopy, and thermal desorption analysis (TDA). The pre-strain suppressed mechanical twinning during the SSRT, regardless of hydrogen charging. However, it accelerated the ¾-martensitic transformation in hydrogen-charged specimens. The TDA revealed that whereas hydrogen atoms migrated from grain boundaries and dislocations mainly to the austenite (£)/¾ interfaces in pre-strained specimens during the SSRTs, they moved to the boundaries of fresh mechanical twins, which newly formed during the SSRTs, in the annealed specimen. The elongation loss by hydrogen charging became greater with increasing the pre-strain, indicating that pre-straining deteriorated the resistance to HE. This elongation loss by pre-strain resulted from both the increase in fraction of ¾-martensite with pre-strain and the segregation of hydrogen atoms to the £/¾ interfaces.

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Section: Introductionmentioning

confidence: 99%

The Effect of Pre-Strain on the Resistance to Hydrogen Embrittlement in 316L Austenitic Stainless Steel

Park

Jung

et al. 2014

Mater. Trans.

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“…1,86,87 Understanding the fracture mechanisms of TWIP steels may be beneficial to avoid sudden slant fracture, unsatisfactory hole expansion performance, 88 delayed fracture 89,90 and fatigue failure. 91,92 Twinning induced plasticity steels show, in general, ductile fracture under tension, consisting of nucleation, growth and coalescent of dimples, despite the observation of quasi-cleavage crack due to martensitic transformation.…”

Section: Fracture Mechanismmentioning

confidence: 99%

Critical Assessment 15: Science of deformation and failure mechanisms in twinning induced plasticity steels

Huang

Liang

Luo

2015

Materials Science and Technology

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Manganese rich austenitic twinning induced plasticity steels with high strength and high ductility have been developed in 1990s as promising candidates for automotive applications. Tremendous efforts have therefore been made to explore the unusual deformation and failure mechanisms of these alloys. We provide here a critical assessment of the recent progress in understanding their deformation and failure mechanisms and discuss some scientific challenges that remain unresolved, for example, a physically based twinning kinetics model.

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“…For hydrogencharged Fe-Mn-C steels, it was reported that crack initiation occurred in the deformation twin plane. 24) Next, stage (b) of initial crack propagation around the crack initiation site was investigated. For the SUJ2 and SUJ2 + σ specimens containing γ R , fracture occurred at crack initiation sites (grain boundaries or inclusions) and then propagated as IG in the case of the non-hydrogen-charged specimens, while fracture occurred at crack initiation sites (grain boundaries or inclusions) and then propagated as QC and then IG only in the case of hydrogen charging.…”

Section: Local Characterization At Crack Initiation Sites Of Suj2mentioning

confidence: 99%

Hydrogen Embrittlement and Local Characterization at Crack Initiation Associated with Phase Transformation of High-strength Steel Containing Retained Austenite

et al. 2018

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States of hydrogen present in high-strength steels for use as bearing steel SUJ2 and hydrogen embrittlement susceptibility were examined using thermal desorption analysis (TDA) and tensile tests. SUJ2 specimens containing the retained austenite phase (γ R ) in the martensitic phase exhibited three hydrogen desorption peaks in the TDA profile. Two of the peaks desorbed at higher temperatures decreased with a decreasing amount of γ R , indicating they corresponded to desorption associated with γ R . Fracture strength in the presence of hydrogen increased with a decreasing amount of γ R and with an increasing strain rate. For the specimens containing γ R and hydrogen, a flat facet at the crack initiation site and a quasi-cleavage (QC) fracture in the initial crack propagation area were observed on the fracture surface. Local characterization using electron back-scattered diffraction (EBSD) revealed that the flat facet on the fracture surface corresponded not to γ R but to strain-induced martensite. In addition, the facet was on the {112} plane of martensite, which is the slip plane or deformation twin plane of body-centered-cubic metals. The reason for high hydrogen embrittlement susceptibility of the specimens containing γ R was attributed to the straininduced phase transformation at the crack initiation site of the flat facet and in the initial crack propagation area of the QC fracture. Furthermore, the strain rate dependency of hydrogen embrittlement susceptibility is presumably ascribable to local plastic deformation, i.e., the interaction between dislocations and hydrogen.

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Hydrogen-assisted failure in a twinning-induced plasticity steel studied under in situ hydrogen charging by electron channeling contrast imaging

Cited by 237 publications

References 86 publications

The Effect of Pre-Strain on the Resistance to Hydrogen Embrittlement in 316L Austenitic Stainless Steel

The Effect of Pre-Strain on the Resistance to Hydrogen Embrittlement in 316L Austenitic Stainless Steel

Critical Assessment 15: Science of deformation and failure mechanisms in twinning induced plasticity steels

Hydrogen Embrittlement and Local Characterization at Crack Initiation Associated with Phase Transformation of High-strength Steel Containing Retained Austenite

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