Hydrogen-assisted damage in austenite/martensite dual-phase steel

Motomichi Koyama, Cemal Cem Tasan, Tatsuya Nagashima, Eiji Akiyama, Dierk Raabe, Kaneaki Tsuzaki

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15 Citations (Scopus)

Abstract

For understanding the underlying hydrogen embrittlement mechanism in transformation-induced plasticity steels, the process of damage evolution in a model austenite/martensite dual-phase microstructure following hydrogenation was investigated through multi-scale electron channelling contrast imaging and in situ optical microscopy. Localized diffusible hydrogen in martensite causes cracking through two mechanisms: (1) interaction between {1 1 0}M localized slip and {1 1 2}M twin and (2) cracking of martensite-martensite grain interfaces. The former resulted in nanovoids along the {1 1 2}M twin. The coalescence of the nanovoids generated plate-like microvoids. The latter caused shear localization on the specific plane where the crack along the martensite/martensite boundary exists, which led to additional martensite/martensite boundary cracking.

Original languageEnglish
Pages (from-to)9-18
Number of pages10
JournalPhilosophical Magazine Letters
Volume96
Issue number1
DOIs
Publication statusPublished - Jan 2 2016

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Koyama, M., Tasan, C. C., Nagashima, T., Akiyama, E., Raabe, D., & Tsuzaki, K. (2016). Hydrogen-assisted damage in austenite/martensite dual-phase steel. Philosophical Magazine Letters, 96(1), 9-18. https://doi.org/10.1080/09500839.2015.1130275