期刊
ISIJ INTERNATIONAL
卷 56, 期 11, 页码 2037-2046出版社
IRON STEEL INST JAPAN KEIDANREN KAIKAN
DOI: 10.2355/isijinternational.ISIJINT-2016-272
关键词
high Mn austenitic steel; epsilon-martensite; damage; replica method; digital image correlation; electron back scatter diffraction; electron channeling contrast imaging
资金
- ISIJ Research Promotion Grant
- [15K18235]
- Grants-in-Aid for Scientific Research [15K18235] Funding Source: KAKEN
We studied damage evolution behavior associated with epsilon-martensite in a Fe-28Mn alloy. Visible factors of damage evolution associated with epsilon-martensite are considered to be strain distribution, microstructure, micro-void and crack. Combinatorial use of replica digital image correlation, electron backscattering diffraction, and electron channeling contrast imaging enables to clarify the distributions of strain, microstructure and damage. Through quantitative damage analysis, damage evolution behavior was classified into three regimes: (i) incubation regime, (ii) nucleation regime, and (iii) growth regime. In the incubation regime, an interaction of epsilon/epsilon-martensite plates and impingement of epsilon-martensite plates on grain boundaries caused plastic strain localization owing to plastic accommodation. In the nucleation regime, accumulation of the plastic strain on the boundaries caused microvoid formation. The damage propagated along with the boundaries through coalescence with other micro-voids, but the propagation was arrested by crack blunting at non -transformed austenite. In the growth regime, the arrested damage grew again when a further plastic strain was provided sufficiently to initiate epsilon-martensite near the damage.
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