|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Japan Institute of Metals International Scholar: Effective Utilization of ε-martensite in Fe-high Mn Austenitic Steels: Aspects of Deformation-induced Reverse Transformation
||Motomichi Koyama, T. Sawaguchi, Kaneaki Tsuzaki
|On-Site Speaker (Planned)
ε-martensite in high Mn austenitic steels has been reported to cause brittle cracking, deteriorating mechanical properties. However, in some specific conditions, ε-martensite plays crucial roles on improvement of low-cycle fatigue resistance, uniform elongation, and yield/tensile strength. A key phenomenon to positively utilize ε-martensite is deformation-induced reverse transformation from ε-martensite to austenite. For instance, reversible deformation-induced ε-martensitic transformation like twinning/detwinning supresses damage accumulation during low-cycle fatigue, drastically improves fatigue life. Furthermore, reversely-transformable pre-existing ε-martensite increases yield/tensile strength without any deterioration of elongation. These phenomena can be interpreted by thermodynamics and crystallographic similarity to mechanical twinning.
||Planned: A print-only volume