NDLI: Strain-induced martensite formation in austenitic stainless steel

Content Provider	Springer Nature Link
Author	Okayasu, Mitsuhiro Fukui, Hirobu Ohfuji, Hiroaki Shiraishi, Tetsuro
Copyright Year	2013
Abstract	In situ measurements of the strain-induced martensitic transformation (SMTs) of SUS304 stainless steel that takes place during tensile loading at room temperature were performed around the notch of a dumbbell-shaped specimen where high stress concentration occurs. Even in the low plastic strain regime, with loading to 0.2 % proof stress (σ $_{0.2}$), some SMTs occurred. However, the area fraction of the Fe-α′-martensite phase did not increase significantly even when the sample was loaded to the ultimate tensile strength (σ $_{UTS}$). After the σ $_{UTS}$ point, the total fraction of the Fe-α′ phase increased dramatically to the fracture point (σ $_{f}$). The phase textures of Fe-α′ and Fe-γ were almost equal at (σ $_{UTS}$ − σ $_{f}$)/2, and the Fe-α′ phase was observed over almost the entire measurement area around the notch at the σ $_{f}$ point. However, the area fraction of the Fe-α′ phase at the σ $_{f}$ point decreased far away from the fracture surface, to an extent that the total fraction of the Fe-α′ phase was almost the same as that of the Fe-γ phase in an area about 1.7 mm from the fracture face. Different martensite characteristics were detected in the stainless steel, depending on the applied load level. This was attributed to the severity of deformation. In particular, deformation twinning, created around σ $_{UTS}$, and severe plastic deformation before fracture make a strong Fe-α′ phase. Details of this phenomenon are interpreted using various approaches, including electron backscatter diffraction analysis and finite element analysis.
Starting Page	6157
Ending Page	6166
Page Count	10
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	48
Issue Number	18
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2013-05-08
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Characterization and Evaluation of Materials Polymer Sciences Continuum Mechanics and Mechanics of Materials Crystallography Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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