|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Ultrafine-grained Materials X
||Tensile Characteristics of Ultrafine Grained Fe-Cr-Mn Stainless Steel Fabricated by Reverse Transformation
||Jeom-Yong Choi, Ik-Soo Shin, Kyung-Tae Park
|On-Site Speaker (Planned)
A Fe-Cr-Mn stainless steel was cold-rolled to achieve mostly martensitic phase by transformation induced plasticity (TRIP) during cold rolling. The cold-rolled steel was reversely transformed at 700-1000 C. Partial reverse transformation occurred at 700-800 C, resulting in a mixture of untransformed martensite and transformed ultrafine grained (UFG) austenite. At 800-900 C, almost complete reversion occurred and microstructure consisted of mostly UFG austenite. The microstructure of the steel transformed above 900 C consisted of coarse grained (CG) austenite. Regardless of the presence of martensite, tensile deformation of the steel with UFG austenite was characterized by the initial near-perfect plasticity (typical in UFG materials) followed by strain hardening due to TRIP. This consecutive deformation process resulted in high yield and tensile strength over 700 MPa and 1300 MPa respectively with extended elongation over 35%. The steel with CG austenite showed TRIP from the onset of plastic deformation.
||Planned: Supplemental Proceedings volume