title: A Shear Strain Route Dependency of Martensite Formation in 316L Stainless Steel.
abstract: In this study, the effect of simple shearing on microstructure evolution and mechanical properties of 316L austenitic stainless steel were investigated. Two different shear strain routes were obtained by twisting cylindrical specimens in the forward and backward directions. The strain-induced martensite phase was effectively obtained by alteration of the routes. Formation of the martensite phase clearly resulted in significant hardening of the steel. Grain-size reduction and strain-induced martensitic transformation within the deformed structures of the strained specimens were characterized by scanning electron microscopy - electron back-scattered diffraction, X-ray diffraction, and the TEM-ASTAR (transmission electron microscopy - analytical scanning transmission atomic resolution, automatic crystal orientation/phase mapping for TEM) system. Significant numbers of twin networks were formed by alteration of the shear strain routes, and the martensite phases were nucleated at the twin interfaces.
authors.affiliation: 1Nuclear Materials Division,Korea Atomic Energy Research Institute,Daejeon 305-353,Korea.
authors.forename: Suk Hoon
authors.initials: SH
authors.lastname: Kang
authors.affiliation: 1Nuclear Materials Division,Korea Atomic Energy Research Institute,Daejeon 305-353,Korea.
authors.forename: Tae Kyu
authors.initials: TK
authors.lastname: Kim
authors.affiliation: 1Nuclear Materials Division,Korea Atomic Energy Research Institute,Daejeon 305-353,Korea.
authors.forename: Jinsung
authors.initials: J
authors.lastname: Jang
authors.affiliation: 2Department of Materials Science and Engineering,Center for Iron & Steel Research,RIAM,Seoul National University,Seoul 151-744,Korea.
authors.forename: Kyu Hwan
authors.initials: KH
authors.lastname: Oh
keywords: 316L stainless steels; shear strain; strain-induced martensite; twin boundaries