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A Shear Strain Route Dependency of Martensite Formation in 316L Stainless Steel

Published online by Cambridge University Press:  24 April 2015

Suk Hoon Kang ,
Tae Kyu Kim ,
Jinsung Jang  and
Kyu Hwan Oh
Suk Hoon Kang*
Affiliation:
Nuclear Materials Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea
Tae Kyu Kim
Affiliation:
Nuclear Materials Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea
Jinsung Jang
Affiliation:
Nuclear Materials Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea
Kyu Hwan Oh
Affiliation:
Department of Materials Science and Engineering, Center for Iron & Steel Research, RIAM, Seoul National University, Seoul 151-744, Korea
*
*Corresponding author. shkang77@kaeri.re.kr
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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.

Keywords

316L stainless steelsshear straintwin boundariesstrain-induced martensite
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 21 , Issue 3 , June 2015 , pp. 582 - 587
Copyright
© Microscopy Society of America 2015 

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