Abstract
Expansions of martensite transformation in S34MnV steel are studied under tensile and compressive stresses using a Gleeble-3500 thermo-mechanical simulation system. Coupled analyses of the experimental data are conducted to simultaneously determine the transformation kinetic parameters in the Koistinen-Marburger equation and the transformation plasticity coefficient in the Greenwood-Johnson model of martensite transformation. Such components as elastic strain, thermal strain and transformation strain are extracted from the total strain so as to determine the transformation plasticity strain under various loads. Transformation plasticity data are fit into the Greenwood-Johnson model to obtain the transformation plasticity coefficient K. Transformation plasticity coefficient K in the Greenwood-Johnson model has a constant value under tensile stresses and another lower value under compressive stresses. Effects of applied stresses on kinetic parameters α and Ms in the Koistinen-Marburger model are evaluated but found insignificant.
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