Influence of Deformation Path on Deformation-Induced Martensitic Transformation in Austenitic Stainless Steel

摘要

To explain the effect of the deformation path on the deformation-induced martensitic transformation in austenitic stainless steels, the uniaxial tension test and rolling were carried out, and the amount of deformation-induced martensite was measured. The amount of martensite existing before deformation or martensite formation before deformation was changed by the aging of 77 K. The influence of martensite existing before deformation or martensite formation before deformation and the strain path of deformation-induced martensitic transformation were examined. The following conclusions were obtained. The amount of deformation-induced martensitic transformation differed according to the deformation path. The deformation-induced martensitic transformation follows the hydrostatic stress theory when the martensite exists before deformation. However the deformation-induced martensitic transformation is contrary to the hydrostatic stress theory when the initial martensite does not exist. The growth of martensite obeys the hydrostatic stress theory, and the nucleation of martensite obeys the autocatalytic effect theory.