Assessment of deformation-induced transformation behavior of ferritic/austenitic steel by fine focused X-ray diffraction

Abstract

The behavior of the deformation-induced martensitic transformation (DIMT) of ferritic(α)/austenitic(γ) steel is affected by various factors. Moreover, each γ grain has the different behavior of the DIMT. In this study, the behavior of the DIMT each γ grain was investigated with using fine focused X-ray diffraction during in situ uniaxial tensile loading. The DIMT has already occurred to a lot of γ grains immediately after the yielding point. The bigger γ grain transformed early to martensite. The γ grains transformed immediately after the yielding point, plastic strained before the yielding point. It is considered that the transformation mechanism in this material is strain-induced transformation.