A synchrotron X-ray diffraction study on the phase transformation kinetics and texture evolution of a TRIP steel subjected to torsional loading

The martensitic phase transformation kinetics and the relation with texture evolution in the constituent phases were studied for a transformation-induced plasticity (TRIP) steel under a torsional loading condition at ambient temperature. Synchrotron X-ray diffraction was used to measure the evolution of phase fractions and texture in terms of pole figures and orientation distribution functions as a function of the applied shear strain. The effects of deformation texture development in the parent austenite phase on the observed phase transformation kinetics are discussed in terms of preferred transformation mechanisms. The texture evolution in the product martensite phase is also discussed in terms of possible texture inheritance from the parent austenite phase and its own deformation texture.