The austenite-to-martensite transformation in Fe–30%Ni after deformation by simple shear Original Research Article

The dislocation reaction model for variant selection during the austenite-to-martensite transformation was first suggested by Sum and Jonas. The model is based on the one-to-one correspondence between the Kurdjumov–Sachs transformation products and the 24 possible Bishop and Hill slip systems. The selection criteria of the model specify that only the active slip system and their permissible reaction product variants are selected. Successful predictions have been obtained for three simple strain paths: (i) axisymmetric extension, (ii) axisymmetric compression, and (iii) plane strain rolling. Using a similar methodology, the dislocation reaction model is evaluated for the final distinct strain path, namely simple shear. Experimental deformation and transformation textures were produced via torsion experiments at a temperature of 320°C and a subsequent quenching procedure in liquid nitrogen. The transformation texture predicted using the dislocation reaction model is in excellent agreement with the experimental findings.