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

The dislocation reaction model for variant selection during the austenite-t o-martensite transformation was first suggested by Sum and Jonas. The model is based on the one-to-one correspondence between the Kurdjumov-Sachs tran sformation products and the 24 possible Bishop and Hill slip systems. The s election criteria of the model specify that only the active slip system and their permissible reaction product variants are selected. Successful predi ctions have been obtained for three simple strain paths: (i) axisymmetric e xtension, (ii) axisymmetric compression, and (iii) plane strain rolling. Us ing a similar methodology, the dislocation reaction model is evaluated for the final distinct strain path, namely simple shear. Experimental deformati on and transformation textures were produced via torsion experiments at a t emperature of 320 degrees C and a subsequent quenching procedure in liquid nitrogen. The transformation texture predicted using the dislocation reacti on model is in excellent agreement with the experimental findings. (C) 2000 Acta Metallurgica rite. Published by Elsevier Science Ltd. All rights rese rved.