The occurrence of variant selection during the transformation of deformed austenite has been investigated by many authors. In recent times, Professor J.J. Jonas and a few co-workers have developed two basicallly different models for predicting fcc-to-bcc transformation textures, with considerable success. Both use individual orientations and a set of variant selection rules; both assume the Kurdjumov-Sachs orientation relationship; both are capable of dealing with discretised parent textures; both work only for austenite in the deformed state previous to the transformation. In one, variant selection is consdiered from a transformation work-plus-slip activity selection rule point of view. In the other, variant selection is achieved via a dislocation reaction-plus-slip activity rule. In the present work a brief review of these two approaches is made, discussing the importance of developing physical models that account for the known features involved in the phenomenon. The predictions of the two models are compared and a few suggestions are advanced aiming at the development of a general computer programme capable of dealing with real experimetnal deformation textures. It is also a record of a period when Prof. Jonas' insight and creactivity was the permanent guideline.
展开▼
