Textura de transformação da martensita induzida por deformação em aços inoxidáveis austeníticos

Abstract

Austenitic stainless steels with low stacking fault energy are subject to martensite transformation when cold-deformed. Several authors report that this transformation follows the orientation relationships of Kurdjumov - Sachs or Nishiama - Wassermann. Bhadeshia and other authors have systematically countering those statements showing that this transformation follows the classical theory of the formation of martensite. The martensitic transformation requires the existence of an invariant plane and a plane of habit and not just a change of direction as shown in many studies. In this work, the results obtained by EBSD in an AISI301 stainless steel samples deformed in a tension test were used to analyze microtexture. To analyze macrotexture data for AISI 304 steel texture were accurately measured using micro - X-ray diffraction in a Synchrotron and published in the literature used. In both cases the experimental results of phase transformed texture were compared with results calculated using the classical theory of martensitic transformation (PMTC) and using the relations Kurdjumaov -Sachs (KS) and Nishiyama - Wassermann (NW). It was assumed that the selection of variants followed the model of Patel – Cohen.