Factors Affecting Texture Memory Appearing through α→γ→α Transformation in IF Steels

Abstract

In case where IF steel is heat treated in γ region, α→γ and γ→α transformation during heating and cooling, i.e. α→γ→α transformation, take place during heating and cooling, respectively. The initial texture of α is potentially weakened due to two times transformation in general. On the contrary, the α→γ→α transformed texture resembles the initial texture clearly under specific circumstances. Authors call this phenomenon “texture memory”. A very distinct texture memory effect was found in IF steels. Lowering the γ→α transformation temperature pronounces texture memory significantly. The variant selection at grain boundary of γ seems to play an important role. Moreover, it is considered that the initial α texture has to be sharp to in order to realize texture memory.