Rolling Textures and Anisotropy in Mechanical and Magnetic Properties in Unidirectionally Solidified and Cold-Rolled 18-8 Stainless Steel

Abstract

18-8 stainless steel ingots solidified unidirectionally were cold-rolled in the longitudinal, transverse and perpendicular directions of columnar crystals.
During cold-rolling to 95% reduction in thickness, all the specimens transform from γ phase to a phase. This strain-induced transformation proceeds most slowly in the specimen cold-rolled in the direction parallel to the growth direction of columnar crystals.
The cold-rolling textures of α phase consist mainly of {211}‹011› and {100}‹011› orientations.{211}‹011› orientation is the major component of the specimen rolled in the direction parallel to the growth direction of columnar crystals, whereas it is {100}‹011› orientation for the other specimens.
The maximum value of Young's modulus is obtained by cold-rolling and subsequenttempering at 550°C. Lowering of saturation magnetization, rise of coercive force, and increase in the magnetic anisotropy by tempering at around 600°C are supposed to be correlated with the shape anisotropy of ferromagnetic α phase in non-magnetic γ phase, formed by reverse transformation.