Texture control for high formability of ferritic stainless steel by combined processing of ECAP and cold-rolling

为了改善16mass%Cr钢冷轧前的成形性能和减少起皱现象，对16mass%Cr钢进行了单道次ECAP变形。重点研究了ECAP通道角（90°和120°）对变形组织及后续再结晶的影响。与单纯冷轧相比，单道次ECAP确实改善了冷轧组织、织构和随后的再结晶。特别是，晶粒尺度的剪切带在ECAP过程中引入，否则难以再结晶<001>//ND晶粒ECAP，他们促进再结晶。然而，通道角从120°减小到90°对再结晶和成形性的影响是有限的，尽管施加在板上的较高的剪切应变。

Equal-channel angular pressing (ECAP) was applied to 16mass%Cr steel sheets for one pass prior to cold rolling in order to improve formability and alleviate ridging of the sheets. Effect of channel angle of ECAP (90° and 120°) on the deformation microstructure and the subsequent recrystallization was focused. One-pass ECAP indeed modified the cold-rolled microstructures, texture and subsequent recrystallization as compared with that in cold rolling alone. In particular, grain-scale shear bands were introduced during ECAP in otherwise hard-to-recrystallize <001>//ND grains by ECAP, and they facilitated the recrystallization. However, the effect of reducing the channel angle from 120°to 90°on the recrystallization and the formability was limited in spite of higher shear strain imposed on the sheets.