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

采用等距角压（ECAP）技术对16质量%Cr钢板进行冷轧前一道次等径角压，以提高成形性能，减轻钢板起皱。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。与单独冷轧相比，一次ECAP确实改善了冷轧组织、织构和随后的再结晶。ECAP在<001>//ND晶粒中引入了晶粒尺度的剪切带，促进了再结晶的发生。然而，将通道角从120°减小到90°对再结晶和成形性能的影响有限，尽管施加在板材上的剪切应变较高。

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.