MSA> Vol.3 No.9, September 2012

Author(s)

Tong Xiao, Hiroyuki Miyamoto, Toshiyuki Uenoya

Department of Mechanical Engineering, Doshisha University, Kyoto, Japan.

The extended band structures of as-cold-rolled high Cr steel sheets are recrystallisation-resistant, and tend to become aggregates of the so-called grain colonies as a partially recovered state after final annealing. Such band structures diminish formability and become origin of the so-called ridging. A novel processing will be shown here, which involves strain-path change by introducing one-pass ECAP prior to cold-rolling, and facilitates recrystallisation. Indeed, the recrystallisation temperature was reduced by 100℃, compared with cold-rolling alone imposing an equivalent strain. Grain- scale microshear bands introduced during one-pass ECAP perturbed the banded structures in post-ECAP cold-rolling and enhanced the recrystallisation at the final annealing.

Severe Plastic Deformation; Equal-Channel Angular Pressing (ECAP); Recrystallisation; Texture; Ferritic Stainless Steel; Strain Path

T. Xiao, H. Miyamoto and T. Uenoya, "Equal-Channel Angular Pressing as a New Processing to Control the Microstructure and Texture of Metallic Sheets," Materials Sciences and Applications, Vol. 3 No. 9, 2012, pp. 600-605. doi: 10.4236/msa.2012.39086.