异步轧制无取向硅钢的再结晶织构演变

在无取向硅钢冷轧过程中采用同步轧制和速比为1.06,1.125,1.19的异步轧制,以考察异步轧制对冷轧和再结晶织构的影响.研究发现,异步轧制减弱冷轧织构中{001}～{112}〈110〉组分,增强{111}〈112〉并减弱{111}〈110〉组分.{111}〈112〉和{111}～{225}〈110〉形变晶粒内剪切带处分别形成η(〈001〉∥RD)及偏离其15°的η′(Ψ=75°,θ=0～45°,φ=0°)再结晶晶粒,η′因晶核尺寸优势发展成为主要织构组分.异步轧制下形变织构的变化有利于改善再结晶织构特征及性能,其影响随速比增大而增强.

Recrystallization Texture Development in Asymmetrically Rolled Non-oriented Silicon Steel

The non-oriented silicon steel sheets were produced by asymmetric cold rolling with three speed ratios of 1.06,1.125 and 1.19,respectively,and produced also by conventional symmetric cold rolling for comparison.It was found that the asymmetric rolling weakens {001}～{112}〈110〉 components in α fiber(〈110〉∥RD),while strengthens {111}〈112〉 and weakens {111}〈110〉 in γ fiber(〈111〉∥ND).EBSD results showed that η(〈001〉//RD) and η′(Ψ=75°,θ=0～45°,φ=0°) grains nucleate within shear bands in {111}〈112〉 and {111}～{225}〈110〉 deformed grains,respectively.η′ becomes the main recrystallization component because of nuclei size advantage.Recrystallization texture and magnetic properties can be improved by the change of cold rolling texture induced by asymmetric rolling,and the effect of asymmetric rolling is more obvious with the increasing of speed ratio.