退火对单/双相区热轧无取向硅钢组织织构的影响

Effect of Annealing Treatment on Microstructure and Texture of Hot-rolled Non-oriented Silicon Steel at Single/Duplex Phase Zones

硅钢热轧后的退火处理对其组织织构具有显著的影响,通过控制热轧条件制备单相区和双相区热轧无取向硅钢试样,并对试样进行退火处理实验(900,1200℃退火15 min),研究退火对单相区和双相区热轧硅钢组织织构的影响。结果表明:热轧硅钢试样中的动态再结晶区域退火后进一步发生静态再结晶,而热轧后未发生动态再结晶的形变组织退火后仍未发生静态再结晶;本文退火条件下试样未发生明显的相变,总体上静态再结晶不利于{100}织构的提高,热轧过程中的剪切变形程度越大,越有利于退火后{100}织构的形成;单相区热轧试样中的动态再结晶是由剪切变形形成的,而双相区热轧试样中的动态再结晶主要是由铁素体-奥氏体相变形成的,由此导致单相区和双相区热轧试样在不同温度退火后的静态再结晶晶粒尺寸和主要织构组分等存在显著差异。

The annealing treatment after hot rolling of silicon steel has a significant effect on its microstructure and texture.The hot-rolled non-oriented silicon steel samples at single/duplex phase zones were prepared by controlling hot rolling conditions,and annealing treatment experiments(at 900,1200℃for 15 min)were conducted on the samples.The effect of annealing treatment on microstructure and texture of hot-rolled silicon steel at single/duplex phase zones was studied.The results show that static recrystallization occurs in the dynamic recrystallization region of hot-rolled silicon steel samples after annealing,while no static recrystallization occurs in the region of hot-rolled deformation microstructure without dynamic recrystallization.Besides,no obvious phase transformation occurs in the samples under the annealing conditions in this article.Generally,the static recrystallization is unfavorable for the improvement of{100}texture.Additionally,the greater the shear deformation during the hot rolling process,the more favorable it is for the formation of{100}texture after annealing.The dynamic recrystallization in single-phase hot-rolled sample is formed by shear deformation,while the dynamic recrystallization in duplex-phase hot-rolled sample is mainly formed by ferrite and austenite phase transformation,resulting in significant differences in static recrystallization grain size and main texture components between single-phase and duplex-phase hot-rolled samples after annealing at different temperatures.