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分析了硅含量为2.0 wt%的高牌号冷轧无取向硅钢冷轧变形量和不同退火温度对再结晶织构及晶粒尺寸的影响。结果表明,热轧板表面与心部组织和织构的差异对后续冷轧和再结晶退火的织构和晶粒尺寸有明显影响。热轧板表面的退火态晶粒组织使其织构转变滞后于心部,并可造成最终退火后较强的{001}〈110〉织构和均匀的{111}织构,有利于磁性的改善。提高冷变形量会增加再结晶形核率而减小晶粒尺寸,提高再结晶温度不明显改变再结晶织构但增大晶粒尺寸,但应防止过高温度下析出相粒子的回溶。分析表明,热轧板常化工艺,以及二次冷轧加中间退火工艺均有利于改善钢板成品织构,进而改善钢板磁性能。
The influence of cold rolling deformation and annealing temperature on recrystallization texture and grain size of high grade cold rolled non-oriented silicon steel with 2.0 wt% silicon content was analyzed. The results show that the difference between microstructure and texture on the surface of the hot rolled sheet and the core has a significant effect on the texture and grain size of subsequent cold rolling and recrystallization annealing. The annealed grain structure on the hot rolled plate surface lags the texture of the core and causes the stronger {001} <110> texture and the uniform {111} texture after final annealing, which is in favor of magnetic improve. Increasing the amount of cold deformation increases the nucleation rate of recrystallization and decreases the grain size. Increasing the recrystallization temperature does not significantly change the recrystallization texture but increases the grain size. However, the backwashing of precipitated phase particles should be prevented at too high temperature. The analysis shows that the hot-rolled plate normalizing process and the secondary cold-rolling plus intermediate annealing process are all conducive to improving the texture of the finished steel sheet and further improving the magnetic properties of the steel sheet.