热轧板常化工艺对取向硅钢冷轧板退火组织和性能的影响

试验研究了取向硅钢(/%:0.046C,3.07Si,0.09Mn,0.029P,0.004S,0.005 Al,0.001Ti,0.001 40,0.009 6N)2.66 mm热轧板1 100℃2 min空冷10 s至960℃3min空冷常化后,经一次冷轧,中间退火,二次冷轧0.3 mm板,820℃5 min空冷初次再结晶退火,并经1 050℃空冷二次再结晶退火后的组织、织构和磁性能。通过对比常化和无常化样品的初次再结晶退火后试样以及二次再结晶退火后试样的组织和性能,得出常化工艺对退火过程的影响。结果表明,热轧板常化处理可以降低冷轧板初次退火后的初次再结晶晶粒尺寸,使∑₉晶界和大角度晶界百分含量增加,高斯取向晶粒含量增加,还可以使二次再结晶晶粒增大,提高磁感应强度、降低铁损。

Effect of Hot-Rolled Plate Normalization Process on Structure and Properties of Annealed Cold-Rolled Sheet of Oriented Silicon Steel

The structure, texture and magnetic performance of annealed cold-rolled sheet of oriented silicon steel (/%: 0. 046G, 3. 07Si, 0. 09Mn, 0. 029P, 0. 004S, 0. 005Al, 0. 001 Ti, 0.001 40, 0.009 6N) from 2. 66 mm hot-rolled plate normalizing at 1 100 ℃ for 2 min, air cooling for 10 s to 960 ℃ for 3 min, air cooling, then first cold-rolling, process annealing and second cold-rolling to 0.3 mm sheet, and through primary recrystallizing annealing at 820 TI for 5 min, air cooling and secondary recrystallizing annealing at 1 050 ℃, air cooling have been, tested and studied. As contrasted to the structure and properties of primary recrystallizing annealed samples and secondary recrystallizing annealed samples without via hot-rolled plate normalizing process, the effect of normalizing process on annealing process is obtained. Results show that the normalizing treatment of hot-rolled plate may decrease the primary recrystallizing grain size of the primary annealed cold-rolled sheet, increases the percentage of Σ₉ grain boundaries and high-angle grain boundaries, improves the content of Goss orientation grains, and can coarsen the secondary recrystallizing grains, enhance the magnetic induction and decrease the iron loss.