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对低温Fe-3%Si取向硅钢在二次冷轧工艺中不同冷轧压下率下的显微组织进行了分析。结果表明,当第一次冷轧总压下率为42%和52%时,冷轧板显微组织形变度小,冷轧板中的储存能小,再结晶驱动力小,使中间退火后得到的再结晶晶粒粗大,粗大的晶粒遗传给第二次冷轧工艺,不利于高温退火过程中二次再结晶晶粒长大而获得粗大的成品晶粒;当第一次冷轧总压下率为61%和71%时,冷轧板显微组织形变严重,晶粒内畸变能高,冷轧板中的储存能大,再结晶的驱动力大,使中间退火后得到的再结晶晶粒变细,有利于高温退火中二次再结晶晶粒吞并初次晶粒而长大,获得粗大的成品晶粒;当第一次冷轧总压下率为81%时,冷轧板显微组织形变度过大,使中间退火后再结晶晶粒出现二次再结晶现象,晶粒异常长大,显微组织不均匀,不能获得满意的成品晶粒。
The microstructure of low temperature Fe-3% Si-oriented silicon steel under different cold rolling reduction rates in secondary cold rolling process was analyzed. The results show that when the total rolling reduction of the first cold rolling is 42% and 52%, the microstructure of the cold-rolled sheet has a small deformation degree, a small storage capacity in the cold-rolled sheet and a small recrystallization driving force. After the intermediate annealing The obtained recrystallized grains are coarse and the coarse grains inherit to the second cold rolling process, which is unfavorable for the secondary recrystallized grains to grow in the high temperature annealing process to obtain coarse finished grains. When the first cold rolling total When the reduction rates are 61% and 71%, the microstructures of the cold-rolled sheet deform seriously, the intragranular distortion energy is high, the storage energy in the cold-rolled sheet is large and the driving force of recrystallization is large. The crystal grains become thinner, which is favorable for the secondary recrystallized grains to be swallowed by the primary recrystallization grains in the high-temperature annealing and grow up to obtain coarse finished grains; when the total reduction rate of the first cold rolling is 81%, the cold-rolled sheets The deformation degree of the microstructure is too large, so that the recrystallized grains appear secondary recrystallization after the intermediate annealing, the grains grow abnormally, the microstructure is not uniform, and the finished grains can not be obtained satisfactorily.