湿H_2气氛下CGO硅钢初次再结晶织构演变行为

Texture evolution of CGO silicon steel during primary recrystallization process under wet hydrogen atmosphere

通过对湿H2气氛下,相同退火温度、不同退火时间的CGO硅钢初次再结晶样品进行金相组织观察,并进行了EBSD微观织构分析,研究了CGO硅钢初次再结晶过程中的组织及再结晶织构演变行为。结果表明,在湿H2气氛下,820℃保温,CGO硅钢初次再结晶过程约在120 s时完成。随着退火时间的延长,γ面上{111}<112>织构含量逐渐减少,{111}<110>织构先减少后增多,随着再结晶的完成,部分{111}<112>取向晶粒向高斯{110}<001>取向转化的同时,也向{111}<110>取向转化,高斯{110}<001>织构含量逐渐增多。高斯取向晶粒较多是由{111}<112>取向晶粒转化而来,同时也证明了CGO硅钢高斯取向晶粒的二次再结晶异常长大生长机制为择优形核。

Microstructure development and texture evolution of conventional grain oriented silicon steel, which were annealed at same annealing temperature and different annealing time under wet H2 atmosphere, were investigated through metallographic observation and electron backscattered diffraction analyzing. The results show that the primary recrystallization finishes in 120 s at 820 ~C under wet H2 atmosphere. With the extending of annealing time, { 111 / 〈 112 〉 texture decreases, { 111 } 〈 110 〉 texture decreases first and then increases. When the recrystallization completing, part of the {111} 〈112 〉 texture converts to {110} 〈001 〉 and {111} 〈110 〉 texture at the same time, and { 110} 〈 001 〉 texture increases gradually. Goss grains are mainly converted from { 111 } 〈 112 〉 oriented grains, this results also indicate that the mechanism of Goss grain abnormal growth behavior during secondary recrystallization is preferential nucleation.