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研究了低温取向硅钢在625~850℃的等温退火过程,根据Avrami方程建立了其初次再结晶动力学模型,并利用EBSD技术对初次再结晶织构演变过程进行了分析。结果表明:当退火温度为850℃时保温5s即可发生完全再结晶;而在625℃下保温1.7h以上再结晶才能进行完全。当退火温度在625~700℃时,Avrami指数n在0.82~0.89之间,当退火温度在750~850℃时,n值在1.25~1.27之间,相对应的再结晶激活能QRX分别为239.3、160.4kJ/mol。初次再结晶早期主要发生在高储存能的γ纤维织构上,而中后期则主要发生在低储存能的α纤维织构上。初次再结晶完成后织构类型主要是以{111}<112>组分为主的γ织构、{114}<418>织构及少量分布在次表层的Goss织构。
The isothermal annealing process of low temperature oriented silicon steel at 625 ~ 850 ℃ was studied. The kinetic model of primary recrystallization was established according to Avrami equation. The evolution of primary recrystallization texture was analyzed by EBSD technique. The results show that complete recrystallization occurs when the annealing temperature is 850 ℃ for 5 seconds, while the recrystallization can be carried out at 625 ℃ for 1.7 h. When the annealing temperature is in the range of 625 ~ 700 ℃, the Avrami index n is between 0.82 and 0.89. When the annealing temperature is in the range of 750 ~ 850 ℃, the value of n is between 1.25 and 1.27, and the corresponding QRX of recrystallization is 239.3 , 160.4 kJ / mol. The early recrystallization mainly occurred on the γ-fiber texture with high storage energy, while the mid-late period mainly occurred on the α-fiber texture with low storage energy. The texture type after primary recrystallization is mainly γ texture with {111} <112> component, {114} <418> texture and a small amount of Goss texture distributed in the subsurface.