高磁感取向硅钢27QG090的常化退火工艺

Normalizing annealing process of 27QG090 high magnetic induction oriented silicon steel

采用中试试验平台完成高磁感取向硅钢27QG090实验室常化退火工艺过程,利用光学显微镜、X射线衍射仪、透射电镜和能谱仪分析常化退火处理后试样的显微组织和宏观织构。结果表明,高磁感取向硅钢27QG090常化退火后的显微组织为铁素体,宏观织构主要是以α织构、α*织构、铜型织构为主,兼有微弱的高斯织构,常化退火后的析出物主要是AlN,其平均尺寸约为40 nm。综合分析得出最优的常化退火工艺为1120℃×3 min+920℃×3 min, 100℃水淬。

Normalizing annealing of 27QG090 high magnetic induction oriented silicon steel was completed in laboratory by using pilot-scale test platform, and the microstructure and macro texture were analyzed by means of optical microscope, X-ray diffractometer, TEM and EDS. The results show that the microstructure of the 27QG090 steel after normalizing annealing is ferrite, the macro texture is mainly α, α*and copper texture, and with weak Gauss texture. The precipitate after normalizing annealing is mainly AlN, whose average size is about 40 nm. Comprehensive analysis shows that the optimal normalizing annealing process is heating at 1120 ℃ for 3 min and at 920 ℃ for 3 min, then 100 ℃ water quenching.