新能源汽车用含稀土无取向硅钢生产过程中组织、织构演变

采用光学显微镜、X射线衍射仪及扫描电镜对含稀土无取向硅钢整个生产流程中的显微组织及织构演变进行研究。结果表明,热轧板在厚度方向上有显著的分层,即表层的再结晶层、过渡层、中间层的变形组织层,其织构主要包含铜型、黄铜型织构;正火后晶粒发生了完全再结晶,织构类型相对热轧基本无变化,但强度减弱;两次冷轧后的组织均为纤维组织,形成了以α、γ线性织构为主的织构类型,还出现了强度较高的反高斯织构如{001}<110>、{112}<110>、{111}<110>;脱碳退火后发生部分再结晶,织构相对于冷轧态α、γ线性织构强度均减小;在高温退火阶段晶粒发生再结晶,存在以{111}<112>、{111}<110>为主的γ织构,以及{100}<001>织构。

Microstructure and texture evolution of rare-earth non-oriented silicon steel for new energy vehicles during production

Microstructure and texture evolution in the whole production process of non-oriented silicon steel containing rare earth were studied by means of optical microscope, X-ray diffractometer and scanning electron microscope. The results show that the hot-rolled sheet has significant delamination in the thickness direction, that is, the recrystallized layer of the surface layer, the transition layer, and the deformed structure layer of the intermediate layer, and the texture mainly includes copper-type and brass-type texture. After normalizing, the grains are completely recrystallized, and the texture type is basically unchanged from that of hot rolling, but the strength is weakened; the texture after two cold rolling is all fibrous, forming a texture type dominated by α and γ linear textures. There are also high-strength anti-Gaussian textures such as {001}<110>, {112}<110>, {111}<110>; partial recrystallization occurs after decarburization annealing, and the α and γ linear texture strength is reduced comparing to that after cold rolling; during the high temperature annealing stage, the crystal grains recrystallize, there are {111}<112>, {111}<110> mainly γ texture, and {100}<001> texture.