ABSTRACT

A comparative study of precipitates, microstructure, texture and magnetic properties between conventional and Nb-bearing grain oriented silicon steel was carried out. The results show that fine and dispersed Nb-bearing particles are formed in Nb-bearing steel and show stronger pinning force during the whole heat treatment process, which makes a significant effect on the microstructure and texture evolution during the preparation process. Compared to conventional grain oriented silicon steel, Nb-bearing steel exhibits finer microstructure and possesses more Goss grains in hot-rolled band and normalized band. In primary recrystallized band, fine and uniform microstructure is presented in Nb-bearing steel, meanwhile, it is also characterized by strong γ-fiber and {114}<481> texture. After final annealing, Nb-bearing steel shows better magnetic properties, B₈₀₀=1.87 T and P_1.7/50=1.25 W kg^-1. In summary, niobium can be used as an effective inhibitor formation element to produce high quality Nb-bearing grain oriented silicon steel manufactured by low-temperature slab reheating process.

摘要

对常规取向硅钢与含铌取向硅钢的析出物、显微组织、织构和磁性能进行了对比研究。结果表明，在整个热处理过程中，含铌钢中形成了细小分散的含铌颗粒，并表现出更强的钉扎力，这对制备过程中的显微组织和织构演变产生了显着影响。与传统的取向硅钢相比，含铌钢具有更细的组织，在热轧带和正火带中具有更多的高斯晶粒。在一次再结晶带中，含铌钢呈现细小均匀的显微组织，同时还具有强γ纤维和{114}<481>织构的特点。最终退火后，B ₈₀₀ =1.87 T 和P _1.7/50 =1.25 W kg ^-1。综上所述，铌可作为一种有效的抑制剂形成元素，用于生产采用低温板坯再加热工艺制造的优质含铌取向硅钢。