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对3%无取向硅钢进行异步轧制以实现表面纳米化,分别在真空和渗硅条件下进行不同参数的热处理,研究显微组织、物相和成分的演变.结果表明:经过速比为1.31,轧制道次为20,总压下量为91%的异步轧制后,板材表面形成了尺寸为10~20 nm,取向呈随机分布的纳米晶;在真空下升温,表面纳米晶的再结晶温度明显提高;在渗硅剂(Si粉+1%(质量分数)卤化物)中升温,表面纳米晶的再结晶温度因外部Si原子沿着缺陷的快速扩散而进一步提高,使得纳米晶界面能够在更高的温度下(750℃)发挥扩散通道作用,促进Si原子的扩散,并在显著地降低保温时间和(作为催化剂的)卤化物含量的同时获得致密的渗Si层.
The 3% non-oriented silicon steel was subjected to asynchronous rolling to achieve the surface nanocrystallization. The heat treatment under different conditions of vacuum and silicon infiltration was carried out to study the evolution of microstructure, phase and composition. The results showed that after the speed ratio of 1.31 , Rolling pass 20, the total reduction of 91% of the total amount of rolling after the formation of the plate surface size of 10 ~ 20 nm, the orientation was random distribution of nanocrystals; under vacuum heating, the surface nanocrystalline and then The temperature of crystallization increases obviously; the temperature of recrystallization of surface nanocrystals increases with the addition of Si atoms (Si powder + 1% (mass fraction)) due to the rapid diffusion of external Si atoms along the defects, making the nanocrystalline interface Can act as diffusion channels at higher temperatures (750 ° C), promote the diffusion of Si atoms, and obtain a dense Si-infiltrating layer while significantly reducing the holding time and the halide content (as a catalyst).