基于加工图的高硅钢温轧制工艺的研究.pdfVIP

基于加工图的高硅钢温轧制工艺的研究 ·1 · 基于加工图的高硅钢温轧制工艺的研究 程知松 魏 来 蔡庆伍 李 萧 （北京科技大学冶金工程研究院，北京 100083 ） 摘 要 通过热模拟实验研究高硅钢在变形温度400~650 ℃，应变速率0.001~10s− 1 下的中温塑性，作出其流变应力 本构方程，得到其平均变形激活能Q = 446.05kJ/mol，同时绘制出应变为0.2 和0.3 时的加工图。从图上可以看出， 在 620~650℃、应变速率5~10s− 1 时，处于加工图上的峰值区，功率耗散率达0.23，具备最佳的加工条件。进一步 观察压缩试样的显微组织以及通过实验室温轧验证，确定在此工艺参数组合下能够得到板形良好、无裂纹的温轧板。 关键词 高硅钢，温轧，加工图 Warm Rolling Process of High Silicon Steel Based on Processing Map Cheng Zhisong, Wei Lai, Cai Qingwu, Li Xiao (Metallurgical Engineering Institute, University of Science and Technology Beijing, Beijing 100083, China) Abstract The hot deformation behaviors of High silicon steel have been studied by hot compression test at 400~650℃ and at the strain rates of 0.001~10s− 1. The peak flow stress during hot compression was modeled by a hyperbolic sine constitutive equation and an average deformation activation energy of 446.05kJ/mol was calculated. The processing map of strain 0.2 0.3 were analyzed according to the dynamic materials model. The results showed that the optimal deformation processing parameters were the temperature range of 620~650℃ and the strain rate range of 5~10s− 1, with a peak efficiency of power dissipation of 0.23. Furthermore, the deformed microstructures were observed, and the process was validated by warm-rolling. High silicon steel with the thickness of 0.52mm, bright surface, few edge cracks can be successfully fabricated under the combination of process parameters. Key words high silicon steel, warm rolling, processing map 高硅钢是一种优异的软磁材料，具有磁导率高、铁损小、磁滞伸缩系数趋于零等特点，主要用在中高频 的电动机、变压器以及高频扼流线圈和电抗器的铁芯材料、屏蔽材料[1] 。但是由于高硅钢是层错能高的体心 立方（BCC ）结构材料，其中存在大量的有序相B2 和DO3 ，导致其室温脆性极大，几乎没有塑性，难以通