Abstract: The impact test of room temperature to 100℃ of 2. 3% Si non-oriented silicon steel normalized at 900 ~ 950℃ were carried out,and the fracture morphologies were observed by Scanning Electron Microscopy (SEM). Effects of normalizing temperature on impact toughness of 2.3% Si non-oriented silicon steel are investigated. The results show that with increasing normalizing temperature, at room temperature the ductile fracture of test steel gradually changed into brittle fracture, the impact energy of steel decreases from 21.4 J to 12.2 J, at 100℃ the impact energy of test steel normalized at 900 ~ 950℃ is 28.4 ~ 33. 2 J with ductile fracture. The inclusions at impact fracture of normalized steel are main AIN.

摘要： 对900-950℃常化处理后的2.3%Si无取向硅钢进行了室温至100℃的冲击试验,采用扫描电镜观察不同条件下的冲击断口形貌,分析了常化温度对2.3%Si无取向硅钢韧性的影响。结果表明,当冲击试验为室温时,随常化温度的升高,试验钢由韧性断裂逐渐转为脆性断裂,冲击功由21.4J降至12.2J;当冲击温度为100℃时,经900～950℃常化处理后的试验钢冲击功为28.4～33.2J,为韧性断裂;经常化处理后的冲击断口区域夹杂物主要为AlN。