中文摘要：

测量了普通取向电工钢室温至300℃的拉伸性能并观察了拉伸断口形貌．对比分析和定量计算表明，随着拉伸温度的升高P原子在晶界偏聚的程度逐渐降低，使得断口形貌的沿晶特征减弱、解理特征增强．拉伸温度超过100℃以后沿晶断裂特征消失，基体的屈服强度逐渐低于解理强度，使得断口形貌解理特征减弱、韧窝特征增强，至190℃转变成完全的韧窝断口．在100℃-160℃范围内拉伸变形时位错滑移会拖曳柯垂尔气团随之迁移，造成了随温度升高延伸率下降，且屈服强度的降幅减缓．

英文摘要：

Tensile properties of grain-oriented electrical steels up to 300 ℃ were investigated and the corresponding fractography characteristics were observed. It was found that the segregation of phosphor atoms on grain boundaries was decreased with increasing tensile temperature, which resulted in enhancing cleavage fractography with reducing intergranular fracture. The intergranular fracture disappeared at the temperature over 100 ℃, while the yield strength of the matrix became obviously lower than its cleavage strength, which led to reducing cleavage fractography with enhancing dimples fracture that prevailed at 190 ℃. The Cottrell atmosphere would be trailed by the moving dislocations during the tensile deformation between 100-160℃, which induced decreasing elongation and limited yield strength drop with increasing deformation temperature.