微量元素对奥氏体热模钢晶界组织性能的影响

The Effects of Microelement on the Microstructure and Properties of Austenitic Hot Work Die Steel on the Grain Boundary

用俄歇能谱仪、电子显微镜和ＷＪ－１０型机械式万能材料试验机，分析了奥氏体热作模具钢的晶界成分，观察了晶界组织，测试了钢的力学性能，结果表明：微量元素硼偏聚于晶界，抑制了氧和磷的晶界内吸附，改善了晶界性能，提高了钢的高温塑性。

The composition and microstructure on the grain boundary of teh austenitic hot work diesteel are investigated by Auger electron spectroscopy(AES)and scanning electron mi-croscopy(SEM),respectively. The mechanical properties are tested with a WJ-10 typetester.The results show that the intracrystalline absorption of oxygen and phosphorus dueto the segregation of element B on the grain boundary is restrained and the properties on thegrain boundary as well as the high-temperature plasticity of the steel are improved.