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利用单相奥氏体及晶界碳化物＋奥氏体的两种 １５Ｃｒ－２５Ｎｉ不锈钢，研究了晶界碳化物对室温及８６０℃拉伸性能的影响。结果表明，室温下晶界碳化物对屈服强度几乎没有影响，但提高了抗拉强度约１４％，降低材料塑性（断面收缩率）约３８％，在８５０℃，晶界碳化物对抗拉强度没有影响，但提高了村料的塑性，其延伸率反断面收缩率分别提高约７０％和５８％，探讨了晶界碳化物影响拉伸性能的机制，室温下由于碳化物与基体界面结构与晶界结构不同导致与位错的不同交互作用，在高温下则是晶界碳化物阻碍晶界的滑移。
The effects of grain boundary carbides on the tensile properties at room temperature and 860 ℃ were studied by using two kinds of 15Cr-25Ni stainless steels with single-phase austenite, grain boundary carbides and austenite. The results show that the grain boundary carbides have almost no effect on the yield strength at room temperature, but increase the tensile strength by about 14% and reduce the plasticity (reduction by area) by about 38%. At 850 ℃, the grain boundary carbides have no effect on the tensile strength However, the plasticity of the village material is improved, and the elongation at break of the fracture surface increases by about 70% and 58% respectively. The mechanism of the effect of the grain boundary carbide on the tensile property is discussed. Because of the interfacial structure between the carbide and the substrate and the crystal Different boundary structures lead to different interactions with dislocations, and at high temperature, grain boundary carbides block the slip of grain boundaries.