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本文研究了护环用奥氏体不锈钢1Mn18Cr18N在不同热处理过程中晶界析出碳化物与冲击/拉伸性能的关系,并借助扫描电镜和透射电镜对热处理过程中的碳化物的微观结构、冲击及拉伸断口进行了观察与分析。结果表明:奥氏体不锈钢1Mn18Cr18N经过热处理后,晶界的析出相为M23C6碳化物,它导致界面结合强度降低,从而引起冲击吸收能量和塑性降低,断裂模式由韧性断裂转变为脆性断裂。
In this paper, the relationship between carbide precipitation and tensile / tensile properties at the grain boundary in 1Mn18Cr18N austenitic stainless steel for retaining ring was investigated. The microstructure and impact of carbides in the heat treatment were analyzed by scanning electron microscope and transmission electron microscope. Tensile fracture was observed and analyzed. The results show that the precipitated phase of the austenitic stainless steel 1Mn18Cr18N is M23C6 carbides after heat treatment, which leads to the decrease of the bonding strength of the interface and the decrease of the energy and ductility of shock absorption. The fracture mode changes from ductile fracture to brittle fracture.