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在Thermo-Calc软件模拟计算的基础上,采用透射电子显微镜和扫描电子显微镜对S30432钢700℃持久后的析出相特别是σ相进行分析,并研究其对持久塑性的影响.结果表明:S30432钢700℃持久后除存在富铜相、MX相和M23C6外,持久4 363h后在晶界析出块状的σ相;随着持久时间延长,σ相数量增加并粗化;晶界析出的块状σ相促使空洞形核和裂纹发展,对4 363~6 234h阶段持久塑性的骤降产生重要影响.
Based on the simulation results of Thermo-Calc software, transmission electron microscopy and scanning electron microscopy were used to analyze the precipitated phase, especially sigma phase, of S30432 steel at 700 ℃, and the effect on permanent ductility was also studied.The results show that: S30432 steel At 700 ℃, in addition to Cu-rich phase, MX-phase and M23C6, after lasting for 4363h, massive σ phase precipitated in the grain boundary. With the extension of the lasting time, the number of σ-phase increased and coarsened. The σ phase promotes the nucleation and crack growth of cavities, which has an important influence on the plunge of ductile plasticity during 4 363 ~ 6 234 h.