奥氏体不锈钢中液析碳化物在高温均匀化过程中的演化  

Evolution of primary NbC in austenitic stainless steel during high temperature homogenization

作　　者：徐海涛[1] 燕春光 张舒展 史显波[2] 严伟[2] 姜海昌[2] XU Haitao;YAN Chunguang;ZHANG Shuzhan;SHI Xianbo;YAN Wei;JIANG Haichang(China Institute of Atomic Energy,Beijing 102413,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]中国原子能科学研究院,北京102413 [2]中国科学院金属研究所,沈阳110016

出　　处：《压力容器》2022年第4期9-16,共8页Pressure Vessel Technology

基　　金：国家自然科学基金项目(51971226)。

摘　　要：利用激光高温共聚焦显微镜对铸态奥氏体不锈钢中的液析NbC在1200~1300℃高温均匀化过程中的演化行为进行了原位分析,研究结果表明:由于在凝固过程中Nb元素的偏析,导致液析NbC周围基体的液相线温度降低,在高温均匀化过程中产生局部液相,提高了高温扩散动力;1250℃高温均匀化处理可以有效改善液析NbC的形貌和尺寸,是高温均匀化的最佳温度。The evolution of primary NbC in as-cast austenitic stainless steel during high temperature homogenization at 1200~1300℃was analyzed in-situ by high temperature laser scanning confocal microscopy.The results show that due to the segregation of Nb element in the solidification process,the melting temperature of the matrix around the primary NbC decreased.Local liquid phase is generated in the high temperature homogenization process,hence the high temperature diffusion power is improved.The morphology and size of the primary NbC are considerably improved by high temperature homogenization at the 1250℃,which is the best temperature for homogenization.

关 键 词：奥氏体不锈钢 液析NbC 高温均匀化 原位观察 

分 类 号：TH142.2[一般工业技术—材料科学与工程] TG142.25[机械工程—机械制造及自动化]