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李亮军1，方琪2，任慧平1，金自力1，仇彦会2
( 1．内蒙古科技大学材料与冶金学院，包头014010; 2．内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室，包头014010)
关键词: 稀土; 奥氏体晶粒; 第二相粒子
中图分类号: TG113 文献标识码: A
摘要: 钢中奥氏体晶粒越细小，经过组织转变后组织的力学性能越好．利用Gleeble － 1500D 热模拟机模拟稀土高Nb 钢热处理过程，并对试样进行TEM 观察与分析，研究稀土对加热时不同保温时间奥氏体晶粒大小的影响．结果表明: 稀土能有效抑制加热过程中奥氏体晶粒长大，具有调整晶粒稳定性的作用，并且稀土降低沉淀相溶解的温度，促进第二相粒子在奥氏体中的溶解．
Influence of rare earth on Austenite grain growth behavior in high Nb steel
LI Liang-jun1，FANG Qi2，REN Hui-ping1，JIN Zi-li1，QIU Yan-hui2
( 1． Materials and Metallurgy School，Inner Mongolia University of Science and Technology，Baotou，014010; 2 Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources，Inner Mongolia University of Science and Technology，Baotou 014010，China)
Key words: rare earth; austenite grain; second-phase precipitation
Abstract: The comprehensive performance of the small Austenite grain becomes better after organization change in cooling process． The simulation of heat treatment of high Nb steel was carried out by the Gleeble － 1500D thermo-mechanical experiment and the tested steel was studied using TEM to obtain the effect of rare earth on austenite grain size in different holding time．The results show that the rare earth can effectively inhibit the heating process of austenitic grain growth，and adjust with grain stability． In addition，the rare earth can reduce the precipitation dissolution temperature and promote the dissolution of 2nd-phase particles in Austenite．