U77CrNb钢轨钢连续冷却转变曲线研究  

Study on continuous cooling transformation curves of rail steel U77CrNb

作　　者：朱敏[1,2] 徐光[1] 王瑞敏[2] 刘文艳[2] 

机构地区：[1]武汉科技大学材料与冶金学院,湖北武汉430081 [2]武汉钢铁(集团)公司研究院,湖北武汉430080

出　　处：《钢铁研究》2016年第2期29-31,共3页Research on Iron and Steel

基　　金：武汉市科技计划资助项目(2013011403010505)

摘　　要：在Formastor-F试验机上进行热模拟试验,测定了U77CrNb钢轨钢临界点及在0.2~30℃/s冷却速度下连续冷却转变的温度膨胀曲线。试验结果表明：冷却速度≤1℃/s时,可获得屈氏体＋珠光体组织;冷却速度达到2℃/s时,钢中出现马氏体组织。测定的连续冷却转变曲线为制定U77CrNb钢轨钢生产及热处理工艺提供了理论依据。The critical points and continuous cooling temperature dilation curves within cooling rate 0. 2-30 ℃ / s of U77CrNb rail steel were measured by Formastor-F hot simulation machine. Results showed that：the microstructure of U77CrNb rail steel was troostite and perlite when the cooling rate was less than or equal to 0. 1 ℃ / s,and the microstructure of martensite was observed when the cooling rate was up to2 ℃ / s. The continuous cooling transformation curves obtained can provide a theoretical basis for optimization manufacture and heat treatment process of U77CrNb rail steel.

关 键 词：U77CrNb 钢轨钢 连续冷却转变曲线 

分 类 号：TG156.1[金属学及工艺—热处理]