U76CrRE稀土钢轨连续冷却曲线和组织性能研究  

Determination of CCT Curve and Analysis of Microstructure and Properties of U76CrRE Rare Earth Rail

作　　者：王立新[1] 李智丽[2] 彭军[1] 智建国[2] 

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]包头钢铁(集团)公司技术中心,内蒙古包头014010

出　　处：《稀土》2017年第1期85-89,共5页Chinese Rare Earths

摘　　要：用Formastor-F型热膨胀仪测定了U76CrRE钢的CCT曲线;研究了冷却速率对钢组织和硬度的影响。结果表明,U76CrRE钢发生珠光体转变的临界冷速为2.00℃/s;当冷速小于等于2.00℃/s时,得到的组织为珠光体和少量铁素体;当冷速大于2.00℃/s时,转变产物中出现马氏体;实验钢的硬度随冷速的增加而增大。U76CrRE稀土钢轨在温度略高于522℃进行等温转变时可获得片间距细小的珠光体组织,硬度可满足热处理钢轨的性能要求。Determination of curves-CCT of U76CrRE rail steel was conducted by using Formastor-F thermal expansion instrument. The effects of cooling rate on the microstructure and hardness of rail steel were studied. The results show that the critical cooling rate of U76CrRE transformed to pearlite is 2. 00℃ / s. The microstructure is pearlite and little ferrite when the cooling rate is no greater than 2. 00℃ / s. The products of austenitic transformation include Martensite when the cooling rate is greater than 2. 00℃ / s. The hardness of the steel increases with the increase of cooling rate. The pearlitic lamellar spacing of U76 CrRE rare earth rail is the most fine when isothermal temperatures is slightly higher than 522℃. The hardness can meet the performance requirements of rail.

关 键 词：U76CrRE钢 CCT曲线 显微组织 硬度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]