摘要
采用光学显微镜、扫描电镜、硬度计、冲击试验机、万能拉伸试验机研究了U75V重轨钢轧态及淬火冷速为3℃/s和5℃/s条件下的微观组织、力学性能及断口形貌。结果表明:随着淬火冷速的增加,U75V钢的晶粒逐渐细化,珠光体片层间距减小,其中,轧态U75V钢的晶粒和片层间距最大,而5℃/s淬火冷速的U75V钢晶粒和片层间距最小;随着淬火冷速的增加,U75V钢的冲击吸收能量、硬度等综合力学性能增加。其中,轧态U75V钢轨的冲击吸收能量、硬度及抗拉强度最小,而5℃/s淬火冷速的U75V钢冲击吸收能量、硬度最优且抗拉强度较好。
Microstructure,mechanical properties and fracture morphology of U75 V heavy rail steel as rolled and as quenched at 3℃/s and5℃/s were studied by optical microscope,scanning electron microscope,hardness tester,impact testing machine and universal tensile testing machine.The results show that with the increase of quenching rate,the grain size of the steel is refined gradually,and the pearlite lamellar spacing decreases.Among them,the grain size and lamellar spacing of the steel as rolled are the largest,and that as quenched at5℃/s are the smallest.Meanwhile,the comprehensive mechanical properties such as impact absorbed energy and hardness of the U75 V steel are increased.Among them,the impact absorbed energy,hardness and tensile strength of the steel as rolled are the lowest,and that as quenched at 5℃/s are the best.
作者
马潇
岑耀东
陈林
吴茂文
Ma Xiao;Cen Yaodong;Chen Lin;Wu Maowen(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou Inner Mongolia 014010,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第12期59-62,共4页
Heat Treatment of Metals
基金
内蒙古自然科学基金(2019LH05016)
内蒙古自治区高等学校科学技术研究项目(NJZY20089)
内蒙古自治区科技重大专项(ZDZX2018024)
内蒙古科技大学创新基金(2019QDL-B06)
内蒙古自治区科技创新引导项目“第三代高强度重载耐磨热处理钢轨关键技术研究及应用”。
关键词
U75V重轨钢
淬火
组织
力学性能
U75V heavy rail steel
quenching
microstructure
mechanical properties
作者简介
马潇(1996-),男,硕士研究生,主要研究方向为钢轨的组织及疲劳性能控制,E-mail:446933255@qq.com;通讯作者:陈林,教授,硕士,E-mail:chenlin39805@163.com。
