U20Mn钢轨水-空交替控时淬火技术的中试研究  

Pilot-scale study of water-air alternative timed quenching technology for U20Mn steel rail

作　　者：左训伟[1] 张绵胜 陈乃录[1] 陈良旗 戎咏华[1] 蔡建旭 Zuo Xunwei;Zhang Miansheng;Chen Nailu;Chen Liangqi;Rong Yonghua;Cai Jianxu(School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Beijing Teye Industrial and Trade Co.,Ltd.,Beijing 100043,China)

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]北京特冶工贸有限公司,北京100043

出　　处：《金属热处理》2020年第9期50-56,共7页Heat Treatment of Metals

基　　金：国家重点研发计划(2017YFB0304500)。

摘　　要：为了提高载重钢轨的力学性能,尝试了以水-空交替控时淬火(ATQ)工艺取代传统的风冷或雾冷工艺,并以喷水淬火方式对U20Mn钢轨进行了ATQ技术(工艺+设备)的中试研究。首先通过设备和工艺的改进以及基于有限元的畸变模拟,解决了畸变导致钢轨运行受阻的难题。随后在实验室对比研究了可获得不同马氏体、贝氏体相对量的两种ATQ工艺,最终选择以可获得贝氏体为主的工艺进行中试。中试的目标为7 m长的钢轨,经ATQ工艺处理后再经260℃保温16 h或30 h回火,经检测力学性能均超过性能要求指标。In order to improve the mechanical properties of heavy-load rail,this study attempts to replace the traditional air-cooling or fogcooling processes with water-air alternating controlled quenching(ATQ),and carries out a pilot-scale study of the ATQ technology(process+equipment)for U20Mn steel rail with water spray quenching.Firstly,the problem of rail operation obstruction caused by distortion is solved through the improvement of equipment and technology and finite element simulation of the distortion,then two ATQ processes were studied in laboratory to obtain different relative quantities of martensite and bainite respectively.Finally,the bainitedominated ATQ process was selected to carry out the pilot-scale production for 7m long steel rail,and the results show that the mechanical properties of all the steel rails treated by this ATQ process with 260℃ tempering for 16h or 30h exceed the technical requirements.

关 键 词：U20Mn贝氏体钢轨 水-空交替控时淬火(ATQ)工艺 微观组织 力学性能 

分 类 号：TG156.34[金属学及工艺—热处理]