U76CrRE重轨钢热处理工艺优化及力学性能分析

doi:10.13251/j.issn.0254-6051.2022.11.010

金属热处理 ›› 2022, Vol. 47 ›› Issue (11): 64-69.DOI: 10.13251/j.issn.0254-6051.2022.11.010

U76CrRE重轨钢热处理工艺优化及力学性能分析

王业双¹, 刘馨宇¹, 苏航², 段亚楠¹, 岑耀东¹, 陈林¹

1.内蒙古科技大学材料与冶金学院(稀土学院), 内蒙古包头 014010;
2.内蒙古包钢钢联股份有限公司包钢技术中心, 内蒙古包头 014010

收稿日期:2022-06-03 修回日期:2022-09-06 出版日期:2022-11-25 发布日期:2023-01-04
通讯作者: 陈林,教授,E-mail:chenlin39805@163.com
作者简介:王业双(1995—),男,硕士研究生,主要研究方向为重载钢轨组织性能控制及其疲劳行为,E-mail:1473066380@qq.com。
基金资助:
内蒙古科技大学创新基金 (2019QDL-B06)

Optimization of heat treatment process and analysis of mechanical properties of U76CrRE heavy rail steel

Wang Yeshuang¹, Liu Xinyu¹, Su Hang², Duan Yanan¹, Cen Yaodong¹, Chen Lin¹

1. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
2. Baotou Steel Technology Center, Inner Mongolia Baotou Steel Co., Ltd., Baotou Inner Mongolia 014010, China

Received:2022-06-03 Revised:2022-09-06 Online:2022-11-25 Published:2023-01-04

摘要/Abstract

摘要： 通过在连续冷却的在线热处理工艺基础上进行工艺优化,研究了等温处理工艺对U76CrRE重轨钢微观组织和力学性能的影响。结果表明,相变前的冷却速度、等温温度和等温时间共同影响U76CrRE重轨钢的组织和力学性能。在相变前8 ℃/s的最佳冷却速度下,等温温度越低、等温时间越短,获得的珠光体越细小;U76CrRE重轨钢的抗拉强度随着等温温度的降低、等温时间的缩短而增大;560 ℃×30 s等温处理是U76CrRE重轨钢的最优热处理工艺,其综合力学性能最好,抗拉强度为1370 MPa,硬度为390 HBS,断后伸长率为9.33%,断面收缩率为41.32%,冲击吸收能量为4.4 J。

关键词: 等温处理, U76CrRE重轨钢, 工艺优化, 显微组织, 力学性能

Abstract: Effect of isothermal treatment process on microstructure and mechanical properties of the U76CrRE heavy rail steel was studied by optimizing the process based on the on-line heat treatment with continuous cooling. The results show that the cooling rate before phase transformation, isothermal temperature and isothermal time jointly affect microstructure and mechanical properties of the U76CrRE heavy rail steel. At the optimum cooling rate of 8 ℃/s before phase transformation, the lower the isothermal temperature and the shorter the isothermal time, the finer the pearlite structure obtained. The tensile strength of the U76CrRE heavy rail steel increases with the decrease of isothermal temperature and isothermal time. Isothermal treatment at 560 ℃ for 30 s is the optimum heat treatment process for the U76CrRE heavy rail steel, under which the comprehensive mechanical properties are the best, the tensile strength is 1370 MPa, the hardness is 390 HBS, the elongation after fracture is 9.33%, the percentage reduction of area is 41.32%, and the impact absorbed energy is 4.4 J.

Key words: isothermal treatment, U76CrRE heavy rail steel, process optimization, microstructure, mechanical properties

中图分类号:

TG156.1

王业双, 刘馨宇, 苏航, 段亚楠, 岑耀东, 陈林. U76CrRE重轨钢热处理工艺优化及力学性能分析[J]. 金属热处理, 2022, 47(11): 64-69.

Wang Yeshuang, Liu Xinyu, Su Hang, Duan Yanan, Cen Yaodong, Chen Lin. Optimization of heat treatment process and analysis of mechanical properties of U76CrRE heavy rail steel[J]. Heat Treatment of Metals, 2022, 47(11): 64-69.

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U76CrRE重轨钢热处理工艺优化及力学性能分析

Optimization of heat treatment process and analysis of mechanical properties of U76CrRE heavy rail steel

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