重轨钢的组织演变及热变形行为

doi:10.13251/j.issn.0254-6051.2020.11.008

金属热处理 ›› 2020, Vol. 45 ›› Issue (11): 38-42.DOI: 10.13251/j.issn.0254-6051.2020.11.008

重轨钢的组织演变及热变形行为

岑耀东, 陈林, 董瑞, 包喜荣, 娄梦杰

内蒙古科技大学材料与冶金学院, 内蒙古包头 014010

收稿日期:2020-04-22 出版日期:2020-11-25 发布日期:2020-12-29
通讯作者: 陈林,教授,E-mail: chenlin39805@163.com
作者简介:岑耀东(1982—),男,讲师,硕士生导师,博士,主要研究方向为金属材料加工过程的组织、残余应力、应变性能控制及金属材料的疲劳寿命和安全性评估,E-mail: cydtgyx@163.com。
基金资助:
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

Microstructure evolution and hot deformation behavior of a heavy rail steel

Cen Yaodong, Chen Lin, Dong Rui, Bao Xirong, Lou Mengjie

School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China

Received:2020-04-22 Online:2020-11-25 Published:2020-12-29

摘要/Abstract

摘要： 采用Gleeble-1500D热模拟试验机,在变形温度分别为850、900、930、950 ℃,变形量为30%、50%、70%的条件下对一种与BGRE钢相近的GGX-G试验用重轨钢进行热模拟试验和不同分阶段冷却工艺试验,采用光学显微镜(OM)和扫描电镜(SEM)观察变形温度和变形量对重轨钢组织和珠光体片层间距的影响。结果表明:在变形温度一定时(850 ℃、900 ℃),珠光体片层间距随着变形量的增大而减小,并且所有试样的片层间距能细化到50~80 nm;当第一阶段冷速V₁=5 ℃/s,第二阶段冷速V₂=2 ℃/s,并在第一阶段冷却过程中于650 ℃保温3 min时,钢轨的珠光体片层平直,片层间距能达到74.8 nm。

关键词: 重轨钢, 热模拟, 组织, 热变形

Abstract: A GGX-G heavy rail steel similar to the BGRE steel was compressively deformed for 30%, 50% and 70% at 850, 900, 930, 950 ℃ respectively by Gleeble-1500D thermal simulation testing machine, and then undergone stepped cooling at different cooling rates. The effects of deformation temperature and deformation amount on the microstructure and pearlite interlamellar spacing of the steel were analyzed by means of OM and SEM. The results show that when the deformation temperature is kept constant (850 ℃ or 900 ℃), the pearlite interlamellar spacing decreases with the increase of deformation amount, which can be refined in the range of 50-80 nm for all the specimens. For the stepped cooling, when the first cooling rate V₁=5 ℃/s, the second cooling rate V₂=2 ℃/s, and holding 3 min at 650 ℃ during the first stepped cooling, the pearlite lamella of the steel is straight and the interlamellar spacing can reach 74.8 nm.

Key words: heavy rail steel, thermal simulation, microstructure, hot deformation

中图分类号:

TG111

岑耀东, 陈林, 董瑞, 包喜荣, 娄梦杰. 重轨钢的组织演变及热变形行为[J]. 金属热处理, 2020, 45(11): 38-42.

Cen Yaodong, Chen Lin, Dong Rui, Bao Xirong, Lou Mengjie. Microstructure evolution and hot deformation behavior of a heavy rail steel[J]. Heat Treatment of Metals, 2020, 45(11): 38-42.

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重轨钢的组织演变及热变形行为

Microstructure evolution and hot deformation behavior of a heavy rail steel

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