热处理工艺对离心铸造高铬铸铁轧辊组织及硬度的影响

doi:10.13251/j.issn.0254-6051.2020.02.021

金属热处理 ›› 2020, Vol. 45 ›› Issue (2): 108-113.DOI: 10.13251/j.issn.0254-6051.2020.02.021

热处理工艺对离心铸造高铬铸铁轧辊组织及硬度的影响

曹宇, 宋新莉, 郑爱琴, 陈荣东, 贾涓, 毕云杰

武汉科技大学耐火材料与冶金国家重点实验室, 武汉湖北 430081

收稿日期:2019-08-20 出版日期:2020-02-25 发布日期:2020-04-03
通讯作者: 宋新莉,女,博士,教授,E-mail:xlsong@wust.edu.cn
作者简介:曹宇(1995—),男,硕士研究生,主要从事高强钢强塑性的研究,联系电话:18671750658,E-mail:1349812402@qq.com。
基金资助:
国家重点研发计划(2017YFB0305100)

Effect of heat treatment process on microstructure and hardness of high chromium cast iron roller produced by centrifuge casting

Cao Yu, Song Xinli, Zhen Aiqin, Chen Rongdong, Jia Juan, Bi Yunjie

State Key Laboratory of Refractory Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan Hubei 430081, China

Received:2019-08-20 Online:2020-02-25 Published:2020-04-03

摘要/Abstract

摘要：

采用了光学显微镜、扫描电镜、X射线衍射仪、洛氏硬度计等仪器,研究了离心铸造高铬铸铁轧辊铸态及淬火与回火后的显微组织结构、碳化物和硬度等。结果表明:高铬铸铁轧铸态组织主要是由奥氏体+少量马氏体+(Cr,Fe)₇C₃碳化物组成,碳化物呈粗大板条状或块状,不同温度热处理后,得到回火马氏体+(Cr,Fe)₇C₃+Cr₇C₃碳化物的组织,组织中粗大板条状碳化物消失,得到细小块状或椭圆状碳化物。该高铬铸铁轧辊铸态硬度为56.0HRC左右,在950℃淬火及400℃回火处理后硬度增加到了约65.5HRC。

关键词: 高铬铸铁轧辊, 热处理, 碳化物, 硬度

Abstract:

Microstructure, carbides and hardness of high chromium cast iron roller as-cast by centrifuge casting and quenched and tempered were studied by optical microscope, scanning electron microscope, X-ray diffractometer and Rockwell hardness tester. The results show that the microstructure of the roller as cast is mainly composed of austenite and a few martensite and coarse plate or blocky (Cr, Fe)₇C₃ carbide. After heat treatment at different temperatures, tempered martensite and (Cr, Fe)₇C₃ and Cr₇C₃ carbides are obtained, and the plate-like carbides are replaced by fine block or elliptical ones. The hardness of the as-cast high chromium roller is 56.0 HRC, then increases to about 65.5 HRC after 950 ℃ quenching +400 ℃ tempering.

Key words: high chromium cast iron roller, heat treatment, carbide, hardness

中图分类号:

TG143.1

曹宇, 宋新莉, 郑爱琴, 陈荣东, 贾涓, 毕云杰. 热处理工艺对离心铸造高铬铸铁轧辊组织及硬度的影响[J]. 金属热处理, 2020, 45(2): 108-113.

Cao Yu, Song Xinli, Zhen Aiqin, Chen Rongdong, Jia Juan, Bi Yunjie. Effect of heat treatment process on microstructure and hardness of high chromium cast iron roller produced by centrifuge casting[J]. HTM, 2020, 45(2): 108-113.

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热处理工艺对离心铸造高铬铸铁轧辊组织及硬度的影响

Effect of heat treatment process on microstructure and hardness of high chromium cast iron roller produced by centrifuge casting

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