热疲劳对B/M复相H13钢组织及力学性能的影响

doi:10.13251/j.issn.0254-6051.2020.08.004

金属热处理 ›› 2020, Vol. 45 ›› Issue (8): 17-21.DOI: 10.13251/j.issn.0254-6051.2020.08.004

热疲劳对B/M复相H13钢组织及力学性能的影响

李洋城, 程晓农, 罗锐, 韦家波, 张洁, 高天明

江苏大学材料科学与工程学院, 江苏镇江 212013

收稿日期:2020-01-19 出版日期:2020-08-25 发布日期:2020-09-07
通讯作者: 程晓农,教授,博士,E-mail: xncheng@mail.ujs.edu.cn
作者简介:李洋城(1995—),男,硕士研究生,主要研究方向为热作模具钢热疲劳性能,E-mail:782690846@qq.com
基金资助:
江苏省重点研发计划(产业前瞻与共性关键技术)(BE2017127);“十二五”国家高技术研究发展计划(863计划)重大项目(2012AA03A501)

Effect of thermal fatigue on microstructure and mechanical properties of B/M multiphase H13 steel

Li Yangcheng, Cheng Xiaonong, Luo Rui, Wei Jiabo, Zhang Jie, Gao Tianming

School of Materials Science and Engineering, Jiangsu University, Zhengjiang Jiangsu 212013, China

Received:2020-01-19 Online:2020-08-25 Published:2020-09-07

摘要/Abstract

摘要： 为提高其热疲劳性能,对H13钢进行了贝氏体-马氏体(B/M)复相热处理,使其得到了由回火索氏体和贝氏体组成的复相组织。利用OM、SEM、TEM、洛氏硬度计、万能拉伸试验机等设备研究了热疲劳对B/M复相H13钢微观组织、碳化物及力学性能的影响。结果表明:较传统H13钢硬度随疲劳次数增加而迅速降低的现象,B/M复相H13钢的硬度随疲劳次数的增加呈先下降后上升再下降的趋势。拉伸试验表明,较传统H13钢,B/M复相H13钢的强塑性配合更加优异,且在热疲劳后,其断面收缩率反而有所增大。通过显微组织观察发现力学性能变化的主要原因是B/M复相H13钢在热疲劳过程中存在贝氏体板条合并及碳化物析出并长大粗化的行为。

关键词: B/M复相H13钢, 热疲劳, 碳化物, 力学性能

Abstract: In order to improve its thermal fatigue property, H13 steel was B/M multiphase heat treated to obtain a tempered sorbite+bainite multiphase microstructure. The effect of thermal fatigue on the microstructure, carbide and mechanical properties of the B/M multiphase H13 steel was investigated by means of OM, SEM, TEM, Rockwell hardness tester and universal tensile testing machine. The results show that contrast to the phenomenon of rapid decrease of hardness with the increase of fatigue circle for the traditional H13 steel, the hardness of B/M multiphase H13 steel decreases first and then rises and then decreases with the increase of fatigue circle. The tensile experiments show that the strength-plasticity cooperating of the B/M multiphase H13 steel is better than that of the traditional H13 steel, and its percentage reduction of area increases after the thermal fatigue. It is found from microscopic observation that the main reason for the change in mechanical properties is the bainite lath merging and carbide precipitation and coarsening in the B/M multiphase H13 steel during thermal fatigue.

Key words: B/M multiphase H13 steel, thermal fatigue, carbide, mechanical properties

中图分类号:

TG142.1

李洋城, 程晓农, 罗锐, 韦家波, 张洁, 高天明. 热疲劳对B/M复相H13钢组织及力学性能的影响[J]. 金属热处理, 2020, 45(8): 17-21.

Li Yangcheng, Cheng Xiaonong, Luo Rui, Wei Jiabo, Zhang Jie, Gao Tianming. Effect of thermal fatigue on microstructure and mechanical properties of B/M multiphase H13 steel[J]. Heat Treatment of Metals, 2020, 45(8): 17-21.

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热疲劳对B/M复相H13钢组织及力学性能的影响

Effect of thermal fatigue on microstructure and mechanical properties of B/M multiphase H13 steel

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