4Cr5Mo2VCo钢的热处理工艺优化

doi:10.13251/j.issn.0254-6051.2022.04.021

金属热处理 ›› 2022, Vol. 47 ›› Issue (4): 133-140.DOI: 10.13251/j.issn.0254-6051.2022.04.021

4Cr5Mo2VCo钢的热处理工艺优化

李立^1,2, 曾艳^1,2, 吴晓春^1,2

1.上海大学材料科学与工程学院省部共建高品质特殊钢冶金与制备国家重点实验室, 上海 200444;
2.上海市钢铁冶金新技术开发应用重点实验室, 上海 200444

收稿日期:2021-11-30 修回日期:2022-01-04 出版日期:2022-04-25 发布日期:2022-05-19
通讯作者: 吴晓春,教授,博士,E-mail: xcwu@staff.shu.edu.cn
作者简介:李立(1995—),男,硕士研究生,主要研究方向为热作模具钢,E-mail:nbda01015210@163.com。
基金资助:
国家重点研发计划(2016YFB030402)

Heat treatment process optimization for 4Cr5Mo2VCo steel

Li Li^1,2, Zeng Yan^1,2, Wu Xiaochun^1,2

1. State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;
2. Shanghai Key Laboratory of Advanced Ferro-Metallurgy, Shanghai 200444, China

Received:2021-11-30 Revised:2022-01-04 Online:2022-04-25 Published:2022-05-19

摘要/Abstract

摘要： 对不同工艺下4Cr5Mo2VCo钢的硬度及冲击性能进行测定,并用SEM对其显微组织和断口形貌进行了分析。结果表明,在1000~1100 ℃淬火温度范围内,4Cr5Mo2VCo钢的硬度先升高后降低,最高达59.2 HRC;未溶碳化物数量随淬火温度上升不断减少,在1100 ℃时基本全部溶入基体。回火过程中4Cr5Mo2VCo钢的二次硬化峰值温度为520 ℃,硬度随回火温度继续升高而逐渐降低。不同温度淬火试样的冲击吸收能量随回火温度的上升呈先增大后逐渐降低趋势。在44~46 HRC的硬度使用范围内,4Cr5Mo2VCo钢具有最佳强韧性配比的热处理工艺为1060 ℃×30 min淬火+(600~610) ℃×2 h回火两次,平均冲击吸收能量可达410 J。

关键词: 4Cr5Mo2VCo钢, 热处理, 微观组织, 硬度, 冲击性能

Abstract: Hardness and impact property of 4Cr5Mo2VCo steel treated by different processes were measured, and the microstructure and fracture morphology were analyzed by SEM. The results show that in the quenching temperature range of 1000-1100 ℃, the hardness of the 4Cr5Mo2VCo steel first increases and then decreases, up to 59.2 HRC. The number of undissolved carbides decreases with the increase of quenching temperature, and almost all of the carbides dissolve into the matrix at 1100 ℃. During tempering, the secondary hardening peak temperature of the 4Cr5Mo2VCo steel is 520 ℃, and the hardness decreases subsequently with the increase of tempering temperature. The impact absorbed energy of the specimens quenched at different temperatures increases firstly and then decreases gradually with the increase of tempering temperature. In the hardness ranger of 44-46 HRC, the optimum heat treatment process of the 4Cr5Mo2VCo steel is quenching at 1060 ℃ for 30 min and tempering twice at 600-610 ℃ for 2 h, under which, the average impact absorbed energy can reach 410 J.

Key words: 4Cr5Mo2VCo steel, heat treatment, microstructure, hardness, impact property

中图分类号:

TG142.1

李立, 曾艳, 吴晓春. 4Cr5Mo2VCo钢的热处理工艺优化[J]. 金属热处理, 2022, 47(4): 133-140.

Li Li, Zeng Yan, Wu Xiaochun. Heat treatment process optimization for 4Cr5Mo2VCo steel[J]. Heat Treatment of Metals, 2022, 47(4): 133-140.

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4Cr5Mo2VCo钢的热处理工艺优化

Heat treatment process optimization for 4Cr5Mo2VCo steel

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