金属热处理 ›› 2022, Vol. 47 ›› Issue (5): 87-91.DOI: 10.13251/j.issn.0254-6051.2022.05.014

• 材料研究 • 上一篇    下一篇

乘用车用新型冷作模具钢Cr8真空气淬后的组织与性能

元莎, 周乐育, 蒋鹏, 张建波, 陈浩   

  1. 北京机电研究所有限公司, 北京 100083
  • 收稿日期:2022-02-28 修回日期:2022-03-26 出版日期:2022-05-25 发布日期:2022-06-16
  • 通讯作者: 周乐育,博士生导师,研究员,博士,E-mail: zhouleyu@ustb.edu.cn
  • 作者简介:元 莎(1990—),女,博士研究生,主要研究方向为冷作模具钢,E-mail: 741916485@qq.com。
  • 基金资助:
    国家重点研发计划(2020YFB2010300)

Microstructure and properties of new-type Cr8 cold working die steel used in passenger cars after vacuum gas quenching

Yuan Sha, Zhou Leyu, Jiang Peng, Zhang Jianbo, Chen Hao   

  1. Beijing Research Institute of Mechanical and Electrical Technology Ltd., Beijing 100083, China
  • Received:2022-02-28 Revised:2022-03-26 Online:2022-05-25 Published:2022-06-16

摘要: 采用硬度计、光学显微镜和扫描电镜等对比分析了国产HNC53和日本KD11max两种Cr8型冷作模具钢真空气淬处理后的组织和性能,并分析了两种钢热处理前后的碳化物演变规律对性能的影响。结果表明,由于HNC53钢降低了P、S含量,控制在标准范围内,与KD11max钢相比原始组织中大块状共晶碳化物尺寸变小,且均匀分布在基体中;两种钢在1030 ℃真空气淬+520 ℃高温回火之后组织为马氏体和大颗粒状共晶碳化物及细小二次析出碳化物,与热处理前相比大块状共晶碳化物颗粒尺寸减小,数量减少;520 ℃回火后HNC53钢中析出较多的二次碳化物颗粒,均匀分布在马氏体基体上。HNC53钢与KD11max钢的硬度和韧性相差不大。

关键词: Cr8冷作模具钢, 碳化物, 硬度, 二次碳化物

Abstract: Comparative analysis was carried out on microstructure and mechanical properties of the two kind of Cr8 cold working die steel of domestic HNC53 and Japanese KD11max by means of hardness tester, metallographic microscope and SEM. The influence of carbide evolution on mechanical properties of the tested steels before and after heat treatment was analyzed. The results show that the content of P and S in HNC53 steel is within standard range. Compared with the KD11max steel, the massive eutectic carbide particles in the original microstructure of the HNC53 steel become smaller and more evenly distributed in the matrix. When vacuum gas quenched at 1030 ℃ and tempered at 520 ℃, the microstructure of the two steels is composed of martensite, large eutectic carbides and fine secondary precipitated carbides, compared with before heat treatment, the size and quantity of massive eutectic carbides are smaller and fewer. After tempering at 520 ℃, there are more precipitated secondary carbide particles in the HNC53 steel evenly distributed on the martensite matrix. Compared with KD11max steel, HNC53 steel has little difference in hardness and toughness.

Key words: Cr8 cold working die steel, carbides, hardness, secondary carbides

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