Transactions of Materials and Heat Treatment

Title：Influence of vacuum gas quenching process on microstructure and properties of Cr12MoV die steel

Authors： Wang Yongjin1 Zhan Keqin1 Pei Wei2 Shao Guangbao1 Tang Xuefeng3 Meng Yike2 Li Guhai2 Zhu Lin2 Hu Shengde2

Unit： (1. Hubei Tri-ring forging Co. Ltd. Gucheng 441700 China 2. Faculty of Materials Wuhan University of Science and Technology Wuhan 430081 China 3. State Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan 430074 China)

KeyWords： Cr12MoV steel vacuum isothermal gas quenching hardness impact toughness microstructure evolution

ClassificationCode：TG162.4

year,vol(issue):pagenumber：2024,49(5):226-234

Abstract：

For the problem that Cr12MoV steel cannot have high hardness and impact toughness at the same time after conventional heat treatment, the research on the strength and toughness of Cr12MoV steel by vacuum heat treatment was carried out. Then, taking austenitization temperature, austenitization holding time, gas quenching pressure, low-temperature isothermal temperature and low- temperature isothermal time as five key process parameters, the vacuum gas quenching orthogonal experiment of Cr12MoV steel was designed, and taking Rockwell hardness and impact toughness as the strength and toughness evaluation indicators of the material, the influences of heat treatment process parameters on the properties of Cr12MoV material were analyzed by the range method. Furthermore, the microstructure of Cr12MoV steel after vacuum gas quenching was obtained by metallographic microscopy and scanning electron microscope, and the influences of heat treatment process parameters on the microstructure of Cr12MoV steel material were analyzed. The results show that the three process parameters of low-temperature isothermal temperature, austenitizing temperature and gas quenching pressure have the greatest impact on the hardness and impact toughness of Cr12MoV steel after vacuum heat treatment, and the austenitizing holding time has the least effect. Finally, the martensite/lower bainite duplex structure with good comprehensive properties is obtained.

Funds：

基金项目:材料成形与模具技术国家实验室开放基金(P2023-018)；湖北省技术创新重点研发项目（2023BAB030)；武汉科技大学分析测试中心实验资金

作者简介：汪拥进（1972-），男，学士，工程师 E-mail：shdzwyj@163.com

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