真空气淬工艺对模具钢Cr12MoV组织和性能的影响  

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

作　　者：汪拥进 占克勤 裴薇 邵光保 唐学峰 蒙祎珂 李古海 朱琳 胡盛德[2] Wang Yongjin;Zhan Keqin;Pei Wei;Shao Guangbao;Tang Xuefeng;Meng Yike;Li Guhai;Zhu Lin;Hu Shengde(Hubei Tri-ring forging Co.,Ltd.,Gucheng 441700,China;Faculty of Materials,Wuhan University of Science and Technology,Wuhan 430081,China;State Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]湖北三环锻造有限公司,湖北谷城441700 [2]武汉科技大学材料学部,湖北武汉430081 [3]华中科技大学材料成形与模具技术国家实验室,湖北武汉430074

出　　处：《锻压技术》2024年第5期226-234,共9页Forging & Stamping Technology

基　　金：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。

摘　　要：针对Cr12MoV钢常规热处理后不能同时具备高硬度和冲击韧性的问题,开展了Cr12MoV钢的真空热处理强韧化研究。以奥氏体化温度、奥氏体化保温时间、气淬压力、低温等温温度以及低温等温时间5个关键工艺参数设计了Cr12MoV钢的真空气淬正交试验,以洛氏硬度和冲击韧性作为材料的强韧性评价指标,利用极差方法分析了热处理工艺参数对Cr12MoV钢材料性能的影响。利用金相显微镜、扫描电子显微镜对Cr12MoV钢真空气淬后的微观组织进行了观察,分析了热处理工艺参数对Cr12MoV钢材料微观组织的影响。结果表明:低温等温温度、奥氏体化温度和气淬压力3个工艺参数对Cr12MoV钢真空热处理后的硬度和冲击韧性影响最大,而奥氏体化保温时间影响最小,最终获得了综合性能较好的马氏体/下贝氏体复相组织。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.

关 键 词：CR12MOV钢 真空等温气淬 硬度 冲击韧性 组织演变 

分 类 号：TG162.4[金属学及工艺—热处理]