金属热处理 ›› 2022, Vol. 47 ›› Issue (8): 211-216.DOI: 10.13251/j.issn.0254-6051.2022.08.035

• 工艺研究 • 上一篇    下一篇

淬火温度对5Cr15MoV钢空冷淬火组织与性能的影响

田春英1, 董纪1, 王军2, 张慧星1, 冯天建3, 刘晓凡1   

  1. 1.天津中德应用技术大学 机械工程学院, 天津 300350;
    2.天津中德应用技术大学 航空航天学院, 天津 300350;
    3.天津市信泰科技发展有限公司, 天津 300383
  • 收稿日期:2022-04-28 修回日期:2022-07-05 出版日期:2022-08-25 发布日期:2022-09-19
  • 作者简介:田春英(1974—),女,高级实验师,硕士,主要研究方向为金属材料成形与热处理,E-mail:tiancywjwkx@163.com。
  • 基金资助:
    天津市企业科技特派员项目(20YDTPJC01130)

Effect of quenching temperature on microstructure and properties of 5Cr15MoV steel by air-cooling quenching

Tian Chunying1, Dong Ji1, Wang Jun2, Zhang Huixing1, Feng Tianjian3, Liu Xiaofan1   

  1. 1. School of Mechanical Engineering, Tianjin Sino-German University of Applied Sciences, Tianjin 300350, China;
    2. School of Aeronautics and Astronautics, Tianjin Sino-German University of Applied Sciences, Tianjin 300350, China;
    3. Tianjin Xintai Technology Development Co., Ltd., Tianjin 300383, China
  • Received:2022-04-28 Revised:2022-07-05 Online:2022-08-25 Published:2022-09-19

摘要: 通过1000~1200 ℃间隔50 ℃的系列加热温度对5Cr15MoV马氏体不锈钢进行空冷淬火试验,并采用光学显微镜、EBSD和洛氏硬度计对不同温度淬火后组织和硬度进行检测,研究了淬火温度对试验钢组织、晶粒尺寸、残留奥氏体含量以及硬度的影响。结果表明,试验钢淬火后组织为马氏体+未溶合金碳化物+残留奥氏体。随着淬火温度升高,马氏体板条尺寸增大,未溶碳化物量逐渐减少直至消失,残留奥氏体含量先增加后减少。试验钢的硬度变化趋势为先增加后显著降低,在淬火温度为1050 ℃达到最大值60.8 HRC。试验钢硬度主要是马氏体的含碳量、晶粒尺寸、残留奥氏体含量和碳化物含量综合作用的结果。

关键词: 5Cr15MoV钢, 空冷淬火, 淬火温度, 组织, 硬度

Abstract: Air cooling quenching experiment was performed on 5Cr15MoV martensitic stainless steel at a series of heating temperatures ranging from 1000 ℃ to 1200 ℃ at an interval of 50 ℃. The test of microstructure and hardness were performed by means of optical microscope, EBSD and Rockwell hardness tester after quenching at different temperatures. The effect of quenching temperature on microstructure, grain size, retained austenite content and hardness of the tested steel was studied. The results show that the quenched steel consists of martensite, undissolved carbide and retained austenite. With the increase of quenching temperature, the size of martensitic lath increases, the amount of undissolved carbide decreases gradually until it disappears, and the content of retained austenite increases first and then decreases. The hardness of the tested steel increases first and then decreases significantly, and reaches the maximum of 60.8 HRC at 1050 ℃. The hardness of the tested steel is mainly the result of comprehensive effect of carbon content of martensite, grain size, retained austenite content and carbide content.

Key words: 5Cr15MoV steel, air-cooling quenching, quenching temperature, microstructure, hardness

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