金属热处理 ›› 2023, Vol. 48 ›› Issue (4): 161-165.DOI: 10.13251/j.issn.0254-6051.2023.04.026

• 工艺研究 • 上一篇    下一篇

42CrMoVNb钢的热处理工艺优化及力学性能

韩贵生1, 张学敏1, 李海涛1, 樊帅奇1, 戴姣燕2, 徐金富1,2   

  1. 1.长安大学 材料科学与工程学院, 陕西 西安 710061;
    2.宁波工程学院 材料与化学工程学院, 浙江 宁波 315211
  • 收稿日期:2022-10-20 修回日期:2023-01-08 发布日期:2023-05-27
  • 通讯作者: 徐金富,教授,博士,E-mail: xjf7413@sina.com
  • 作者简介:韩贵生(1996—),男,硕士研究生,主要研究方向为热处理工艺,E-mail: 1329002074@qq.com。

Heat treatment process optimization and mechanical properties of 42CrMoVNb steel

Han Guisheng1, Zhang Xueming1, Li Haitao1, Fan Shuaiqi1, Dai Jiaoyan2, Xu Jinfu1,2   

  1. 1. School of Materials Science and Engineering, Chang'an University, Xi'an Shaanxi 710061, China;
    2. School of Materials Science and Chemical Engineering, Ningbo University of Technology, Ningbo Zhejiang 315211, China
  • Received:2022-10-20 Revised:2023-01-08 Published:2023-05-27

摘要: 利用单因素和正交试验对42CrMoVNb钢的热处理工艺进行了优化,利用洛氏硬度计、万能拉伸试验机和金属摆锤冲击试验机检测了相关的力学性能,研究了热处理工艺对42CrMoVNb钢组织和力学性能的影响。结果表明,42CrMoVNb钢的最优淬火回火工艺为 860 ℃×20 min,油冷+440 ℃×150 min,空冷;经最优工艺处理后其组织为回火屈氏体基体上弥散分布着细小的碳化物颗粒,硬度、抗拉强度、屈服强度、屈强比、断后伸长率、断面收缩率和-20 ℃低温冲击吸收能量分别为44.5 HRC 、1467 MPa、1357 MPa、0.93、10.5%、46%和27.1 J;力学性能满足14.9级高强度螺栓的技术指标要求。

关键词: 热处理, 42CrMoVNb钢, 抗拉强度, 屈服强度, 冲击性能

Abstract: Heat treatment process of 42CrMoVNb steel was optimized by single factor and orthogonal tests. The mechanical properties of the 42CrMoVNb steel were tested by Rockwell hardness tester, universal tensile testing machine and metal pendulum impact testing machine. The effect of heat treatment process on microstructure and mechanical properties of the 42CrMoVNb steel was studied. The results show that the optimal heat treatment process of the 42CrMoVNb steel is quenching at 860 ℃ for 20 min, oil cooling and tempering at 440 ℃ for 150 min, air cooling. The microstructure under the optimal heat treatment process is tempered troostite matrix dispersed with fine carbide particles, the hardness, tensile strength, yield strength, yield ratio, elongation after fracture, percentage reduction of area and impact absorbed energy at -20 ℃ are 44.5 HRC, 1467 MPa, 1357 MPa, 0.93, 10.5%, 46% and 27.1 J, respectively, which all meet the mechanical properties requirements of 14.9 grade high strength bolts.

Key words: heat treatment, 42CrMoVNb steel, tensile strength, yield strength, impact property

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