金属热处理 ›› 2022, Vol. 47 ›› Issue (7): 125-128.DOI: 10.13251/j.issn.0254-6051.2022.07.022

• 工艺研究 • 上一篇    下一篇

热处理对含Mo轴承钢组织和性能的影响

许荣昌1, 王毅1, 孙宗辉1, 李辉2   

  1. 1.山东钢铁股份有限公司 山钢研究院, 山东 济南 271100;
    2.山东理工大学 材料科学与工程学院, 山东 淄博 255000
  • 收稿日期:2022-04-14 修回日期:2022-05-30 出版日期:2022-07-25 发布日期:2022-08-12
  • 通讯作者: 李 辉,副教授,博士,E-mail:lhlwj8888@163.com
  • 作者简介:许荣昌(1971—),男,正高级工程师,博士,主要研究方向为轴承钢的产品开发,E-mail:18663489258@163.com。
  • 基金资助:
    山东省重大科技创新项目(2018YFJH0101)

Influence of heat treatment on microstructure and properties of Mo-containing bearing steel

Xu Rongchang1, Wang Yi1, Sun Zonghui1, Li Hui2   

  1. 1. Research Institute, Shandong Iron & Steel Co., Ltd., Jinan Shandong 271100, China;
    2. School of Materials Science and Engineering, Shandong University of Technology, Zibo Shandong 255000, China
  • Received:2022-04-14 Revised:2022-05-30 Online:2022-07-25 Published:2022-08-12

摘要: 研究了含Mo轴承钢的相变规律及热处理制度对其组织和性能的影响,运用SEM和XRD表征了其显微组织,绘制了动态CCT曲线,测试了其硬度、力学性能和耐磨损性能。结果表明,由于钢中含有Mo,推迟了珠光体组织转变,当冷速≥4 ℃/s时冷却过程只发生马氏体相变;淬火+低温回火后,钢的抗拉强度和维氏硬度分别为1850 MPa和785 HV;而经贝氏体等温淬火后钢的抗拉强度和硬度分别达到2160 MPa和735 HV。淬火+低温回火后残留奥氏体的体积分数约为12.68%,而贝氏体等温淬火后约为3.88%。残留奥氏体含量的降低,有助于提高轴承钢的尺寸稳定性。

关键词: 含Mo轴承钢, 微观组织, 性能, 碳化物

Abstract: Phase change law and influence of heat treatment on microstructure and properties of Mo-containing bearing steel were investigated. The microstructure was characterized by using SEM and XRD, the CCT curves were drawn, the micro-hardness, mechanical properties and wear resistance were tested. The results indicate that Mo contained in the tested steel postpones the transformation of pearlite, and only martensite transformation occurs while the cooling rate is higher than 4 ℃/s. When quenched and low-temperature tempered, the tensile strength and micro-hardness is 1850 MPa and 785 HV, respectively, while 2160 MPa and 735 HV when austempered. The volume fraction of retained austenite is 12.68% when quenched and low-temperature tempered, while 3.88% when austempered. The reduction of the retained austenite content contributes to the dimensional stability of the bearing steel.

Key words: Mo-containing bearing steel, microstructure, properties, carbide

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