金属热处理 ›› 2020, Vol. 45 ›› Issue (8): 105-107.DOI: 10.13251/j.issn.0254-6051.2020.08.020

• 工艺研究 • 上一篇    下一篇

“零保温”淬火工艺对40Cr钢组织与性能的影响

康学勤1,2,3, 许正茂1, 林恩波2, 陈亮3   

  1. 1.徐州万达回转支承有限公司, 江苏 徐州 221000;
    2.徐州神威基业机械科技有限公司, 江苏 徐州 221000;
    3.中国矿业大学 材料科学与工程学院, 江苏 徐州 221116
  • 收稿日期:2020-01-30 出版日期:2020-08-25 发布日期:2020-09-07
  • 作者简介:康学勤(1978—),男,博士研究生,主要研究方向为材料失效分析、金属材料热处理工艺和摩擦学,E-mail:cumtkxq@cumt.edu.cn
  • 基金资助:
    徐州市政策引导类计划(科技合作)(KC18249)

Effect of quenching without holding on microstructure and mechanical properties of 40Cr steel

Kang Xueqin1,2,3, Xu Zhengmao1, Lin Enbo2, Chen Liang3   

  1. 1. Xuzhou Wanda Slewing Bearing Company Limited, Xuzhou Jiangsu 221000, China;
    2. Xuzhou Shenwei Jiye Machinery Technology Company Limited, Xuzhou Jiangsu 221000, China;
    3. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou Jiangsu 221116, China
  • Received:2020-01-30 Online:2020-08-25 Published:2020-09-07

摘要: 研究了不同温度“零保温”淬火工艺下,40Cr钢的显微组织与性能的变化规律。结果表明,在850~910 ℃下“零保温”淬火和550 ℃回火后,40Cr钢的硬度、抗拉强度和冲击吸收能量随温度的升高先增加后降低。890 ℃“零保温”淬火和550 ℃回火时,钢的硬度、抗拉强度和冲击吸收能量达到最高值,这些性能均优于同温度下保温淬火时试验钢的性能。40Cr钢“零保温”淬火性能的提高与其淬火后得到的细小板条状马氏体组织、奥氏体晶粒的细化和奥氏体中碳浓度分布不均匀有关。

关键词: 40Cr钢, “零保温”淬火, 显微组织, 性能

Abstract: Microstructure and properties of the 40Cr steel quenched at different temperatures without holding were studied. The results show that when quenched in the range of 850-910 ℃ without holding and tempered at 550 ℃, the hardness, tensile strength and impact absorbed energy of the 40Cr steel increase first and then decrease with the increase of quenching temperature. The highest hardness, tensile strength and impact absorbed energy can be obtained when quenched at 890 ℃ without holding and tempered at 550 ℃, and these properties are better than that by traditional quenching with holding. The property improvement of the 40Cr steel after quenching without holding is related to its fine lath martensite, austenite grain refinement and non-uniform distribution of carbon concentration in austenite.

Key words: 40Cr steel, quenching without holding, microstructure, properties

中图分类号: