金属热处理 ›› 2022, Vol. 47 ›› Issue (10): 139-146.DOI: 10.13251/j.issn.0254-6051.2022.10.023

• 工艺研究 • 上一篇    下一篇

淬火温度对40Si2Ni2CrMoV钢组织及析出行为的影响

张伟锋1,2, 何肖飞2, 尉文超2, 李莉1, 王毛球2   

  1. 1.昆明理工大学 材料科学与工程学院, 云南 昆明 654199;
    2.钢铁研究总院有限公司 特殊钢研究院, 北京 100081
  • 收稿日期:2022-05-16 修回日期:2022-08-15 出版日期:2022-10-25 发布日期:2022-12-15
  • 通讯作者: 李 莉,副教授,博士,E-mail: kmustlili@163.com
  • 作者简介:张伟锋(1996—),男,硕士研究生,主要研究方向为弹簧钢的微合金化,E-mail:waifongzeong@163.com。

Effect of quenching temperature on microstructure and precipitation behavior of 40Si2Ni2CrMoV steel

Zhang Weifeng1,2, He Xiaofei2, Yu Wenchao2, Li Li1, Wang Maoqiu2   

  1. 1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 654199, China;
    2. Research Institute of Special Steels, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China
  • Received:2022-05-16 Revised:2022-08-15 Online:2022-10-25 Published:2022-12-15

摘要: 通过OM、SEM、TEM等手段,研究了40Si2Ni2CrMoV钢不同温度淬火(840、860、880、900 ℃)和300 ℃回火后的显微组织和力学性能,并利用相分析法对钢中的析出相进行了定性及定量表征。结果表明,在800~900 ℃淬火时,随着淬火温度的升高,试验钢的组织为板条马氏体,并呈现先细化后粗化的趋势,在880 ℃时组织最细,且均匀性较好;析出相弥散分布于马氏体基体中,随着淬火温度的升高,析出相逐渐回溶。结合力学性能研究,认为880 ℃是该试验钢较合适的淬火温度。

关键词: 淬火温度, 40Si2Ni2CrMoV钢, 微观组织, 析出相

Abstract: Microstructure and mechanical properties of 40Si2Ni2CrMoV steel quenched at different temperatures (840, 860, 880, 900 ℃) and tempered at 300 ℃were studied by means of OM, SEM and TEM, and the precipitates in the steel were qualitatively and quantitatively characterized by phase analysis method. The results show that when quenched at 800-900 ℃, the microstructure of the tested steel is lath martensite and shows a trend of first refining and then coarsening with the increase of quenching temperature. When the quenching temperature is 880 ℃, the steel has the finest and most uniform microstructure, and the precipitates are dispersed in the martensite matrix. As the quenching temperature increases, the precipitates gradually dissolve into the matrix. Combining with the mechanical properties, it is considered that 880 ℃ is a suitable quenching temperature for the tested steel.

Key words: quenching temperature, 40Si2Ni2CrMoV steel, microstructure, precipitate

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