金属热处理 ›› 2023, Vol. 48 ›› Issue (5): 236-240.DOI: 10.13251/j.issn.0254-6051.2023.05.036

• 工艺研究 • 上一篇    下一篇

第二相析出强化真空渗碳淬火工艺

吕虎跃, 陈旭阳, 丛培武, 陆文林, 杜春辉, 胡凤娇   

  1. 中国机械总院集团北京机电研究所有限公司, 北京 100083
  • 收稿日期:2022-11-11 修回日期:2023-03-28 出版日期:2023-05-25 发布日期:2023-06-21
  • 通讯作者: 丛培武,研究员,E-mail: congpeiwu@126.com
  • 作者简介:吕虎跃(1998—),男,硕士研究生,主要研究方向为真空热处理工艺及设备,E-mail: huyue3256@163.com。
  • 基金资助:
    国家重点研发计划(2018YFB2001904)

Second phase precipitation strengthening process of vacuum carburizing and quenching

Lü Huyue, Chen Xuyang, Cong Peiwu, Lu Wenlin, Du Chunhui, Hu Fengjiao   

  1. Beijing Research Institute of Mechanical and Electrical Technology Co., Ltd. CAM, Beijing 100083, China
  • Received:2022-11-11 Revised:2023-03-28 Online:2023-05-25 Published:2023-06-21

摘要: 结合第二相析出强化原理并采用基于饱和值调整法的工艺路径,使用计算软件辅助制定第二相强化真空渗碳淬火工艺,并对18CrNiMo7-6钢制圆片试样和齿轮试样进行了试验。分别测试了圆片试样与齿轮的表面硬度、淬硬层深度,并观测了圆片和齿轮试样的显微组织。结果表明,第二相强化渗碳工艺可导致在渗碳层中析出大量弥散细小且分布均匀的碳化物,其作为渗碳层中的第二相粒子,提高圆片试样表面硬度至840 HV左右,且高硬度层较深,硬度-层深曲线较为理想,可以应用在齿轮等传动部件以提高其表面硬度。

关键词: 18CrNiMo7-6钢, 齿轮, 第二相析出强化, 渗碳淬火, 碳化物

Abstract: Combining the second phase precipitation strengthening principle and adopting the process path based on the saturation value adjustment method, the vacuum carburizing and quenching process was developed with the help of calculation software, and the second phase strengthening carburizing and quenching process test was carried out on 18CrNiMo7-6 steel disc specimens and gears. The surface hardness, depth of hardened layer and microstructure of the disc and gear specimens were measured. The results show that the second phase strengthening carburizing process can cause precipitation of a large amount of dispersed fine and evenly distributed carbides in the carburized layer, which improves the surface hardness of the disc specimen to about 840 HV by second phase strengthening, and makes the high hardness layer deeper and resulting more ideal hardness-layer depth curve. Such kind of second phase strengthening carburizing and quenching process can be successfully applied to gear and other transmission parts to improve the surface hardness.

Key words: 18CrNiMo7-6 steel, gear, second phase precipitation strengthening, carburizing and quenching, carbide

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