Experimental Study on Vacuum Carburizing Process for Low-Carbon Alloy Steel

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• 作者：Shaopeng Wei (1)
  Gang Wang (1)
  Xianhui Zhao (1)
  Xiaopeng Zhang (1)
  Yiming Rong (1) (2)
  
• 关键词：low ; carbon alloy steel ; microstructure ; process design ; vacuum carburizing
• 刊名：Journal of Materials Engineering and Performance
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：23
• 期：2
• 页码：545-550
• 全文大小：602 KB
• 作者单位：Shaopeng Wei (1)
  Gang Wang (1)
  Xianhui Zhao (1)
  Xiaopeng Zhang (1)
  Yiming Rong (1) (2)
  
  1. Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control, Tsinghua University, Beijing, 100084, China
  2. Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, MA, 01609, USA
  
• ISSN：1544-1024

文摘

As a low-carbon alloy steel, 20Cr2Ni4A steel has an excellent mechanical properties. It has been used for producing heavy-duty gears, which require good wear and fatigue resistance. The vacuum carburizing process can improve the quality of gears and extend the service life. In this article, a complete heat-treatment process for 20Cr2Ni4A, with carburizing, tempering, quenching and cryogenic steps involved, was proposed. A numerical method was employed to design the carburizing step. The carburized samples were characterized by analysis of carbon profile, surface-retained austenite content, microstructure, and hardness profile. A good microstructure was obtained with acicular-tempered martensite, less-retained austenite, fine granular-dispersed carbides, and was oxide free. The final surface hardness was 64.2HRC, and the case depth was 0.86?mm, which meet the requirements of products. The relationships among process, performance, and microstructure were investigated to understand the inner connection.