Experimental study on vacuum carburizing process for low-carbon alloy steel

Shaopeng Wei, Gang Wang, Xianhui Zhao, Xiaopeng Zhang, Yiming Rong

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)545-550
Number of pages6
JournalJournal of Materials Engineering and Performance
Volume23
Issue number2
DOIs
StatePublished - Feb 2014
Externally publishedYes

Keywords

  • low-carbon alloy steel
  • microstructure
  • process design
  • vacuum carburizing

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