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

被引:33
作者
Wei, Shaopeng [1 ]
Wang, Gang [1 ]
Zhao, Xianhui [1 ]
Zhang, Xiaopeng [1 ]
Rong, Yiming [1 ,2 ]
机构
[1] Tsinghua Univ, Beijing Key Lab Precis Ultra Precis Mfg Equipment, Beijing 100084, Peoples R China
[2] Worcester Polytech Inst, Dept Mech Engn, Worcester, MA 01609 USA
关键词
low-carbon alloy steel; microstructure; process design; vacuum carburizing; PLASMA;
D O I
10.1007/s11665-013-0762-1
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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.
引用
收藏
页码:545 / 550
页数:6
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