Nano- and Microhardness Distribution in the Carburized Case of Nb-Microalloyed Gear Steel

被引：5
|
作者：
Chen, W. [1 ,2 ]
He, X. F. [2 ]
Yu, W. C. [2 ]
Shi, J. [2 ]
Wang, M. Q. [2 ]
Yao, K. F. [1 ]
机构：
[1] Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China
[2] Cent Iron & Steel Res Inst, Inst Special Steel, Beijing 100081, Peoples R China
来源：
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2020年 / 29卷 / 07期
关键词：
carburized case; gear steel; nano-hardness; retained austenite; Vickers hardness; RETAINED AUSTENITE; STABILITY; TRANSFORMATION; MARTENSITE; BEHAVIOR;
D O I：
10.1007/s11665-020-04992-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The characteristics of in-depth hardness distribution in the high-temperature carburized case of Nb-microalloyed gear steel before and after cryogenic treatment were studied by nano-indentation method and Vickers hardness method. The results showed that there was no significant difference in Vickers hardness of the carburized case before and after cryogenic treatment, while the nano-hardness of the carburized case was increased after cryogenic treatment. The change of nano-hardness could be related to the decrease in retained austenite content. The retained austenite content in the surface of the carburized case was 26%, which was reduced to 18% after cryogenic treatment at - 196 degrees C, with the nano-hardness increased from 11.8 to 12.6 GPa. Nano-indentation can be used to reliably measure the properties of the high-temperature carburized case with fine retained austenite for Nb-microalloyed gear steel.
引用
收藏
页码：4626 / 4630
页数：5
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