金属学报英文版 ›› 2015, Vol. 28 ›› Issue (6): 787-792.DOI: 10.1007/s40195-015-0264-2

• • 上一篇    下一篇

  

  • 收稿日期:2014-12-23 修回日期:2015-02-07 出版日期:2015-03-21 发布日期:2015-07-23

Effects of Sub-zero Celsius Treatment and Tempering on the Stability of Retained Austenite in Bearing Steel

Xiao-Hui Lu1,2, Wei Li2(), Cheng-Lin Wang2, Hong-Shan Zhao2, Xue-Jun Jin1()   

  1. (1)State Key Lab of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
    (2)Institute of Advanced Steels and Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
  • Received:2014-12-23 Revised:2015-02-07 Online:2015-03-21 Published:2015-07-23

RichHTML

2

PDF (PC)

978

Abstract:

In this work, the influence of sub-zero Celsius treatment and tempering on the mechanical and thermal stability of retained austenite in bearing steel were assessed by tensile test and DSC. Compared with traditional quenched and tempered treatment, sub-zero Celsius treatment obviously decreases the volume fraction of retained austenite. Moreover, the mechanical stability of retained austenite was enhanced due to the accumulation of compressive stresses in retained austenite after sub-zero Celsius treatment and tempering. Meanwhile, the morphology of retained austenite changed from film-like to blocky with austenitization temperature increasing, and the mechanical stability of film-like retained austenite is higher than that of blocky one. The DSC results showed that the activation energy of retained austenite decomposition slightly increased through sub-zero Celsius treatment and tempering. This result may probably be ascribed to partitioning of carbon during tempering. However, the temperature at which retained austenite starts to decompose is unchanged.

Key words: Bearing, steel, Sub-zero, Celsius, treatment, Retained, austenite, Stability