Effect of Nonmetallic Inclusions on Rolling-Contact Fatigue Life in Bearing Steels

2009 ◽  
pp. 138-138-12 ◽  
Author(s):  
M Kinoshi ◽  
A Koyanagi
Keyword(s):  
Fatigue Life ◽  
Nonmetallic Inclusions ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Bearing Steels ◽  
Contact Fatigue Life

scholarly journals Factors That Affect Rolling Contact Fatigue Life of Ceramics and Rolling Contact Fatigue Life of Ceramic Balls and Rollers

1990 ◽  
Author(s):  
Y. Nishihara ◽  
H. Nakashima ◽  
N. Tsushima ◽  
S. Ito
Keyword(s):  
Fatigue Life ◽  
Manufacturing Process ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Process Variables ◽  
Rolling Bearings ◽  
Bearing Steels ◽  
Contact Fatigue Life

The rolling contact fatigue life of ceramics for rolling bearings has improved remarkably in recent years, and is now superior to that of bearing steels. This paper describes experiments to investigate the influence of manufacturing process variables on rolling contact fatigue life and compares the rolling contact fatigue life of current improved ceramics with bearing steels.

Improvement of Rolling Contact Fatigue Life of Bearing Steel by Quenching and Partitioning Process

2012 ◽  
Vol 706-709 ◽  
pp. 2152-2157 ◽  
Author(s):  
Kwan Ho Kim ◽  
Jae Seung Lee ◽  
Duk Lak Lee
Keyword(s):  
Fatigue Life ◽  
Silicon Content ◽  
Retained Austenite ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Quenching And Partitioning ◽  
Bearing Steels ◽  
Contact Fatigue Life

Over the decades, the rolling contact fatigue life of bearing steels has been enhanced mainly by the decrease in total oxygen content in the steels which was accomplished by improving steelmaking processes or facilities. However, it has almost been kept constant in the level of 5 ppm since 1990s and, therefore, it is necessary to find out other methods to enhance the RCFL. It is a well-known fact that the RCFL of bearing steels is maximized with the adequate amount of retained austenite and increasing silicon content results in the increase of the resistance to softening during tempering. In the present study, in order to take advantage of the effects of retained austenite and increasing silicon content, a new through-hardening heat treatment, quenching and partitioning (Q&P), has been chosen in place of the conventional quenching and tempering. One of the distinct differences between tempering and partitioning is no fine carbide precipitation during partitioning, leading to the stabilization of retained austenite due to the diffusion of carbon atoms from martensite, which can be realized by increasing silicon content. On the other hand, the increase of silicon content retarded the spheroidization behavior of cementites, requiring higher annealing temperature to assure the complete spheroidization. A new high carbon chromium bearing steel through-hardened by Q&P process showed superior RCFL characteristics to the conventional steel and process.

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