Cleanliness of Bearing Steels and Fatigue Life of Rolling Contacts

2006 ◽  
Vol 3 (6) ◽  
pp. 14040 ◽  
Author(s):  
A Kerrigan ◽  
JC Kuijpers ◽  
A Gabelli ◽  
E Ioannides ◽  
SW Dean
Keyword(s):  
Fatigue Life ◽  
Bearing Steels ◽  
Rolling Contacts

scholarly journals Quantitative Analysis of Inclusion Engineering on the Fatigue Property Improvement of Bearing Steel

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 476 ◽  
Author(s):  
Chao Gu ◽  
Min Wang ◽  
Yanping Bao ◽  
Fuming Wang ◽  
Junhe Lian
Keyword(s):  
Fatigue Life ◽  
Quantitative Analysis ◽  
Critical Size ◽  
Fatigue Behavior ◽  
Fatigue Cracks ◽  
Fatigue Property ◽  
Bearing Steel ◽  
Fatigue Properties ◽  
Bearing Steels ◽  
Inclusion Distribution

The fatigue property is significantly affected by the inner inclusions in steel. Due to the inhomogeneity of inclusion distribution in the micro-scale, it is not straightforward to quantify the effect of inclusions on fatigue behavior. Various investigations have been performed to correlate the inclusion characteristics, such as inclusion fraction, size, and composition, with fatigue life. However, these studies are generally based on vast types of steels and even for a similar steel grade, the alloy concept and microstructure information can still be of non-negligible difference. For a quantitative analysis of the fatigue life improvement with respect to the inclusion engineering, a systematic and carefully designed study is still needed to explore the engineering dimensions of inclusions. Therefore, in this study, three types of bearing steels with inclusions of the same types, but different sizes and amounts, were produced with 50 kg hot state experiments. The following forging and heat treatment procedures were kept consistent to ensure that the only controlled variable is inclusion. The fatigue properties were compared and the inclusions that triggered the fatigue cracks were analyzed to deduce the critical sizes of inclusions in terms of fatigue failure. The results show that the critical sizes of different inclusion types vary in bearing steels. The critical size of the spinel is 8.5 μm and the critical size of the calcium aluminate is 13.5 μm under the fatigue stress of 1200 MPa. In addition, with the increase of the cleanliness of bearing steels, the improvement of fatigue properties will reach saturation. Under this condition, further increasing of the cleanliness of the bearing steel will not contribute to the improvement of fatigue property for the investigated alloy and process design.

scholarly journals Effects of Retained Austenite on the Rolling Fatigue Life of Ball Bearing Steels

1974 ◽  
Vol 15 (3) ◽  
pp. 173-179 ◽  
Author(s):  
Etsujiro Yajima ◽  
Tôru Miyazaki ◽  
Toshihiko Sugiyama ◽  
Hiroo Terajima
Keyword(s):  
Fatigue Life ◽  
Retained Austenite ◽  
Ball Bearing ◽  
Bearing Steels

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.

Study on the Influence of Inclusion and Void on Fatigue Life of Bearing Steel Using Statistics of Extreme Values

2011 ◽  
Vol 284-286 ◽  
pp. 1258-1261 ◽  
Author(s):  
Chin Chuan Hsu ◽  
Ho Hua Chung
Keyword(s):  
Fatigue Life ◽  
Nonmetallic Inclusion ◽  
Extreme Values ◽  
Energy Dispersive Spectrometer ◽  
Inclusion Size ◽  
Bearing Steel ◽  
Propagation Path ◽  
Void Size ◽  
Inclusion Type ◽  
Bearing Steels

The maximum nonmetallic inclusion size and void of bearing steel has been analyzed using statistics of extreme values (SEV) in this study, and the influence of the maximum nonmetallic inclusion and void size on fatigue life of bearing steel has been discussed as well. Scanning electron microscopy (SEM) was used to measure the inclusion and void size, and the identification of inclusion type has been carried out by energy dispersive spectrometer (EDS). The results show that there are small hard round oxides or sharp TiN inside or beside the soft MnS strip in steels, single MnS strips and small clustered Al2O3 are also present. Most of voids in steels are branched rod-like or feathery, and the size of void is much smaller than inclusion for all steels. Therefore, the void is not the fatigue orgin for bearing steels. By adopting the criterion of return period (T) at 200, a serial analysis shows that the relation between inclusion/void size and fatigue life for steels is inverse proportion except B steel. This results from that larger inclusion could not only initialize crack, but also increase the propagation path of crack and accelerate fracture.

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