Effect of Hardness, Surface Finish and Grain Size on Rolling Contact Fatigue Life of M50 Bearing Steel

1958 ◽  
Author(s):  
R. A. Baughman
Keyword(s):  
Grain Size ◽  
Fatigue Life ◽  
Surface Finish ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Contact Fatigue Life

Effect of Hardness, Surface Finish, and Grain Size on Rolling-Contact Fatigue Life of M-50 Bearing Steel

1960 ◽  
Vol 82 (2) ◽  
pp. 287-294 ◽  
Author(s):  
R. A. Baughman
Keyword(s):  
Grain Size ◽  
Surface Finish ◽  
Rolling Contact Fatigue ◽  
Statistical Treatment ◽  
Contact Fatigue ◽  
Mathematical Expression ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Contact Fatigue Strength ◽  
Contact Fatigue Life

The effect of hardness, surface finish, and grain size upon the compressive rolling-contact fatigue strength of M-50 bearing steel has been studied. Considerable testing on the RC Rig and statistical-treatment methods have been included. A mathematical expression relating these variables to life expectancy is presented and the optimization of these variables is discussed. It is shown that bearing fatigue of M-50 increases by increasing hardness, decreasing surface, and increasing grain size. The optimum life identified occurs at Rc64 hardness, 1.5 rms surface finish, and a grain size of ASTM 2.

The Effect of Ausforming on the Rolling Contact Fatigue Life of a Typical Bearing Steel

1967 ◽  
Vol 89 (1) ◽  
pp. 63-72 ◽  
Author(s):  
E. N. Bamberger
Keyword(s):  
Fatigue Life ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Development Program ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Metallurgical Analysis ◽  
Contact Fatigue Life ◽  
Life Improvement ◽  
Carbide Particles

A development program has been conducted on M-50 to determine the improvements possible in bearing steels by the incorporation of a hot-cold working (ausforming) treatment in their processing. Primary emphasis was on the improvements possible in rolling contact fatigue. In support of this, heat-treat, corrosion, hardness, and microstructural studies have been performed. It has been shown that a certain process for working steel in the metastable austenitic condition as applied to the rolling contact fatigue life of M-50 bearing steel will substantially improve life, thereby increasing bearing reliability. The remarkable improvements in life (exceeding 800 percent) will be a significant factor in meeting the long-life-bearing requirements for advanced air-breathing propulsion systems. A metallurgical analysis has been conducted and a mechanism is proposed which is thought to be the primary factor in providing the significant improvements in rolling contact fatigue life. It is shown that these improvements in life are possible without any significant increase in hardness of the subject materials. Evidence is presented which indicates that the life improvement is primarily due to more uniform carbide dispersion, reduction of massive carbide particles, and reduction in martensite platelet size. These microstructural changes are believed to be associated with strain-induced precipitation and its interplay with strain-hardening during the deformation cycle.

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