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

[+] Author and Article Information
R. A. Baughman

Materials Applications Unit, General Electric Company, Flight Propulsion Laboratory Department, Cincinnati, Ohio

J. Basic Eng 82(2), 287-294 (Jun 01, 1960) (8 pages) doi:10.1115/1.3662574 History: Received August 18, 1959; Online November 04, 2011


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 Rc 64 hardness, 1.5 rms surface finish, and a grain size of ASTM 2.

Copyright © 1960 by ASME
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