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RESEARCH PAPERS

Microstructural Alterations of Rolling—Bearing Steel Undergoing Cyclic Stressing

[+] Author and Article Information
J. A. Martin, S. F. Borgese, A. D. Eberhardt

Research Laboratory, S K F Industries, Inc., Engineering and Research Center, King of Prussia, Pa.

J. Basic Eng 88(3), 555-565 (Sep 01, 1966) (11 pages) doi:10.1115/1.3645902 History: Received August 13, 1965; Online September 19, 2011

Abstract

After prolonged cyclic stressing in rolling contact, AISI 52100 bearing steel parts develop extensive regions of microstructural alteration, designated as white etching areas. These are oriented in predictable directions relative to the rolling track. Lenticular carbides are always associated with these areas. Evidence is presented indicating that the boundaries of lenticular carbides constitute planes of weakness which may be preferred planes of fatigue cracking. In the transmission electron microscope the martensitic structure appears gradually transformed into a cell like structure by the action of cyclic stress. The size of crystallites is greatly reduced in this process. The density of microstructural change is found increased with cycling and is distributed in depth along a curve resembling that of the calculated maximum unidirectional shear stress with little or no visible change in the region of maximum orthogonal (alternating) shear stress.

Copyright © 1966 by ASME
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