Accession Number : AD0884448

Title :   Structural Studies of Bearing Steel Undergoing Cyclic Stressing.

Descriptive Note : Final summary rept.,

Corporate Author : SKF INDUSTRIES INC KING OF PRUSSIA PA RESEARCH LAB

Personal Author(s) : Leonard, L. ; Cocks, M. ; McCool, J. I.

Report Date : APR 1971

Pagination or Media Count : 128

Abstract : A report is made on a metallurgical investigation of the failure mechanisms which operate in bearing steels during cyclic stressing. It describes the findings and conclusions reached under this investigation regarding the microstructural changes which accompany fatigue and the nature of fatigu crack initiation and propagation mechanisms. It describes findings from observations of bearing surfaces by electron and light microscopy techniques and relates microstructural and morphological changes with lubrication phenomena. Experimental studies of run-in of rolling bearing steel surfaces are described, in which EHD film changes and surface morphology are monitored. Optical film shape measurements showing the effect of surface defects on EHD film are presented and interpreted. Statistical data on the relative density of non-metallic inclusions in different bearing grade steels is presented and correlated with endurance life. (Author)

Descriptors :   (*BEARINGS, STRUCTURAL PROPERTIES), (*STEEL, STRESSES), FAILURE(MECHANICS), FATIGUE(MECHANICS), SURFACE PROPERTIES, DEFECTS(MATERIALS), LUBRICATION, MICROSTRUCTURE.

Subject Categories : Properties of Metals and Alloys
      Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE