Accession Number : AD0861999

Title :   Surface and Subsurface Observations of Endurance Tested 6309 Size Bearings.

Descriptive Note : Special rept.,

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

Personal Author(s) : Leonard, Lawrence ; Martin, John A. ; Choman, Lawrence J.

Report Date : 06 OCT 1969

Pagination or Media Count : 65

Abstract : A metallurgical investigation of the failure mechanisms which operate in bearing steels during cyclic stressing in rolling contact has been in progress since March 1964. This report covers observations made periodically during endurance testing on the inner ring surfaces of 6309 size ball bearings. Particular attention was paid to characteristic surface defects (i.e. dents and pits) which formed during running and their influence on initiation and propagation of spalling type failures. Subsurface observations were made (at the end of selected test runs) in the vicinity of these defects in an effort to determine what structural changes occur and how these changes affect the failure mechanism. (Author)

Descriptors :   (*BALL BEARINGS, SURFACE PROPERTIES), DEFECTS(MATERIALS), CRACKS, CRACK PROPAGATION, DEFORMATION, MICROSTRUCTURE, FAILURE(MECHANICS), STRUCTURAL PROPERTIES.

Subject Categories : Machinery and Tools
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE