Accession Number : AD0816393

Title :   AN ELECTRON FRACTOGRAPHIC STUDY OF SPALLS FORMED DURING ROLLING CONTACT.

Descriptive Note : Special rept. 1 May 66-30 Apr 67,

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

Personal Author(s) : Borgese, Salvatore F. ; Pantalone, William J.

Report Date : 06 JUN 1967

Pagination or Media Count : 24

Abstract : A technique is described for making fractographs of fatigue spalls formed in bearings during rolling contact. Results are given which illustrate the usefulness of the method in identifying the fracture modes encountered in spalls. All of the fractures observed were transgranular with no evidence of any intergranular fractures. Regions of fatigue striations, cleavage, dimpled rupture and quasi-cleavage were identified in each spall examined. In a spall which initiated at a surface defect (grinding furrow), the region at the initiation point failed by forming fatigue striations. Fractographic analysis showed that the final stages of fracture were by cleavage and quasi-cleavage. (Author)

Descriptors :   (*BALL BEARINGS, FRACTOGRAPHY), ELECTRON MICROSCOPY, SPALLATION, MICROSTRUCTURE, FRACTURE(MECHANICS), FATIGUE(MECHANICS), ANTIFRICTION BEARINGS, TEST METHODS, RUPTURE, SHEAR STRESSES, LOADS(FORCES), CRACK PROPAGATION, BRITTLENESS, BEARINGS, STEEL.

Subject Categories : Properties of Metals and Alloys
      Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE