AN ELECTRON FRACTOGRAPHIC STUDY OF SPALLS FORMED DURING ROLLING CONTACT.

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)

Document Details

Document Type
Technical Report
Publication Date
Jun 06, 1967
Accession Number
AD0816393

Entities

People

  • Salvatore F. Borgese
  • William J. Pantalone

Tags

DTIC Thesaurus Topics

  • Charged Particles
  • Electrons
  • Elementary Fermions
  • Elementary Particles
  • Fermions
  • Finishes
  • Grooving
  • Leptons
  • Striations

Readers

  • Materials Science (Mechanical Engineering).
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).

Technology Areas

  • Microelectronics