Accession Number : AD0769775
Title : Wear Particle Formation Mechanisms.
Descriptive Note : Annual rept. Sep 72-Sep 73,
Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE MATERIALS PROCESSING LAB
Personal Author(s) : Koba,Harry ; Cook,Nathan H. ; Joshi,Deep C.
Report Date : SEP 1973
Pagination or Media Count : 78
Abstract : The report describes the wear found in a lightly loaded, short duration, lubricated bronze on steel sliding system. Examination with a scanning electron microscope indicates that the surface of both bronze and steel are capable of very large plastic deformation. Evidence of a void formation/crack propagation mechanism, operating below the surface to produce loose wear particles was found. Wear particles precipitated out of the lubrication oil by a Ferrograph Analyzer and examined under high magnification showed considerable difference in size and shape to those which have been reported in the literature. Particle shape correlated well with a sub-surface void formation/crack propagation mechanism. A material transfer process of bronze to steel was found to be inconsistent with that predicted by the adhesion wear theory. Appendix one contains a progress report on the analysis of sliding contact of rough surface. (Modified author abstract)
Descriptors : (*Friction, *Metals), (*Wear, Metals), Sliding, Crack propagation, Surfaces, Bronze, Steel, Lubrication, Particles, Interfaces, Strain(Mechanics), Hardness, Abrasion, Polishes
Subject Categories : Metallurgy and Metallography
Lubricants and Hydraulic Fluids
Distribution Statement : APPROVED FOR PUBLIC RELEASE