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RESEARCH PAPERS

A Rolling Contact Fatigue Study of Hard Carbon Coated M-50 Steel

[+] Author and Article Information
R. Wei, P. J. Wilbur

Colorado State University, Fort Collins, CO 80523

F. M. Kustas

Martin Marietta Corp., Denver, CO 80201

J. Tribol 114(2), 298-302 (Apr 01, 1992) (5 pages) doi:10.1115/1.2920887 History: Received February 15, 1991; Revised May 01, 1991; Online June 05, 2008

Abstract

Hard carbon coatings with diamond-like properties were applied on AISI M-50 steel rods which were subjected to rolling contact fatigue (RCF) testing at a cyclic Hertzian stress level of 5.5 GPa. The coatings were produced using a single, broad beam ion source that directed 450 eV ions, derived from a methane discharge, onto the rods. Results from preliminary tests show that hard carbon coatings alter the fatigue failure characteristics of this material substantially. They caused the B50 lifetime to increase from 7.5 × 106 stress cycles for uncoated material to 13 × 106 but they also caused the B10 lifetime to decrease from 4 × 106 stress cycles for the uncoated material to less than 1 × 106 . The coatings induced an order of magnitude increase in lifetime for some tests. Scanning electron microscopy, surface profilometry and microhardness tests were used to examine coating morphologies, investigate coating/base material interfaces and demonstrate hardness increases.

Copyright © 1992 by The American Society of Mechanical Engineers
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