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RESEARCH PAPERS

Wear Behavior of Laser Surface-Hardened Gray and Ductile Cast Irons. Part 2—Erosive Wear

[+] Author and Article Information
P. A. Molian

Department of Mechanical Engineering, Engineering Research Institute, Iowa State University, Ames, Iowa 50011

Mark Baldwin

Iowa Laser Technology, Inc., Cedar Falls, Iowa

J. Tribol 110(3), 462-466 (Jul 01, 1988) (5 pages) doi:10.1115/1.3261651 History: Received January 11, 1988; Online October 29, 2009

Abstract

A 1.2-kW, continuous wave, CO2 -gas laser was used to transformation harden or melt the surface of gray and ductile cast irons. Effects of surface-hardened layers on solid particle erosion showed that the erosion rate decreased with an increase in surface hardness and case depth. The order of matrix microstructures that increased the erosion rate were ledeburite, tempered martensite, and pearlite. These results were opposite to those observed in bulk-hardened alloys. Erosion mechanisms of brittle, gray iron included micromachining in the untreated condition and grain boundary cracking in the laser-treated condition. In contrast, erosion modes of ductile iron were plastic flow followed by cracking in the untreated condition and platelet formation and fatigue in the laser-treated conditions. The beneficial effects of surface hardening on erosion were examined and discussed.

Copyright © 1988 by ASME
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