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RESEARCH PAPERS

Effects of CO2 Laser Surface Hardening in the Unlubricated Wear of Ductile Cast Iron Against Alumina

[+] Author and Article Information
C. Papaphilippou, M. Vardavoulias, M. Jeandin

Ecole Des Mines De Paris, Centre des Matériaux, P.M. Fourt, B.P. 87, 91003 Evry Cedex, France

J. Tribol 118(4), 748-752 (Oct 01, 1996) (5 pages) doi:10.1115/1.2831603 History: Received January 31, 1995; Revised December 05, 1995; Online January 24, 2008

Abstract

The microstructure of a ferrito-pearlitic ductile cast iron has been modified by CO2 laser surface hardening. Analysis of the laser-processed surfaces showed a dramatic increase in microhardness. Dry sliding wear of laser-treated specimens against an alumina counterbody has been investigated by “ball-on-disk” testing. The evolution of the wear coefficient, as well as metallographic observations, revealed an oxidational wear mechanism. The wear resistance of the laser-treated samples was significantly enhanced. The laser-treated cast iron has a better resistance to abrasion and plastic deformation. The improvement of the wear resistance was due to the fine and homogeneous microstructure produced after laser-treatment. Wear plots showing the evolution of wear coefficient with normal load, sliding velocity, and humidity have been established. The wear of the laser-treated cast iron is not influenced by the variation of operating conditions (normal load, sliding velocity, and relative humidity).

Copyright © 1996 by The American Society of Mechanical Engineers
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