Fatigue Characteristics of Laser Surface-Hardened Cast Irons

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

Mechanical Engineering Department, Iowa State University, Ames, Iowa 50011

J. Eng. Mater. Technol 109(3), 179-187 (Jul 01, 1987) (9 pages) doi:10.1115/1.3225961 History: Received October 08, 1985; Online September 15, 2009


Contrary to expectations, laser surface heat treatment has a deleterious effect on the fatigue performance of pearlitic gray and ductile cast irons. A 1.2 kW, continuous wave, CO2 gas laser, operating in square beam mode, was employed to heat-treat the surfaces of standard fatigue specimens. Rotational-bending fatigue tests were then conducted on untreated (as-cast) and laser treated specimens. Results indicated that the effect on fatigue behavior of case depth, microstructure and hardness of laser-hardened surface layers were opposite to that observed in carbon and low alloy steels. A fracture model based on the presence of graphite, residual stresses, and strain-induced transformation is postulated to explain the adverse effect of laser hardening of cast irons.

Copyright © 1987 by ASME
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