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Proceedings Paper

Experimental Determination Of The Coupling Coefficient In Laser Surface Hardening Of Steel
Author(s): John R Bradley
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Paper Abstract

Steel and cast iron surfaces that are to be laser transformation hardened must first be coated with an absorptive layer to enhance coupling of the CO2 laser beam with the workpiece. A series of laser surface heating experiments was performed on plain carbon steel plates which had been coated with an absorptive copper selenide layer. A 1.5 kw cw CO2 laser was used to scan the steel surfaces with a Gaussian beam of constant power and spot size. An analytic solution to the heat transfer equation was used to calculate the hardened depths for comparison with measured values. A comparison of calculated and measured hardened depths yielded values of the effective coupling coefficient as a function of the beam interaction time. The effective coupling coefficient decreases from ≈1 at the shortest interaction times to ≈0.6 at the longest. Reduction of the effective coupling coef-ficient is associated with destruction of the copper selenide layer.

Paper Details

Date Published: 12 November 1986
PDF: 8 pages
Proc. SPIE 0668, Laser Processing: Fundamentals, Applications, and Systems Engineering, (12 November 1986); doi: 10.1117/12.938880
Show Author Affiliations
John R Bradley, General Motors Research Laboratories (United States)

Published in SPIE Proceedings Vol. 0668:
Laser Processing: Fundamentals, Applications, and Systems Engineering
Walter W. Duley; Robert W. Weeks, Editor(s)

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