Experimental Determination Of The Coupling Coefficient In Laser Surface Hardening Of Steel

John R Bradley

doi:10.1117/12.938880

12 November 1986 Experimental Determination Of The Coupling Coefficient In Laser Surface Hardening Of Steel

John R Bradley

Proceedings Volume 0668, Laser Processing: Fundamentals, Applications, and Systems Engineering; (1986) https://doi.org/10.1117/12.938880
Event: 1986 Quebec Symposium, 1986, Quebec City, Canada

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.

Citation Download Citation

John R Bradley "Experimental Determination Of The Coupling Coefficient In Laser Surface Hardening Of Steel", Proc. SPIE 0668, Laser Processing: Fundamentals, Applications, and Systems Engineering, (12 November 1986); https://doi.org/10.1117/12.938880

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available