Beam Shaping For Optimal Control Of CO[sub]2[/sub] Laser Surface Hardening

D. Kechemair; L. Sabatier; E. Luneville; D. Gerbet

doi:10.1117/12.950582

20 June 1989 Beam Shaping For Optimal Control Of CO₂ Laser Surface Hardening

D. Kechemair, L. Sabatier, E. Luneville, D. Gerbet

Proceedings Volume 1031, 7th Intl Symp on Gas Flow and Chemical Lasers; (1989) https://doi.org/10.1117/12.950582
Event: 7th International Symposium on Gas Flow and Chemical Lasers, 1988, Vienna, Austria

Abstract

Some industrial laser applications demand high quality and repeatability levels, and therefore precise control of induced effects. In the case of CW CO2 surface hardening, the microstructural transformation depends on the initial structure and on thermal cycles, and has been widely studied. In order to control these thermal cycles accurately, optimal intensity distributions have been computed with the help of a two dimensional finite element code. The choice of the cost function to be minimized appeared to be quite important, in agreement with theoretical considerations. The cost function is minimized under a set of constraints chosen to describe quenching of a 0.35% weight Carbon low alloyed steel. Numerical results exhibit distributions constituted of several "strips". Such intensity distributions have then been realized and characterized with ETCA beam analysers on the Laser Lab workstation devoted to laser-material interaction studies. A kaleidoscope has been used either for top hat intensity shaping or for interference patterns creation. Both Spectra-Physics 5kW beam and CI1000 after amplification by the 5kW cavity have been used in experiments. Temperature measurements have been performed during treatment both in the samples bulk and on their surface. The microstructure after transformation has been characterized by hardness measurements.

Citation Download Citation

D. Kechemair, L. Sabatier, E. Luneville, and D. Gerbet "Beam Shaping For Optimal Control Of CO₂ Laser Surface Hardening", Proc. SPIE 1031, 7th Intl Symp on Gas Flow and Chemical Lasers, (20 June 1989); https://doi.org/10.1117/12.950582

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