Absorption of CO2 laser beams by metallic alloys. Application to laser thermal treatment
Abstract
The electromagnetic absorption at 10.6 micron wavelength was studied for low alloy steels and titanium alloys, in order to predict the feasibility of continuous CO2 laser thermal treatments. Laser calorimeter and elliptic mirror reflectometer were used. The results show a strong influence of the surface finish. The absorption increases almost linearly with temperature. A two dimensional numerical model of heat diffusion was developed to describe the temperature evolution of 15 x 15 x 2 mm specimens under a 3 kw laser beam. The heat absorbed, 200 to 450 W per sq cm, is insufficient to obtain temper effects.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- July 1985
- Bibcode:
- 1985STIN...8711990S
- Keywords:
-
- Carbon Dioxide Lasers;
- Laser Applications;
- Laser Beams;
- Steels;
- Thermal Absorption;
- Thermodynamic Properties;
- Titanium Alloys;
- Calorimeters;
- Heat Measurement;
- Heat Treatment;
- Reflectometers;
- Two Dimensional Models;
- Lasers and Masers