Accession Number:

ADA128766

Title:

Surface Melting and Alloying of Metals by the CO2 Laser.

Descriptive Note:

Final rept. 15 Jun 79-31 Oct 82,

Corporate Author:

BATTELLE COLUMBUS LABS OH

Report Date:

1983-04-29

Pagination or Media Count:

60.0

Abstract:

This report describes a program which investigated the laser-material interactions for pulsed and continuous wave C02 lasers with iron and iron-4 wt. carbon surfaces. The thermal coupling coefficient of pure iron increased with increasing laser fluence, with the most significant increase occurring just before the damage threshold. The iron-carbon alloy had a higher coupling coefficient which was relatively independent of fluence. The pulsed and CW C02 lasers were also used to surface melt cast irons. Very short interaction times developed thin, rapidly solidified featureless melts on the cast iron surfaces. These layers were identified as a carbon saturated epsilon phase. In addition, laser surface alloying of Fe-0.8C, Fe-1.4C and Fe-2.8C alloys with Mo was studied. The resulting melt layers were generally chemically uniform and showed the presence of ferrite, martensite, and M02C and an M6C carbide. Author

Subject Categories:

  • Lasers and Masers
  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE