Laser melting and subsequent solidification of a surface layer
Abstract
The effect of stationary and moving high intensity heat fluxes, achieved by laser or electron beam radiation, on the surface melting and subsequent solidification variables of metallic substrates was investigated. The problems considered are the rapid melting and solidification of the surface layer of a semi-infinite solid subjected to: (1) step function stationary uniform heat flux over a circular region on its bounding surface when heat flow conditions are almost unidirectional; (2) step function stationary uniform and Gaussian heat flux distributions over a circular region on its bounding surface when heat flow is two-dimensional; and (3) uniform and Gaussian heat flux distributions over a circular region on its bounding surface moving with a constant velocity, U, in the y-direction. Microstructural observations made on an Al-4.5% Cu alloy substrate are described and the findings are compared with the general trends established in the quasisteady state moving flux calculations.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1979
- Bibcode:
- 1979PhDT........78H
- Keywords:
-
- Heat Flux;
- Laser Heating;
- Melting;
- Metal Surfaces;
- Solidification;
- Surface Layers;
- Aluminum Alloys;
- Computer Programs;
- Copper Alloys;
- Electron Beams;
- Liquid Phases;
- Solid Phases;
- Substrates;
- Lasers and Masers