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Computer Modelling of Heat Flow Following Laser Surface Melting

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Technical Report

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Martec Limited Halifax, N.S. Canada

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A transient three-dimensional heat transfer program called LASER1 which describes the thermal history of a specimen after laser treatment with a scanned continuous laser, has been developed following the experimentally verified method of A.F.A. Hoadley, M. Rappaz and M. Zimmerman 3. The program was based on the conservation of energy for the treated specimen, and the three-dimensional implicit finite difference method. The surface of the melting pool was assumed to be flat. The fluid dynamics effects of the melting pool were neglected. The properties of the treated material were assumed to be linear functions of temperature for solid phase, but independent of temperature for the liquid phase. A windows based and easy-to-user interface program, was also developed to guide the users with the provision of the temperature dependent thermal and optical properties of the material, with the provision of the laser beam and operational parameters and with the display of the computational results. The program developed in this report was used to simulate the laser surface melting for the eutectic alloy Al-Cu 33 Wt Pet over a range of traversing speeds between 0.2 to 5.0 mls. Excellent agreement has been obtained from the comparison between the current simulation results, and the simulation and the experimental results obtained in Reference 3

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