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| Finite Element Simulation for Laser Direct Depositing Processes of Metallic Vertical Thin Parts（1） |
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Cite this article:
. Finite Element Simulation for Laser Direct Depositing Processes of Metallic Vertical Thin Parts（1）. Acta Metall Sin, 2006, 42(5): 449-453 .
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Abstract Abstract. RP/M is an advance technology based on build-up and discrete idea, and Laser direct deposition by coaxially feeding the powders to laser melting pool is a RM technology in general use. During depositing metallic components the variation and control of temperature field have been priority research problem in the research works all along, and major research object for this problem is simulating real temperature field during the deposition by finite element method. Finite-element model to simulate the temperature field in depositing process of vertical thin wall samples is created, and Solid-liquid coupling thermal conduction problem and heat content within Solid-liquid dilution zone are treated by use of equivalent thermal conductivity and enthalpy potential method in the paper. The simulating results objectively exposure the characteristics on the temperature field during depositing the vertical thin wall samples of 316Lstainless steel. By means of analyzing the simulation results, it is obtained that mean cooling velocity of the melting pool is at 103℃/S order of magnitude in the temperature upward 700℃，and the cooling velocity merely is at 101℃/S order in the temperature upward 240℃. Fluctuating temperature of the substrate undergoes three stages: elevation, stable, descends, and the thermal conduction in the substrate has little influence on the cooling velocity of the melting pool at the descending period. The conformity of the simulating result data with the experimental findings in public literatures is very well.
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Received: 16 September 2005
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