Determination of thermal stress distribution in metallic layer during selective laser sintering using finite element method

Author： Ramu Patil Makarand Yadava Vinod

Publisher： Inderscience Publishers

ISSN： 1368-2148

Source： International Journal of Manufacturing Technology and Management, Vol.13, Iss.2-3, 2008-01, pp. : 280-296

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Abstract

Selective Laser Sintering (SLS) is used to make strong and hard metallic functional components layer by layer directly from several kinds of metallic powders. The high laser power (about 1 kW) during SLS results in high-localised temperature rise (about 1000 1500°C). Thermal stresses are generated due to temperature gradient. The study of thermal stress distribution within the metallic layer is important from the quality of the product point of view. A transient Finite Element Method (FEM)-based 2D temperature and thermal stress model has been developed to calculate the temperature distribution and thermal stress distribution within a single metallic layer formed on the powder bed using SLS. This paper predominantly deals with the effects of laser power and time of scanning on thermal stress distribution within a single layer of Ni-based alloy (82.8 %Ni, 9.5 %Cr, 2%B, 3%Si, 2.3%Fe, 0.4%C) during SLS.