An Experimental Design Method to Selective Laser Sintering of Molybdenum-based Alloy(TZM) Powder

摘要

Direct laser sintering of metal, as one of important development in rapid prototyping technologies, is discussed in this paper. this paper an outcome of the application of statistical design experiments to the process of selective laser sintering (SLS) on molybdenum-based alloy(TZM) powder using continuous wave CO2 lasers with 200 watts average power. It is intended to study the effects variation of sintering parameters: layer thickness and hatching distance (side step) on the density, hardness and porosity of the sintered products. Experiments have been done according to second order central composite rotatable design and response surfaces the outputs are plotted after regression analysis. It has been observed that increasing layer thickness and hatching distance results in an increase in porosity that diminishes the hardness and density.