Abstract
Finite element modeling (FEM), microscopy, X-ray computed tomography (CT) and mechanical property tests were used to study the microstructure, porosity and mechanical proper-ties of an AlSi10Mg alloy produced by selective laser melting (SLM). The simulation of the melt pool and thermal history under different energy densities produced an optimized result with an energy density of 44.5 J·mm-3. The high cooling rate during the SLM process significantly refined the previousα-Al dendrites. The growth direction of the network-like Al-Si eutectic structure at dif-ferent orientations confirmed the anisotropic nature of the microstructure. Furthermore, the micro-hardness, tensile testing and fracture analysis results proved that there were no obvious distinctions in the strength between the transverse and longitudinal directions, and that the ductility was aniso-tropic, possibly due to the shape and distribution of the pores. The pores measured by X-ray CT at different energy densities confirmed that the sphericity of the pores was inversely related to pores volumes. With optimized processing conditions, the porosity of the selective laser melted sample decreased leading to the improved fabricated fuel system component via SLM.
基金项目
authors would like to appreciate the financial support from the National Key Research and Development Program of China( 2018YFB1106400)
国家科技期刊平台
NSTL
维普
万方数据