研究目的

The aim of this work is to evaluate the ageing behaviour of AlSi10Mg alloy LMF processed using both, cold and hot, platforms. In both cases, samples have been aged in the as-built state, after printing as well as after solution annealing. The ageing behaviour of the alloy in the two initial conditions was investigated by differential scanning calorimetry and the ageing curve. The effects of different heat treatments have been studied by means of a microstructural analysis and tensile testing.

研究成果

The best strength-ductility combination was obtained for samples printed on the cold platform, aged in the as-built condition. The very fine cellular solidification microstructure combined with the strong supersaturation of the as-built structure resulted in a very good ageing response. The platform preheating causes the uncontrolled ageing during printing, leading to lower strength and poor/no response during artificial ageing. The mechanical properties are also disappointing, showing much lower strength than similar samples produced with the cold platform, with no appreciably higher fracture elongation. It is believed that some improvement could be obtained by lowering the preheating temperature.

研究不足

The study highlights the limitations of using a hot platform for LMF processing of AlSi10Mg alloy, which leads to uncontrolled ageing during printing, resulting in lower strength and poor response during artificial ageing. The mechanical properties are also disappointing, showing much lower strength than similar samples produced with the cold platform, with no appreciably higher fracture elongation. It is suggested that some improvement could be obtained by lowering the preheating temperature.