Bauman Moscow State Technical University, Moscow, Russia:
I. I. Binkov, Category 2 Engineer, Centre for Additive Technologies, e-mail: binkovii@bmstu.ru
A. O. Denezhkin, Postgraduate Student at the Department of Laser Technology in Mechanical Engineering
D. S. Kolchanov, Associate Professor at the Department of Laser Technology in Mechanical Engineering, Candidate of Technical Sciences
A. A. Drenin, Senior Lecturer at the Department of Laser Technology in Mechanical Engineering, Candidate of Technical Sciences

This paper examines the process of manufacturing specimens out of aluminium alloy ASP-30 (a counterpart to AlSi10Mg) using the process of selective laser melting (SLM) and equipment made in country. The paper gives a brief description of the equipment developed by BMSTU’s MT-12 department in collaboration with the Centre for Additive Technologies (NOTs “TsAT”). The authors looked at the size distribution, as well as chemical composition and morphology of the obtained materials. In order to establish suitable process parameters, three batches of specimens were prepared under various process parameters. The aim behind making the first batch of specimens was to determine the best orientation of the part in relation to the platform. When making the second and the third batches, the goal was to find the most suitable process parameters, such as beam scan speed, laser radiation power, powder layer height. The authors examined the mechanical properties of the synthesized materials, as well as their bulk porosity and subsurface layer, surface roughness, microstructure and fracture surface. A chemical analysis was performed for the microstructure of the sections. Having analysed the findings, the authors were able to draw conclusions about the orientation of the part in relation to the base plate that would allow to obtain optimum mechanical properties, the optimum process parameters, the required energy input, the microstructure and the distribution of elements in it. Thus, it was established that a vertical orientation would be most beneficial; the highest ultimate strength of 360 MPa was achieved at a layer height of 20 μm and a bulk energy of ~78 J/mm³; the bulk porosity was 2.5% and the elongation at break was 1.56%, which correspondsto brittle fracture mode.

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