Peter the Great St. Petersburg Polytechnic University, Saint Petersburg, Russia

А. P. Мaksimov, Engineer, Scientific and Educational Center “Structural and Functional Materials”, maksimov_ap@spbstu.ru
А. V. Repnin, Assistant, Scientific and Educational Center “Structural and Functional Materials”, Candidate of Technical Sciences, repnin_av@spbstu.ru
Е. V. Borisov, Associate Professor, Scientific and Educational Center “Structural and Functional Materials”, Candidate of Technical Sciences, Associate Professor, borisov_ev@spbstu.ru
А. А. Popovich, Director of the Institute of Mechanical Engineering, Materials and Transport, Doctor of Technical Sciences, Professor, director@immet.spbstu.ru

The research is devoted to the development of production technology for multi-material samples of the 316L/AlSi10Mg system by selective laser melting (SLM). The relevance of the work is due to the complexity of joining materials because of the formation of intermetallics in the contact zone. Experimental studies have been carried out on a 3D LAM Mini SLM unit using spherical powders of 316L steel (fraction of 20–63 microns) and Al-Si10Mg aluminum alloy (fraction of 10–63 microns). Within the frame of the work, experiments have been performed with varying the parameters of the printing process and the configuration of the transition layer. It has been established that the production of samples without heated platform leads to the detachment of the aluminum alloy from the steel. The use of platform heated up to 300°C in combination with a gradient transition layer has improved the quality of the joint. The nonporous compound has been obtained by sequentially applying two and three transition layers with a thickness of 200 microns with a gradual increase in the energy density of laser radiation from layer to layer. Optical microscopy analysis of the microstructure has confirmed the formation of a continuous melting zone without cracks and layer separation. Scanning electron microscopy has revealed that the width of the transition zone is ~300 microns. X-ray phase analysis has not revealed the presence of intermetallics in the transition zone. Microhardness measurements have demonstrated a gradient change in properties from steel (208–239 HV) to aluminum alloy (100–131 HV). The results obtained confirm the possibility of forming a nonporous compound of aluminum and steel by the SLM method using a heated build platform and gradient transition layer.
The research was carried out with the financial support of the Ministry of Science and Higher Education of the Russian Federation (Agreement No. 075-15-2024-562 dated April 25, 2024).

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