SELECTIVE LASER MELTING OF MULTI-MATERIAL VZH159-CUCR1ZR SAMPLES

Multi-material approach in the design and manufacture can improve performance of parts. Additive manufacturing can be a promising technology when it comes to creating complex multi-material products. The emerging field of the research is producing multi-material parts from heat-resistant alloys, including nickel alloys, which can be used in the aerospace industry. Therefore, the study analyzed the influence of selective laser melting parameters of multi-material VZh159-CuCr1Zr samples and their heat treatment on porosity, structure, chemical and phase composition, as well as the hardness in interface zone. The multi-material samples were fabricated on SLM 280HL selective laser melting machine. Different process parameters were used for studying the effect on the porosity in the interface zone of multi-material samples. The results of the study showed that only a significant increase in energy leads to a decrease in porosity in the interface zone of multi-material samples. For the CuCr1Zr/VZh159 interface zone, it was 325 or 375 J/mm3 (with 12 layers of the interface zone), and for the VZh159/CuCr1Zr transition zone, it was 120 or 140 J/mm3 (with 8 layers of the interface zone). Heat treatment did not significantly affect the microstructure and chemical composition of the transition zones. The sizes of the transition zones were 300 µm when the CuCr1Zr alloy was built on VZh159 and 250 µm when the VZh159 alloy was built on CuCr1Zr, respectively. After the heat treatment, phase peaks in interface zone corresponded to phases from both alloys used. Various heat treatments have a significant effect on the microhardness of the alloys they are intended for.