RESEARCH OF THE INFLUENCE OF SELECTIVE LASER MELTING PARAMETERS ON THE FORMATION OF DEFECTS AND MICROSTRUCTURE IN NICKEL-BASED SUPERALLOYS

The paper investigates the effect of various parameters on the selective laser melting (SLM) process on the formation of defects and microstructure in nickel-based superalloys. Experimental specimens were fabricated using a High-Temperature Layer-by-Layer Laser Synthesis Plant “Mercury” equipped with an inductive high-temperature heating system. By varying the energy parameters of the SLM, data on the dependence of the linear energy density on the number and types of emerging defects, such as macro-cracks and micro-defects, were obtained. The results showed that an increase in linear energy density contributes to a significant reduction of defects in the structure of the samples. Based on the analysis, the features of microstructure formation and the causes of defects at different SLM modes were revealed. The obtained results can be used to optimize the process parameters and improve the quality of products made of nickel-based superalloys manufactured by the additive manufacturing method.