Features of the process of selective laser melting from structural steel 28Cr3SiNiMoWV

Abstract

Selective laser melting is one of the most sought-after additive manufacturing technologies that can meet the growing needs of the industry. Structural high-strength steels have always been in demand for the manufacture of critical parts, especially in heavy and power engineering. The features of the process of selective laser melting of high-strength structural steel 28Cr3SiNiMoWV of domestic production are studied on the SLP-250 additive complex developed at the Bauman Moscow State Technical University together with MCLT LLC. The input control of the powder material was carried out, including granulometric, morphological and chemical analysis. To determine the optimal modes and the influence of the main technological parameters on the quality of fusion and the presence of defects in the grown samples, a multifactorial experiment was performed. The effect of process parameters and thermal cycles on the main defects of selective laser melting, i.e., porosity and cracking, is estimated. The porosity of the samples obtained was less than 0.2%. To get a defect-free structure and to grow products from powdered steel 28Cr3SiNiMoWV, the growing modes are optimized.