Adaptive Regulation of Mechanical Properties of Products During Selective Laser Melting as Part of their Life Cycle

Statement of the problem. The article is devoted to a study of selective laser melting, which is one of the most promising methods of additive technology. Both physical and numerical aspects of the process are considered, with special attention being paid to thermal phenomena, powder density dynamics, and the resulting thermal and mechanical stresses. Results. A system of nonlinear equations describing unsteady heat transfer in the structure of the printed product is refined. Numerical finite element modeling takes into account the melting process of metal powder, thermal shrinkage and changes in material density, and the development of thermal and mechanical stresses. As a result of the simulation, a "melting hysteresis" is observed, i. e., a change in dynamic density and temperature at the beginning of the laser passage, which allows one to control the properties of a finished product. Conclusions. The results obtained make it possible to optimize the parameters of the laser process: energy, scanning speed, etc. to obtain high-strength metal parts with specified mechanical and physical characteristics.