| Abstrakt: |
In the modern manufacturing of parts of metal powder, the method of Selective Laser Melting (SLM) has become widespread. In Ukraine, the LLC "Additive Laser Technologies of Ukraine" is engaged in the development of equipment for manufacturing parts of metal powders by SLM technology. Nowadays, for this equipment, the relevant task is the development of a procedure for choosing the parameters of the process of melting metal powder, providing the necessary mechanical and service properties of parts. For the investigations, three experimental cylindrical specimens of Co-Cr-Mo alloy were made in the vertical direction for tensile test according to ISO 6892:2019 -- with a diameter of the working zone of 5 mm, with a controlled stop at a height of 18 mm from the beginning of the working zone, the total length of which is 28 mm. As a result of the analysis of the values of mechanical properties, it was found that the ultimate strength of the experimental specimens of Co-Cr-Mo alloy made by SLM technology with a controlled stop during 24 h decreases compared to the specimens made without a controlled stop -- by ~13 %, relative elongation -- by ~1 % and reduction in area -- by ~17 %. It was found that for the experimental specimens with a stop in the manufacturing process, the deviation from the average values was: for ultimate strength ~11 %, relative elongation ~62 % and reduction in area of ~21 %. This is predetermined by failure of one of the specimens at the place of a stop. The use of parts with a production defect (stop) should be significantly restricted respective to a probable significant softening and embrittlement of a product. [ABSTRACT FROM AUTHOR] |
