Process parameters optimization and mechanical properties of forming parts by direct laser fabrication of YCF101 alloy

In this paper, the process parameters optimization and performance testing in direction laser fabrication were studied. Some critical parameters that affect the part properties and process stability were researched and discussed in detail. The results show that the parameters (power, scan speed, and powder feed rate) affect the track geometry, and then influence the quality of the cladding specimens. The z-axis increase quantity plays an essential role in fabricating stability. The defects caused by laser opening and closing can only weaken to a certain extent by uniformly distributing the position of laser power on. Crack and pore inside the forming, surface defects, and non-uniform microstructure must be avoided during the parameters optimize and process control, because these defects can cause the failure of the process. The surface morphology, crack and pore in cross-section, micro-hardness, wear resistance and strength were measured and analyzed to select or optimize the optimal process parameters. With optimizing process parameters, the stability of laser cladding process and mechanical properties of the part can be significantly improved.