Study on SLM Forming Parameters of Al2O3/CoCr Metal Matrix Composites

In the present study, a finite element-based numerical simulation approach was employed to investigate the temperature field distribution and variations in molten pool dimensions during the selective laser melting (SLM) forming process of Al2O3/CoCr metal matrix composites. Building on this foundation, the present work explored the regulatory effects of volumetric energy density (VED) on the performance of SLM-fabricated components. Ultimately, the optimal process parameters for the selective laser melting of Al2O3/CoCr metal matrix composites were identified and established. The results show that when the laser power is in the range of 150–250 W and the scanning speed is 700–1100 mm/s, it is beneficial to the SLM forming of Al2O3/CoCr metal matrix composites. When the VED is between 133.3 J/mm3 and 171.4 J/mm3, the microstructural defects of the composite are the least. The optimal SLM process parameters are finally determined as follows: laser power 200 W, scanning speed 700 mm/s, scanning line spacing 0.06 mm, and hatch spacing 0.03 mm.