Influence of Process Parameters on the Performance of Selective Laser Melting Formed NiCoCr Medium-entropy Alloy
This study focused on the NiCoCr entropy alloy powder produced by gas atomization,and 16 sets of Selective Laser Melting(SLM)forming process parameters were designed using the method of controlled variables.The influence of different process parameters on the density,microstructure,and mechanical properties of SLM-formed NiCoCr medium-entropy alloy were studied.A mathematical model for the influence of each process parameter on the density of the alloy was established using J MP software,and the main influencing factors of the microstructure and properties of the SLM-formed NiCoCr medium-entropy alloy were identified.The results show that the laser energy density has the greatest influence on the density of NiCoCr medium-entropy alloy,followed by the laser scanning speed and scanning interval,while the laser power has a smaller influence.The optimal process parameters for the NiCoCr medium-entropy alloy are:laser power of 263 W,scanning speed of 1 260 mm/s,and laser energy density of 87 J/mm3,with a corresponding sample density of 99.69％,Vickers hardness of 308.4HV0.5,and room temperature tensile strength,yield strength,and elongation of 616 MPa,511 MPa,and 39％,respectively.
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