Abstract:Multi physics field simulation on the temperature field of two CoCrNiMox and CoCrNi(WC)x high entropy alloy coatings prepared by laser cladding on the TC4 surface was conducted by COMSOL. A three-dimensional transient model of multiple physical fields was established, while considering heat transfer, fluid heat transfer, convection, and surface cladding layer growth process. The effects of scanning speed, laser power, and other parameters on the temperature field of CoCrNi based alloys with different Mo and WC contents were analyzed and compared. Through simulation results, it can be concluded that the main driving force of the molten pool during laser cladding is the Marangoni force. For the same coating material, coatings with higher Mo content have lower maximum temperature fields, but higher maximum velocity and pressure fields. When the coating powder is different, the temperature field, velocity field, and pressure field formed by CoCrNiMo2 are all lower than those formed by melting CoCrNi(WC)2. As the laser power gradually increases, the center temperature of the molten pool generated by laser cladding also increases, and the width and depth of the molten pool will also increase. As the scanning speed gradually increases, the maximum temperature at the center of the melt pool significantly decreases, the starting position of the cladding layer is significantly delayed, the thickness of the cladding layer is significantly reduced, the geometric size of the melt pool becomes smaller, and the symmetry of the morphology at the bottom of the melt pool becomes worse.