Study on laser cladding process parameters of Fe-based alloy based on numerical simulation

Abstract

Using 45 steel as the substrate, laser cladding Fe-based alloy powder on the surface was proposed to improve the surface wear resistance and hardness, and partially replace the cold working die steel in the small batch production stage. ANSYS Workbench was used to simulate the heat transfer and temperature field distribution in the laser cladding process of iron base alloy. The thermal properties of the substrate and the cladding material were set up, and the finite element model was established by Gaussian heat source. The temperature field under different laser cladding process parameters was simulated to obtain the temperature distribution of molten pool. According to the metallurgical bonding between the substrate and the coating, and taking the dilution rate of the cladding layer as the basis of quality evaluation, the optimal process parameter combination of laser cladding Fe-based alloy powder of 45 steel substrate is determined as follows: laser power 1400W, scanning speed 8mm/s, spot diameter 3mm. The results provide technical data support for the engineering application of laser cladding of Fe-base alloy on 45 steel substrate.