Achieving Maximum Performance of a Laser Clad Ni-based Coating Through Optimization of Laser Remelting Processing Parameters
Y.H. Yang, J.H. Li, F.P. Yao and F.Y. Zheng
Through simulation based on the Workbench platform in ANSYS the optimal laser remelting process parameters were identified to achieve the maximum performance of a Ni60 coating laser clad onto a H13 steel surface. Laser remelting with a fibre laser was conducted according to the optimal process parameters obtained and the coating morphology, microstructure and microhardness after remelting were analysed. The results show that when the laser power was 1200 W and the scanning speed was 4 mm/s the remelted coating has the smallest residual stress value, pores in the coating were basically eliminated, the organization was dense, the hardness improved and the coating quality was the best. When the laser power was 900 W and the scanning speed was 2 mm/s the maximum residual stress value of the remelted coating was slightly smaller than that of the un-remelted coating, the coating morphology quality was better, and there were very few bubbles.
Keywords: Fibre laser, Ni60, H13 steel, powder, laser cladding, laser remelting, morphology, microstructure, residual stress, finite element analysis (FEA)