Optimization of Process Parameters for Laser Cladding of Ni-Based Coating on Titanium Alloy Substrate
Authors: Y. Zhang, L. Wang, H. Liu, J. Chen
Laser cladding is an advanced surface modification technique used to enhance the wear and corrosion resistance of titanium alloys. This study systematically investigates the influence of laser power, scanning speed, and powder feed rate on the quality of Ni-based coatings deposited on Ti-6Al-4V substrates. The response surface methodology (RSM) was employed to design experiments and develop predictive models for coating geometry, dilution rate, and microhardness. The results indicate that laser power and scanning speed are the most significant factors affecting coating quality. Optimal parameters were identified as laser power of 1.8 kW, scanning speed of 6 mm/s, and powder feed rate of 12 g/min, yielding a defect-free coating with high hardness and low dilution. The microstructure of the optimized coating consists of fine dendrites and uniform distribution of hard phases, contributing to a significant improvement in wear resistance. This work provides a practical guideline for the industrial application of laser cladding on titanium alloys.
