Development of technique(s) for cladding of metal-ceramic composite layer on metallic surface(s)

Abstract

Steel coating to enhance corrosion and wear resistance has been a research focus for a long time. Laser cladding of low carbon mild steel with Aluminum Silicon Carbide metal matrix composite and Aluminum Molybdenum carbide metal matrix composite has been investigated in this thesis. Laser cladding process was implemented using a 4.4 kW (Nd:YAG) laser cladding machine with multi powder hopper feeding system Laser power and laser scan speed has been changed to form the experimental matrix. Laser power was changed from 0.9 kW to 1.2 kW with step 0.1 kW. Laser scan speed was chosen to be 0.9 m/min to 1.1 m/min with step 0.1 m/min.With maintaining spot diameter constant, preheating temperature, standoff distance, carrier gas flow rate and powder feed rate at values of 4 mm , 400 °C, 12 mm , 2 l/min., 1.8 l/min respectively .