الفهرس 
Steel properties and applications
Experimental workOnly 14 pages are availabe for public view
 |  | from | 99 |  |  |
| | | from | 99 | | |
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 .
Clad geometry aspects have been investigated through different laser energy densities. Clad height, width, penetration are measured geometry aspects that were measured on the cross section of the samples using microscope. SEM and EDX analysis were implemented on three samples from each clad material at different energy density range to check the diffusion layer formation. Mechanical and chemical properties of the different clad layer material have been investigated at laser energy density of 25.48 J/mm^2 in which full clad layer was obtained.
Results showed that clad geometry gets better forming clad layer with the increase of energy density and a slight increase in clad layer quality has been observed at the Al-SiC clad. Wear results has shown that Al-SiC has the best wear resistance while Al-Mo2C was the worst. Corrosion resistance results showed that Al-Mo2C has the best corrosion resistance and Al-SiC was lower but both still better than uncl1added mild steel.