Electrical discharge metal matrix composite coating on duplex stainless steel and its wear behavior under different environmental conditions

The current study evaluates the effect of inclusion of nickel with a varying concentration that influences the tribological behaviour of the electrical discharge coating over the duplex stainless steel. Aflaw free coating was obtained while increasing the nickel weight percentage with an improved hardness of 915HV0.5 to 1100 HV0.5 that trice the time of the substrate. Wear test is carried under a higher temperature of 600 degrees C in Pin-On-Disc tribometer with the varied environmental condition pin and chamber shows that increase in the concentration of nickel reduces the formation of oxides, surface roughness, and thermal cracks. In addition, electrode copper with carbon from the dielectric deposited within the coating owns strain rate, this significantly accommodates the hard carbides debris as third body wear between the contacts. Analyzing of surface morphology was detailed through 3D optical profilometer together with microstructural transformation, wear mechanism and coating thickness by Scanning Electron Microscope followed through Energy Dispersive Spectroscopy for elemental analysis and hardness through Vickers Microhardness. Moreover, the pyrolysis carbon with nickel accommodates the hard carbides with an inferior frictional coefficient and specific wear rate.