: The main objective of this thesis is study microstructure, Vickers microhardness, dilution, phase formation, wear and corrosion behavior of stellite 6 cladding on carbon steel without and with martensitic and austenitic stainless steel interlayer. stellite 6 were deposited on carbon steel with 1, 2 and 3 layers, martensitic and austenitic stainless steel interlayer were deposited on carbon steel, then stellite 6 were cladded on interlayers. The process of welding was Gas Tungsten Arc Welding (GTAW). The microstructures of these coating were studied by optical microscopy, scanning electron microscopy (SEM) and X-Ray Diffraction. The specimens were investigated by energy dispersion spectroscopy (EDS) and micro hardness test. Wear tests were carried out using pin-on-disk. The worn surfaces were examined by scanning electron microscopy. For investigation of the corrosion behavior the electrochemical studies of samples immersed in a 3.5% NaCl solution were carried out. Results of this investigations show that the micro structures of these claddings include chromium carbides phases dispersed in the matrix of the Co-based alloy with dendritic structure. When the layers of stellite increased, hardness, corrosion and wear resistance increased and dillution decreased. The mechanism of wear was abrasive and delamination wear. After the wear test HCP phase of cobalt and chromium oxides were formed. Coefficient of friction was measured between 0.2-.28. Use of austenitic stainless steel interlayer decreased dilution of iron, that improved the corrosion resistance. So the specimen with austenitic stainless steel interlayer has the best corrosion behavior among the other cladding specimens. Use of martensitic stainless steel interlayer type 410 increased the dilution of iron and decreased wear resistance of stellite. Keywords: stellite 6, dilution, cladding, Gas Tungsten Arc Welding, interlayer
