For high tech industry to find physical characteristics of thin clad layer of Stellite-6 (Cobalt Base Alloys) deposited by laser cladding

This research was aimed at the development of production methods and tools needed to achieve a high degree of reliability and integrity of laser cladded components manufactured at high production rate. These targets can be realized by understanding the laser/materials interactions during laser cladding. A thin surface layer of cobalt-based alloys (Stellite-6) was deposited on mild steel substrates by a coaxial laser cladding process. This process could produce a thin surface layer of less than 0.71 mm with low energy input. Laser-clad Stellite-6 specimens exhibited refined dendritic microstructure. There are interdendritic eutectics which consist of either small-scale carbides or compounds which are intermetallic and randomly distributed in a cobalt-rich solid solution, unlike the lamellar structure as observed in conventional weld overlays. The hardness values of the laser-clad layers were generally higher than those of conventional welding deposits owing to the refined effect. The wear and corrosion resistance of S-6 specimens were considerably better .Experimental results indicated that wear and corrosion characteristics of the Stellite-6 specimen were excellent; however, Proper powder feed rate and preheating were required to avoid cracking in the laser cladding process. Moreover, several approaches and steps were taken to identify the optimal process conditions to produce satisfactory clad layers with desired hardness and low residual stresses to avoid defects and Cracking and distortion