Microstructure and Mechanical Properties of Cobalt-Based Stellite 6 Alloy Coating Fabricated by Laser Engineered Net Shaping (LENS)

摘要

The results of microstructure and mechanical properties evaluation of a Stellite 6 (Co-6) alloy depositedon X22CrMoV12-1 substrate by the (LENSTM) technology. Specific properties of the Co-6 alloy areuseful of excellent wear resistance at elevated temperature and corrosive environments as protectivecoating material in many applications, e.g. in steam turbine components. The results of investigationsproved that the LENS technology is one of the most effective manufacturing technique of the Co-6 alloycoatings (especially deposited on complex-shape turbine parts). The chemical homogeneitymicrostructure and phase analysis of obtained Co-6 coatings were carried out by a SEM/EDS/EBSDand XRD analysis. The room temperature strength and ductility of the LENS processed layers weredetermined in microhardness investigations. The Co-6 alloy coatings structure is rapid crystallized dueto interaction of laser radiation, and consist of dendrites with average size equal 5 μm which areseparated by a network of eutectic.