Evolution of microstructure and performance of plasma cladding coating and interface with thermomechanical coupling effects

ABSTRACTCobalt-based coatings were fabricated on FV520B substrate by plasma cladding technology. Evolution of performance and microstructure of cobalt-based coating and interface under thermomechanical coupling action was studied. Results elucidated that the nano-hardness of the compressed material changes obviously, but the interface structure can maintain good hardness stability. Wear resistance of coatings subjected to high-temperature compression is significantly enhanced, and the higher compression temperature further increases the wear resistance of the coating. Torsion and deformation of microstructure occur with the increasing of deformation amount. Obvious plastic deformation occurs at the interface. The original dendrite morphology in the coating completely disappeared with the increase of temperature and deformation amount, and there is a series of microstructure changes contribute to the improvement of performance.