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Microstructure and wear resistance of laser clad cobalt-based alloy multi-layer coatings
Authors:Li Mingxi  He Yizhu  Sun Guoxiong
Institution:

a Research Center for Laser Processing, School of Material Engineering, Anhui University of Technology, Maanshan 243002, China

b Department of Mechanical Engineering, Southeast University, Nanjing 210096, China

Abstract:Multi-layer Co-based alloy (HMSP 2537) were deposited on Ni-based superalloy plate with a TJ-TL-T5000 type CO2 laser. Sections of such coatings were examined to reveal their microstructure and phase composition using optical microscope, scanning electron microscope (SEM), and X-ray diffractometer (XRD). The hardness and wear resistance of the coatings were tested. The results showed that the prime phase (γ-Co dendrite) and other phases, such as CrNi, Co7W6, and Cr23C6 existed in the coatings. Dendrite or cellular microstructures were observed perpendicular to the interface, and coarsening microstructures were obtained as more layers deposited. Dendrite paralleling to laser scan speed was also found near the top surface of the last layer. Fine microstructures of γ-Co dendrite and lamellar eutectic in inter-dendritic regions strengthened the coatings. Microhardness and wear resistance of the coatings were much higher than that of substrate but slightly decreased with layers increased.
Keywords:Co-based alloy  Laser cladding  Dendrite  Wear resistance
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