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Metal Matrix Composite (Carbides of W/Cr in NiCr-Matrix) coating on stainless steel
- Composite coating development such as WC reinforced Ni-Cr metal matrix
- 6 kW fiber-coupled high power diode laser systems integrated with an 8-axis robotic workstation and an off-axis powder feeding subsystem under argon atmosphere were used
- Distribution of WC particles with effective bonding at particle-matrix interface
- Defect-free clad coating with retention of high hardness and toughness
- Reduction in deleterious secondary carbides formation
- 2 mm thick coating has been developed
- Clads produced under pulsed-mode of processing showed relatively higher amount of unmelted WC particles in γ-Ni+Ni3B lamellar eutectic matrix (see figure) as compared to continuous-mode of processing
- Hardness as well as erosion resistance was found to be superior in case of pulsed-clad coating
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Microstructure of composite clad
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