Abstract
Inconel 713C is a nickel-based superalloy usually considered as a material of poor weldability due to its susceptibility to hot cracking in the heat-affected zones. Cold spray, a solid-state deposition technology that does not involve melting, can be proposed as a methodology to deposit Inconel 713C for surface enhancement of other target components. In this study, Inconel 713C coating was deposited on Inconel 718 substrate with a high-pressure cold spray system. The coating was characterized in terms of microstructure, hardness, and wear properties. The cold-sprayed Inconel 713C coating has a low porosity level and refined grain structures. Microhardness of the Inconel 713C coating was much higher than the Inconel 718 substrate. The sliding wear tests showed that the wear resistance of the cold-sprayed Inconel 713C coating is three times higher than the Inconel 718 substrate, making the coating a suitable protective layer. The main wear mechanisms of the coating include oxidation, tribo-film formation, and adhesive wear.
Highlights
Inconel 713C is a nickel-based superalloy that possesses excellent creep resistance and oxidation resistance at high temperatures; it is usually applied in jet engines, industrial turbines, and dies for casting or forging
With the rapid formation of oxide films on the surface at high temperatures, the components fabricated with Inconel 713C possess good wear resistance for high-temperature applications [1]
Because there is no melting or solidification involved in cold spray, deposition can be achieved much faster compared with other additive manufacturing technologies
Summary
Inconel 713C is a nickel-based superalloy that possesses excellent creep resistance and oxidation resistance at high temperatures; it is usually applied in jet engines, industrial turbines, and dies for casting or forging. Upon impact of particles on a substrate surface, the thermal softening effect outweighs the strain-hardening effect due to the transformation of kinetic energy to thermal energy. Because there is no melting or solidification involved in cold spray, deposition can be achieved much faster compared with other additive manufacturing technologies. Compared with thermal spray, the particle temperature in the cold spray process remains much lower than the melting temperature, so there is little oxidation or phase transformation in either coating or substrate [6]. All this makes cold spray promising for repair and surface enhancement in various industries
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