Direct metal laser sintered (DMLS) process to develop Inconel 718 alloy for turbine engine components

Nickel based superalloys are difficult to manufacture in conventional production process. Laser based fusion bed method is adopted to develop metal. Direct metal laser sintering (DMLS) is one of the best to produce difficult to produce metal component. The developed alloy was planned to perform heat treatment process and the metallurgical properties are enriched. To investigate initial effects of microstructure, the material as deposit and treated material under are studied in detail. To compare the result of DMLS and commercial alloy were also heat treated at same condition. In this research, corrosion behavior of DMLS alloy and commercially available Inconel 718 are tested with 1.0 M H2SO4 solution at room temperature. The electrochemical results of DMLS and commercial alloy are compared for corrosion rate. It was found that the DMLS sample give good corrosion resistance than the commercial IN718 alloy due to the precipitation γ” is high. The segregation of iron element is more in commercial alloy and nickel element is high in DMLS alloy was found in the EDS analysis.