A crack-free bi-metallic structure developed by researchers using a technique called laser-based powder bed fusion (PBF-LB/M) additive manufacturing can help in reducing the overall use of expensive superalloys thereby reducing the import dependency.
Stainless steels and nickel-based super alloys are widely used in aerospace, nuclear, as well as thermal power plants.
Certain regions of a gas turbine may experience temperatures as high as 2000°C, while adjacent sections are exposed to lower temperatures during service conditions.
Combining stainless steel (good toughness and corrosion resistance) with nickel-based superalloys (excellent high-temperature strength and creep resistance) in a single component is technologically attractive.
Conventional welding of Stainless steel (SS316L) and Inconel superalloy (IN718) is challenging due to differences in chemical composition, melting temperatures, and thermal expansion coefficients.
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