Abstract
Nickel-based super alloys comprise of up to ten alloying elements inclusive of both heavy refractive and lightweight elements. These super alloys find application in corrosive or oxidizing environment, high temperature, and stresses. They possess high fracture toughness, tensile and yield strength. There is a demand for high quality welded joints of Nickel-based super alloys in gas turbines of power generation and aerospace. Manufacturers around the world are trying to enhance the properties with befitting process parameters and approaches. In this paper, chemical compositions, microstructures, welding and fracture studies of nickel-based super alloys with special reference to Inconel 718 was reviewed. Dissimilar metal welding of Inconel 718 to other alloys were also reviewed.
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