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Experimental Investigation on Metallurgy of High Vacuum Electron Beam Welded Ni Base Alloy Inconel 718
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The excellent weld quality of Inconel 718, among the class of Ni, Cr precipitation hardenable alloys is well recognised. Electron Beam Welding (EBW) (especially the high vacuum) is the most preferred technique, to impart the optimum level of properties, as is demanded for many of its critical applications in the fields of Nuclear power and Aerospace. This paper examines in detail the microstructure of weldments obtained in different material conditions i.e. with parent material in solution treated condition, in double aged condition and the ones weld in solution treated condition and administered varied post weld heat treatments, along with compositional analysis i.e. EDAX, and the effect of weld heat on grain structure. This paper also highlights and contrasts evaluation of weld properties of Inconel 718 by Electron Beam Welding in comparison with laser beam welding (LBW).
Keywords
Microstructure, Composition Analysis, Weld Heat, Grain Morphology, Grain Boundary Segregation.
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