Abstract
The weld metal microstructures of five commercial nickel base alloys (HASTELLOYS* C-4, C-22, and C-276, and INCONELS* 625 and 718) have been examined by electron probe microanalysis and analytical electron microscopy. It has been found that solidification terminates in many of these alloys with the formation of a constituent containing a topologically-close-packed (TCP) intermetallic phase(i.e., σ, P, Laves). Electron microprobe examination of gas-tungsten-arc welds revealed a solidification segregation pattern of Ni depletion and solute enrichment in interdendritic volumes. New PHACOMP calculations performed on these segregation profiles revealed a pattern of increasingM d (metal-d levels) in traversing from a dendrite core to an adjacent interdendritic volume. In alloys forming a terminal solidification TCP constituent, the calculatedM d values in interdendritic regions were greater than the criticalM d values for formation ofσ as stated by Morinagaet al. Implications of the correlation between TCP phase formation andM d in the prediction of weld metal solidification microstructure, prediction of potential hot-cracking behavior, and applications in future alloy design endeavors are discussed.
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Cieslak, M.J., Knorovsky, G.A., Headley, T.J. et al. The use of new PHACOMP in understanding the solidification microstructure of nickel base alloy weld metal. Metall Trans A 17, 2107–2116 (1986). https://doi.org/10.1007/BF02645909
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DOI: https://doi.org/10.1007/BF02645909