The microalloying effects on the solidification structure of Inconel 7 18 were examined by means of differential thermal analysis, optical microscopy and scanning electron microscopy, in order to elucidate the mechanism of the macrosegregation in the alloy. The solidification and precipitation sequence of Inconel 718 was found to be characterized by the following five reactions; (1) the proeutectic y reaction at about 1360°C (2) the y+MC eutectic reaction at about 1290°C (3) the y+Laves phase eutectic reaction at about 1160°C (4) the 6 phase precipitation reaction in the y phase at about 1145"C, and (5) the y ' and y " precipitation reaction in the y phase at about 1000°C. By combining this result with the analysis of the solute distributions in the ESR ingots, the mechanism for the occurrence of the freckles was proposed in Inconel7 18.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.