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Nickel based superalloys are widely used in industry where high temperature strength and corrosion resistance are required, but these alloys are very complex in nature. They are typically made up of 10 to 15 different elemental additions to the nickel base. Additions of Cr, Co, W, Ta, Al, Ti, Re, Mo, and in some alloys Ru are all common. Each of these additions can affect the as-cast microstructure due to differences in elemental segregation. A better understanding of the effects of the additions on the segregation of all of the elements in the alloy can help make improvements in processing of current alloys and development of new alloys. Therefore, the effect of several common alloying additions on the resulting solidification segregation and phase transformation temperatures were evaluated. In general, an increase in the degree of elemental segregation was observed with increasing additions of each of the elements listed above, except Co and Mo. Increased levels of Co and Mo resulted in reductions in the segregation of most of the elements in the alloy.
Caldwell et al. (Thu,) studied this question.