Influence of crystallization parameters on perfection of single crystals of heat resistant nickel alloy

A consideration is given to the dependence of structure morphology and variable section monocrystals of nickel base alloy, mass.% the degree of perfection of cylindrical and (Ni-9.9Co-8.4W-5.5Al-4.7Ta-4.0Cr-3.3Re-1.2Nb-0.5Mo-0.15C) on crystallization rates (5, 10, 30, 40, 50 mm x min-1) and crystallographic orientation of a crystal-melt interface. Crystallization parameters which provide formation of disperse dendritic structure with low amount of crystal defects along the whole length of monocrystalline castings have been determined. Experimental and calculated values are compared for the first order dendritic parameter depending on growth rate at a given temperature gradient at crystallization front. 9 refs., 5 figs., 3 tabs