PREDICTION THERMO-PHYSICAL CHARACTERISTICS HEAT-RESISTANT NICKEL ALLOYS DIRECTIONAL CRYSTALLIZATION

Abstract

The paper presents a comparative analysis of the practical and calculated values of the thermophysical properties of heat-resistant nickel alloys of directional solidification. Using an empirical approach, new ratios of the elements K\uf067\uf0a2 and K\uf067 have been obtained for the first time, which take into account the combined effect of alloying elements on the temperature of multicomponent compositions of cast heat-resistant alloys. The calculated values of the critical temperatures for the Ni-6Al-9Co-8W-4Re-4Ta-1.5Nb-1Mo0.15C system are in good agreement with the experimental ones. The dependence of the K\uf067 ratio on the alloying system; the influence of alloying on the liquidus temperature of the alloys is studied. The ratios of the content of alloying elements and regression models that can be used to predict the width of the crystallization temperature range and the optimal homogenization temperature for a particular alloy are presented.