IMPROVING THE PROPERTIES OF NICKEL-BASED SUPERALLOYS OF DIRECTED CRYSTALLIZATION BY OPTIMIZING THE CHEMICAL COMPOSITION

Purpose. It consists in establishing the influence of chemical composition on type, and morphology primary carbides nickel-based superalloy, which allows to increase operational properties parts through structure carbide component.
 Research methods. Process modeling was carried out using CALPHAD method. The initial data were compositions model alloys with different concentrations carbide-forming elements. result calculation released corresponding systems. experimental values processed by statistical methods obtain correlation dependencies “parameter-property” type establish mathematical equations regression models that optimally describe these dependencies.
 Results. regularities effect metal MC have been established. is shown depending elements introduced system, basis can change, causes a change their shape an crack resistance material. obtained dependences are closely correlated metallographic studies this class.
 Scientific novelty. variation multicomponent system Ni-Cr-Co-Al-W-Re-Ta-Mo-Nb-C This makes it possible carbides, morphology, thereby improving mechanical material, especially fatigue heat-resistant characteristics.
 Practical value. An effective solution for structural-phase state superalloys optimizing proposed, made improve established be used optimization industrial cast development new compositions.