ASSESSMENT OF THE STRUCTURE AND PROPERTIES OF THE HEAT-RESISTANT NICKEL ALLOY ZHS32-VI AS A MATERIAL FOR THE MANUFACTURING OF GAS TURBINE ENGINE BLADES

Purpose. To study the macro- and microstructural state of pilot heat-resistant alloy ZhS32-VI casts for the production of critical gas turbine engine components and to evaluate their mechanical properties and heat resistance. Research methods. Structural stability parameters were assessed using the well-known PHACOMP and New PHACOMP calculation methods. Macro- and microstructural analysis and phase composition studies were performed using optical metallography. Mechanical properties at room temperature were determined in accordance with ISO 6892-84 and ST SEV 471-88, while creep-rupture strength tests were conducted in accordance with DSTU ISO 204:2019. Results. The structure and properties of ZhS32-VI alloy specimens produced in a ULMAC FM 1-2-100 vacuum furnace using equiaxed crystallization were studied. The microstructure of the specimens before heat treatment corresponded to the as-cast state of the alloy, and after heat treatment, it met the technical specifications and conformed to the approved microstructure scale. Mechanical properties and heat resistance meet the requirements of technical documentation for critical heat-resistant castings. Scientific novelty. New data on the structure and phase composition of the heat-resistant alloy ZhS32-VI alloy from pilot heats were obtained. Calculation and analytical evaluation method confirmed a high level of structural stability. Practical value. The obtained results provide an opportunity to expand the application of the ZhS32-VI heat-resistant nickel alloy for the production of critical castings.