ANALYTICAL CALCULATION OF QUALITY INDICATORS ЖС3ДК-ВІ FOUNDRY HEAT-RESISTANT NICKEL ALLOY

Abstract

Purpose. Carrying out analytical calculations of the most important parameters that determine the structural and phase stability and workability of the cast heat-resistant nickel alloy ЖС3ДК-ВІ, using known calculation and analytical methods, to assess its general suitability for wide application of modification with various complexes.Research methods. According to the PHACOMP and New PHACOMP calculation methods, the parameters of structural stability were calculated based on the chemical composition of γ-solid solutions: the total number of elec-tron vacancies in the γ-solid solution and the total number of valence electrons in the γ-solid solution dγ, tak-ing into account the values of the parameter of the tendency of the alloy to form topologically densely packed (TDP) phases. The balance of the chemical composition of the alloy was assessed by the ΔE method based on the value of the imbalance parameter of its alloying system, using computer modeling of thermodynamic processes by the CALPHAD method in the program (JMatPro). In accordance with the complex calculation and analytical methodology (ССAM) developed at NU “Zaporizhzhia Polytechnic”, temperature parameters, short-term strength limit values and long-term strength values at different temperatures for the ЖС3ДК-ВІ alloy at different levels of alloying were determined using regression mathematical models obtained on the basis of mathematical processing of known experimental data.Scientific novelty. A complex of computational and analytical studies was carried out and the most important parameters characterizing the structural and phase stability and workability of the cast heat-resistant nickel alloy ZhS3DK-VI were determined.According to the parameters of the imbalance of the alloying system ΔE and the total number of valence elec-trons in the dС, alloy, the ЖС3ДК-ВІ alloy is enought balanced near the average level of element content.It was established that in the entire range of Cr, W, and Mo alloying, the values of the parameters of the PTDP, and dγ decrease slightly monotonically, which indicates a high level of structural stability of the ЖС3ДК-ВІ alloy.The obtained calculation data indicate that the ЖС3ДК-ВІ alloy is clearly not designed for operation at tem-peratures approaching 1000 ºС for 1000 hours.Practical value. The obtained results indicate the sufficient stability of the ЖС3ДК-ВІ alloy and its general suitability for wide application of modification with various complexes to improve the level of physical-mechanical and operational properties.