Scientific Production Association Technopark of Aviation Technologies, Ufa, Russia

I. V. Kandarov, Director, Candidate of Technical Sciences, e-mail: tpat@tp-at.ru
V. M. Piksaev, Head of the Casting Technology Department, Candidate of Technical Sciences, e-mail: vasiliypiksaev@mail.ru

Kazan (Volga Region) Federal University, Kazan, Russia
D. L. Pankratov, Head of the Mechanical Engineering Department, Doctor of Technical Sciences, e-mail: pankratovdl@gmail.com
V. G. Shibakov, Mechanical Engineering Department, Doctor of Technical Sciences, e-mail: vladshib50@gmail.com

Heat-resistant alloys are widely used in hot sections of aviation engines and ground-mounted power gas turbines due to their strength at higher temperatures and high hot corrosion resistance. To increase life of the gas turbine, there are various technological methods; one of them is to influence the structure and properties. The article describes the results of using a combined technological system to achieve a fine-grain structure of large blades (up to 900 mm) from heat-resistant nickel alloy IN792-5А. It has been shown that the best result will be achieved by harmonizing technological effects, entailing a positive synergetic effect. The article presents the results of applying integrated heat treatment, and surface modification. The authors selected process modes to minimize γ'-phase in the body of the cast workpiece. The object under study was the cast workpiece of the operating blade of stage 4. The studies were conducted to develop a technological system for manufacturing large gas turbine blades, potentially ensuring a macro- and microstructure specified by customers and the required operational properties; to study a technological system as an object of control to comply with customers’ requirements; to determine reasonable parameters of processes as part of the technological system under study. To achieve the objectives, the authors solved the following issues: finding the dependence between the effect of casting process parameters and the macrostructure and studying the effect of applying a modifier on the macrostructure.

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