STRUCTURE AND PROPERTIES OF THE WORKING BLADES OF AIRCRAFT GAS TURBINE ENGINES MADE OF HEAT-RESISTANT NICKEL ALLOY ZhS32-VI
DOI:
https://doi.org/10.15407/plit2026.03.034Keywords:
working blade, aviation gas turbine engine, hot isostatic pressing, microstructure, heat treatment, structural uniformity, strength, ductility, long-term strengthAbstract
The structures and properties of the working blades of the first stage of aircraft gas turbine engines (GTD), cast from the heat-resistant nickel alloy ZhS32-VI by the method of high-speed directional crystallization after hot isostatic pressing (HIP) and various heat treatment regimes. HIP at a temperature of 1250 ℃ and a pressure of 170 MPa contributes to the improvement of the quality of castings by stabilizing the structure and properties due to the reduction of microporosity during the "healing" of pores. The size of individual micropores detected after HIP is approximately 32 times smaller compared to the pores observed in the blades before the HIP operation. As a result of plastic deformation initiated by HIP, the formation of a "raft" structure in the form of zonal areas concentrated in the places of "healing" of pores, as well as the release of coagulated phase particles, which together with lamellar (eutectic) carbides have the appearance of a framework. Heat treatment according to the standard regime (1270 ℃, 1h.15min) after HIP promotes recrystallization of the strengthening phase, increases the structural homogeneity of the alloy and causes relaxation of stresses induced in the HIP process, which positively affects the physical and mechanical properties. Four-hour heat treatment at a temperature of 1050 ℃ immediately after the HIP operation does not eliminate structural heterogeneity, which is characterized by the presence of liquation zones, as well as areas characteristic of "raft" - structures formed during the gas-setting process. Conducting intermediate high-temperature heating (homogenization) after HIP at a temperature of 1270℃ (1h.15min) with subsequent heating at a temperature of 1050℃ for 4 hours contributes to obtaining a more homogeneous structure of the ZhS32-VI alloy, which positively affects the mechanical and heat-resistant properties.
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