I. N. Tsareva, O. B. Berdnik , S. V. Kirikov

STUDY OF FATIGUE PROCESSES IN THE MATERIAL COMPRESSOR BLADES OF A GAS TURBINE ENGINE AFTER LONG-LAST OPERATING

The paper studies the microstructure and mechanical properties of the material of an axial compressor incorporated in a gas pumping unit after long-term operation. It is known that, during long-term operation, fatigue damage accumulates in the material. This is due to the simultaneous impact of vibration and mechanical loads on the material of the blades, as well as the influence of air flow at elevated temperatures. In order to determine the stage of fatigue, the microstructure and mechanical properties of the material (steel 20Kh13) were studied. Such changes as the formation of microporosity, the disintegration of sub-grained blocks of the α-Fe phase, and the coagulation of the carbide phase are found in the material structure. The accumulation of fatigue damages is most pronounced in the material of the 5th stage blades and it is manifested in the increasing microhardness of the airfoil surface and decreased tensile strength near the blade root.

Acknowledgment: The work was carried out within the framework of the state assignment for the IAP RAS for conducting basic research in 2013–2020, theme No. 0035-2014-0401 (State registration number 01201458049).

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