Viability of Turbine Blade Material with a Long Service Life
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L SCIENCES. METALLURGY
Viability of Turbine Blade Material with a Long Service Life O. B. Berdnika, *, I. N. Tsarevaa, and M. K. Chegurovb aInstitute
of Engineering Problems, Russian Academy of Sciences, Branch of Institute of Applied Physics, Nizhny Novgorod, 603024 Russia b National Research Alekseev State University of Nizhny Novgorod, Nizhny Novgorod, 603950 Russia *e-mail: [email protected] Received October 23, 2018; revised November 12, 2018; accepted November 19, 2018
Abstract—This article deals with structural features and characteristic changes that affect the mechanical characteristics after different service life in real conditions using the example of the blades of the fourth stage of turbine GTE-45-3 with an operating time of 13000 to 100000 h. To study the change in the state of the material under different operating conditions, determine the degree of influence of heat treatment on the regeneration of the microstructure, and restore the mechanical characteristics of the alloy after different periods of operation, nonstandard methods were used: relaxation tests on miniature samples to determine the physical yield strength and microplasticity limit and quantitative evaluation of the plasticity coefficient of the material from experimental values of hardness, which allow us to identify the changes occurring in the microvolumes of the material and predict the performance of the product as a whole. Keywords: turbine blades, heat-resistant nickel alloy, heat treatment, microstructure, carbide phase, mechanical characteristics, physical yield strength, microplasticity limit, hardness, plasticity coefficient DOI: 10.1134/S2075113320060039
INTRODUCTION Under the assumption of a large number of operating turbine plants, scheduled repair works are the most effective variant of maintenance of power plants in the operating state. The main purpose of these works is to provide a firm service life of both individual details (as exemplified by turbine blades) and the whole product at relatively low expenses. At present, the problem of repair and extension of the service life of the blade system of power plants is relevant [1, 2]. The operating time of blades should amount to 50000 h during operation under standard conditions. In practice, blades operate much longer than this period. In view of the fact that repair works are usually carried out at the same enterprises where a particular type of power plants is produced, these organizations spend resources on the development and implementation of resource-saving technologies in order to provide competitive ability of their products. The stage of development and implementation of new technologies is usually initiated only after depletion of the overhaul operating time by the product, which results in unreasonable idle time of power equipment. Therefore, a principle of early development of new process engineering solutions aimed at the extension of service life and reliability of heavy-duty parts and units of equipment is used at leading enterprises. Such an approach requir
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