A. V. Zorichev, G. T. Pashchenko, O. A. Parfenovskaya, V. M. Samoilenko, T. I. Golovneva
{"title":"Comparative Heat-Resistance Investigation of Protective Coatings","authors":"A. V. Zorichev, G. T. Pashchenko, O. A. Parfenovskaya, V. M. Samoilenko, T. I. Golovneva","doi":"10.1134/S0036029523120376","DOIUrl":null,"url":null,"abstract":"<p>Since modern gas turbine engines operate under changing temperature load conditions, one of the important characteristics of the protective coatings on turbine blades is their high resistance to the appearance and development of cracks under mechanical and thermal loads. The effective internal heat removal systems used to cool turbine blades lead to an increase in their thermal stress. Currently, the cracks induced by thermal fatigue are one of the common defects in the protective coatings on turbine blades. The heat resistance of the coatings at high temperatures is determined by the following three factors: the shape of the part onto which a coating is applied, the coating thickness, and the phase composition of the surface layers or the maximum aluminum content in the coating. Therefore, when a protective coating is chosen under specific operating conditions, it is important to know the influence of these factors on the heat resistance of the coating. In this work, we compare various coatings in terms of their resistance to cracking during cyclic temperature changes. The dependence of the heat resistance of the coatings on the method of their application and the phase-structural state is established. The revealed mechanism of thermal-fatigue crack formation and propagation as a function of the phase composition of the initial coating is especially valuable. The life of the protective coatings under cyclic temperature changes is shown to depend on the chemical composition of the coating and the method of its formation. The dependence of formation of thermal-fatigue cracks on samples with the coatings under study on the number of temperature change cycles is found.</p>","PeriodicalId":769,"journal":{"name":"Russian Metallurgy (Metally)","volume":null,"pages":null},"PeriodicalIF":0.4000,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Russian Metallurgy (Metally)","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1134/S0036029523120376","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract
Since modern gas turbine engines operate under changing temperature load conditions, one of the important characteristics of the protective coatings on turbine blades is their high resistance to the appearance and development of cracks under mechanical and thermal loads. The effective internal heat removal systems used to cool turbine blades lead to an increase in their thermal stress. Currently, the cracks induced by thermal fatigue are one of the common defects in the protective coatings on turbine blades. The heat resistance of the coatings at high temperatures is determined by the following three factors: the shape of the part onto which a coating is applied, the coating thickness, and the phase composition of the surface layers or the maximum aluminum content in the coating. Therefore, when a protective coating is chosen under specific operating conditions, it is important to know the influence of these factors on the heat resistance of the coating. In this work, we compare various coatings in terms of their resistance to cracking during cyclic temperature changes. The dependence of the heat resistance of the coatings on the method of their application and the phase-structural state is established. The revealed mechanism of thermal-fatigue crack formation and propagation as a function of the phase composition of the initial coating is especially valuable. The life of the protective coatings under cyclic temperature changes is shown to depend on the chemical composition of the coating and the method of its formation. The dependence of formation of thermal-fatigue cracks on samples with the coatings under study on the number of temperature change cycles is found.
期刊介绍:
Russian Metallurgy (Metally) publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.