Increased temperature impact on durability of gas turbine blades

Błachnio, Józef; Bogdan, Mariusz; Zasada, D.

doi:10.17531/ein.2017.1.7

Cited by 17 publications

(10 citation statements)

References 10 publications

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“…Based on the appearance of an operated blade and the results of metallographic tests, it can be concluded that in a partially fit blade, there was a significant increase of the grain size and phase γ particles. This growth was particularly large in an unfit-overheated blade, which, due to lack of alloy strength, broke off during rotation [12,14]. Such a conclusion results from the greater intensity in temperature equalization of operated blades after a thermal pulse [7,8,17].…”

Section: Discussion Of the Test Resultsmentioning

confidence: 99%

“…The relative volume of phase γ' after standard alloy heat treatment is 31 ÷ A gas turbine blade destruction process usually starts on the edge of attack in the form of overheating or cracking [9]. The blade material is exposed to direct, aggressive impact of flue gases, which leads to adverse microstructural changes [10][11][12], putting the blade out of operation (use). An illuminated blade surface may be viewed with a light-sensitive detector thanks to a secondary light source reflected off its surface.…”

Section: Characteristics Of the Object And Description Of Materials Testsmentioning

confidence: 99%

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Assessing the Condition of Gas Turbine Rotor Blades with the Optoelectronic and Thermographic Methods

Bogdan

Błachnio

Kułaszka

et al. 2019

Metals

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Gas turbines and their blades in particular might be damaged in the course of the aviation turbojet engine operation process. The degradation process of the blade microstructure is most evident from the change in the colour of its surface. This is assessed using the optoelectronic method. The article presents the concept of non-destructive methods, which are used to assess the degree of degradation of the alloy of a gas turbine blade. The proposed optoelectronic method is the basic method for the preliminary determination of color changes in the surface. Appropriate videoscopes or video-analyzers, capable of recording a test object in various electromagnetic wave ranges (infrared radiation, visible range), are used for this purpose. These preliminary results of the diagnosis make it possible to infer further studies of the blade. For accurate investigation of the state of the alloy microstructure, a non-destructive thermographic method (xenon flash pulsed thermography) was used. The results of studies of the degradation of the microstructure with the use of non-destructive methods were verified through the use of metallographic investigations. Appropriate metallographic specimens were created in order to recognize phase γ′ degradation (i.e., the phase strengthening the blade alloy). The results of the presented research allowed for an in-depth assessment of the degree of microstructure degradation of operated blades.

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Section: Discussion Of the Test Resultsmentioning

confidence: 99%

Section: Characteristics Of the Object And Description Of Materials Testsmentioning

confidence: 99%

Assessing the Condition of Gas Turbine Rotor Blades with the Optoelectronic and Thermographic Methods

Bogdan

Błachnio

Kułaszka

et al. 2019

Metals

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“…The gas turbine vane (blade) destruction process starts with the deterioration of the aluminium coating (presented in the surface images in the form of colour scheme changes). The latter part of the paper will demonstrate the relation between the surface colour changes and its technical condition defined as the material criterion -material overheating (condition of vane coating, material -phase γ') [4,23,24]. The method of procedure when developing the concept of computer-assisted assessment of the technical condition of used gas turbine vanes included several stages related to the recording of image data, selection of suitable colour representation (colour space), approach to notions related to colour analysis and metallographic testing.…”

Section: Diagnosing and Forecasting The Failure Of Operated Vanesmentioning

confidence: 99%

“…3 from figure 8c, its share increases in vanes no. 4,5,6). This condition of the coating is classified as partially fit for further use.…”

Section: Diagnosing and Forecasting The Failure Of Operated Vanesmentioning

confidence: 99%

“…6 is characterised by dispersive secondary separation of the phase γ' , resulting from the impact of high temperature exhaust fumes. The morphology of phase γ' indicates that after exceeding the critical temperature, the alloy is overheated, and the turbine vane cannot be deemed as fit for further use [4,23,24]. Figure 10a presents the line that represents the averaged colour profile (considering the cutting thickness, cuts parallel to the leading edge; the dotted lines mark cuts that are perpendicular to the leading edge).…”

Section: Diagnosing and Forecasting The Failure Of Operated Vanesmentioning

confidence: 99%

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Concept of Computer-Aided Assessment of the Technical Condition of Operated Gas Turbine Vanes

Bogdan

Derlatka

Błachnio

2018

Polish Maritime Research

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The article presents a multi-stage algorithm for automatic (without any human, user – diagnostician intervention) detection of vanes-blades (technical objects) and their surfaces on a digital image, combined with color analysis, aimed at determining the technical condition of the tested turbine elements. The images recorded with the use of a camera, containing previously dismantled from the turbine operated stator vanes, were used as the exemplary analysis material. The paper presents the algorithm for the detection of the vanes’ airfoil surfaces with the impact of the applied techniques and methods of image processing and analysis on the final result (software localization of the vane’s trailing and leading edge), Then, the obtained image data, including the structural changes of both the vane’s coating and material (metallographic testing) were correlated with the surface colour scheme (colour segmentation based on the YCbrCr colour space model). Thanks to this approach, areas on the surface of the blade were distinguished, characteristic for proper, overheated and transient condition.

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Contemporary Materials and Their Application in the Construction of Special Engineering High-Temperature Objects

Belyakov,

Markov,

Kravchenko

et al. 2023

Refract Ind Ceram

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Increased temperature impact on durability of gas turbine blades

Cited by 17 publications

References 10 publications

Assessing the Condition of Gas Turbine Rotor Blades with the Optoelectronic and Thermographic Methods

Assessing the Condition of Gas Turbine Rotor Blades with the Optoelectronic and Thermographic Methods

Concept of Computer-Aided Assessment of the Technical Condition of Operated Gas Turbine Vanes

Contemporary Materials and Their Application in the Construction of Special Engineering High-Temperature Objects

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