Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk

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Ryszard Sitek

Warsaw University of Technology (PL)

Ostatnie publikacje
1.  Kukla D., Kopeć M., Sitek R., Olejnik A., Kachel S., Kiszkowiak Ł., A novel method for high temperature fatigue testing of nickel superalloy turbine blades with additional NDT diagnostics, Materials, ISSN: 1996-1944, DOI: 10.3390/ma14061392, Vol.14, No.6, pp.1392-1-17, 2021

Streszczenie:
In this paper, a novel method for high temperature fatigue strength assessment of nickel superalloy turbine blades after operation at different times (303 and 473 h) was presented. The studies included destructive testing (fatigue testing at temperature 950 °C under cyclic bending load), non-destructive testing (Fluorescent Penetrant Inspection and Eddy Current method), and finite element modelling. High temperature fatigue tests were performed within load range from 5200 to 6600 N using a special self-designed blade grip attached to the conventional testing machine. The experimental results were compared with the finite element model generated from the ANSYS software. It was found that failure of turbine blades occurred in the area with the highest stress concertation, which was accurately predicted by the finite element (FE) model.

Słowa kluczowe:
nickel superalloys, high temperature fatigue, finite element (FE) modelling, eddy current

Afiliacje autorów:
Kukla D. - IPPT PAN
Kopeć M. - IPPT PAN
Sitek R. - Warsaw University of Technology (PL)
Olejnik A. - inna afiliacja
Kachel S. - inna afiliacja
Kiszkowiak Ł. - inna afiliacja
140p.
2.  Kukla D., Sitek R., Influence of aluminide layer on the dynamics of the development of fatigue damage in Ni-Cr-Co alloy, SOLID STATE PHENOMENA, ISSN: 1012-0394, DOI: 10.4028/www.scientific.net/SSP.240.101, Vol.240, pp.101-107, 2016

Streszczenie:
Thermomechanical conditions in which the elements of modern aircraft engines work, require the use of protective coatings. The coatings increase the creep strength and also the local thermal stress in the near-surface areas due to the differing thermal expansion of particular material layers. For this reason it is necessary to develop a method for evaluating the operating properties of nickel superalloys with the aluminide layer, taking into consideration the surface processes related to the thermo-mechanical fatigue, taking place during the operation. In the presented work the assessment of the influence of the aluminium-coated layer, deposited on the nickel alloy specimens in the chemical deposition process (CVD) on the changes of the damage parameter in cyclic load conditions was carried out. The damage parameter was defined as a total strain in consecutive load cycles. The dynamics of damage development was analysed for two specimen lots (4 with the layer and 4 without it) displaying axial symmetry with a narrowing in the measured section. The results obtained were correlated with the results of fractography studies using SEM. The results obtained were used for the determination of the relationship between the damage parameter being the sum of the average strain and the strain amplitude, and the number of cycles, until the specimen is destroyed.

Słowa kluczowe:
Alumina Layer, Fatigue Damage, Super Nickel Alloy

Afiliacje autorów:
Kukla D. - IPPT PAN
Sitek R. - Warsaw University of Technology (PL)
3.  Sitek R., Kukla D., Kobayashi A., Kurzydłowski K.J., Influence of High-Temperature Aluminizing on the Fatigue and Corrosion Resistanceo f Nickel Alloy Inconel 740, Frontier of Applied Plasma Technology, ISSN: 1883-5589, Vol.7, No.1, pp.21-24, 2014

Streszczenie:
The paper presents the results of studies on the structure and properties of the AlNi type diffusion layers fabricated on the IN 740 nickel alloy by chemical vapor deposition using aluminium chloride (AlCl3), introduced into a hydrogen atmosphere. The layers were examined by light microscopy and scanning electron microscopy. Their chemical composition was examined by EDS, and the phase composition - using a Bruker D8 X-ray diffractometer with CuKa radiation. Fatigue tests were carried out in Inconel 740 sample, in the initial state and covered with the diffusion intermetallic AlNi layers. The strength under dynamic load was examined using a MTS 858 testing machine using symmetric load cycles repeated at a frequency of 20 Hz. The stress amplitude was 550 MPa. Corrosion resistance tests were performed employing potentiodynamic methods, in 0.1M Na2SO4 solution, at ambient temperature. It is shown that the layers improve the fatigue resistance and corrosion resistance of the Inconel 740 substrate.

Słowa kluczowe:
Inconel 740, CVD, Aluminide layer, High-cycle fatigue, corrosion resistance

Afiliacje autorów:
Sitek R. - Warsaw University of Technology (PL)
Kukla D. - IPPT PAN
Kobayashi A. - University of Technology Malaysia KL (MY)
Kurzydłowski K.J. - Warsaw University of Technology (PL)

Abstrakty konferencyjne
1.  Kukla D., Grzywna P., Sitek R., Szwed M., Fatigue damage development in nickel-based superalloy with the alumina layer, DAS 30, 30th Danubia-Adria-Symposium on Advances in Experimental Mechanics, 2013-09-25/09-28, Primosten (HR), pp.308-309, 2013
2.  Sitek R., Kukla D., Kurzydłowski K.J., Structure and Properties of the CrN+QlrNi3 Layer Produced on Inconel 740 by Pulse Plasma Ion Nitriding at a Frequency of 10kHz, 20th Annual Meeting of IAPS International Workshop in Malaysia, 6th International Workshop on Plasma Application and Hybrid Functionally Materials, 2013-03-08/03-11, Kuala Lumpur (MY), Vol.22, pp.37-38, 2013

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