Influence of Aluminide Layer on the Dynamics of the Development of Fatigue Damage in Ni-Cr-Co Alloy

Dominik Kukla; Ryszard Sitek

doi:10.4028/www.scientific.net/SSP.240.101

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Influence of Aluminide Layer on the Dynamics of the Development of Fatigue Damage in Ni-Cr-Co Alloy

Abstract:

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.

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Periodical:

Solid State Phenomena (Volume 240)

Pages:

101-107

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.240.101

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Online since:

August 2015

Authors:

Dominik Kukla*, Ryszard Sitek

Keywords:

Alumina Layer, Fatigue Damage, Super Nickel Alloy

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