Tests of Damage to Inconel 718 Alloy Used in Aviation

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Inconel 718 alloy was tested. A new type of specimens of variable cross-sectional area measuring part was used for the tests. This provided a continuous distribution of plastic strain in that part of the sample. The proposed method enables to replace a series of specimens by one specimen. The degradation of the material was obtained by static tensile test and the creep test. The permanent deformation that varies along the specimen axis allows for an analysis of damage induced by a plastic deformation. The degradation of the alloy corresponds with the changes of acoustics properties of the material - attenuation of ultrasonic waves. It allows to detennine the degree of damage to the material using a non-invasive - ultrasonic method. Using the damage parameter proposed by Johnson allows to obtain correlation between the non-destructive results and a damage degree of the material. The presented testing method delivers information about changes in the material structure caused by permanent deformation.

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  • [1] Kachanov L. M. 1986 „Introduction to Continuum Damage Mechanics” Martinus Nijhoff The Netherlands.

  • [2] Holler P. & Dobmann G. 1989 NDT-Techniques for monitoring material degradation Mat. Res. Soc. Symp. Proc. 142 pp. 105-118.

  • [3] 2013 „Materials Degradation and Detection (MD2): Deep Dive Final Report” U.S. Department of Energy.

  • [4] Deputat J.1997 „Nieniszczące metody badania własności materiałów” [“Non-destructive methods for testing material properties”] Biuro Gamma [Gamma Office] Warsaw.

  • [5] Pawłowski Z. 1998 „Badania nieniszczące[“Non-destructive tests”] Polish Society of Mechanical Engineers and Technicians Ośrodek Doskonalenia Kadr SIMP w Warszawie [SIMP Human Resources Traning Centre in Warsaw].

  • [6] Socha G. Madejski B. Krysztofik J. i Czarnewicz S. 2014 „Sposób badania uszkodzenia struktury materiału wywołanego deformacją trwałą próbki poddanej rozciąganiu i próbka do badania uszkodzenia struktury materiału’’ [“Test method of the material structure damage caused by permanent deformation of a specimen subjected to tension and a sample for testing the material structure damage”] Application to the Patent Office of the Republic of Poland No. P-409294. of 27.08.2014.

  • [7] Johnson G. R.1980 „Materials characterization for computations involving severe dynamic loading” Proc. Army Symp. of Solid Mechanics Cape Cod Mass pp. 62-67.

  • [8] Krysztofik J. Socha G. and Kukla D. 2015 „Ocena stopnia uszkodzenia stopu Inconel 718 z zastosowaniem prądów wirowych’’ [“Assessment of Inconel 718 alloy damage degree with the use of eddy currents”] Przegląd Spawalnictwa [Welding Review] 87(12) pp. 24-26.

  • [9] Krysztofik J. Malicki M. Madejski B. Czarnewicz S. Socha G. 2015 „Wczesne wykrywanie uszkodzeń superstopów na bazie niklu metodami nieniszczącymi” [“Early detection of damage to the nickel-based alloys using nondestructive methods”] Institute of Aviation Warsaw (unpublished report)

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