Název: LOW CYCLE FATIGUE BEHAVIOR AND FATIGUE CRACK INITIATION IN MAR-M247 AT 700 °C
Autoři: Šulák, Ivo ; Obrtlík, Karel ; Hrbáček, K.
Typ dokumentu: Příspěvky z konference
Konference/Akce: METAL 2017: International Conference on Metallurgy and Materials /26./, Brno (CZ), 20170524
Rok: 2018
Jazyk: eng
Abstrakt: The second generation nickel-based superalloy MAR-M247 offers a satisfying combination of fatigue and creep properties and oxidation and corrosion resistance that are required for application at elevated temperatures in hostile environments. The microstructure consists mainly of the face centred cubic γ matrix and ordered γ´ strengthening precipitates (L12 crystal structure). The present work focuses on low cycle fatigue (LCF) behaviour of polycrystalline nickel-based superalloy MAR-M247 at high temperature. LCF tests were conducted on cylindrical specimens in a symmetrical push-pull cycle under strain control with constant total strain amplitude and strain rate at 700 °C in ambient air. Cyclic stress-strain curves and fatigue life curves in the representation of plastic strain amplitude vs. stress amplitude and stress amplitude vs. the number of cycles to failure, respectively, were plotted and compared with data obtained on Inconel 713LC. Special attention was paid to the investigation of crack initiation in MAR-M247 during low cycle fatigue. Crack initiation sites were studied by means of scanning electron microscopy (SEM) in dual beam microscope TESCAN LYRA 3 XMU FESEM equipped with focus ion beam (FIB). Specimens’ surface observations revealed the formation of pronounced surface relief indicating localisation of plastic deformation. Observations in transmission electron microscope (TEM) confirmed localisation of cyclic plastic deformation in persistent slip bands along {111} slip planes. Fractographic analysis revealed fatigue crack initiation sites. Fatigue crack propagation in stage I was typical of smooth facets up to 500 μm long.
Klíčová slova: cyclic stress-strain curve; fatigue crack initiation; Fatigue life; focus ion beam; Nickel-based superalloy
Číslo projektu: GA15-20991S (CEP), TA04011525 (CEP)
Poskytovatel projektu: GA ČR, GA TA ČR
Zdrojový dokument: METAL 2017 - 26th International Conference on Metallurgy and Materials, Conference Proceedings, ISBN 978-80-87294-79-6

Instituce: Ústav fyziky materiálů AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: http://hdl.handle.net/11104/0286821

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-386536


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav fyziky materiálů
Konferenční materiály > Příspěvky z konference
 Záznam vytvořen dne 2018-10-02, naposledy upraven 2019-03-28.


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