Počet záznamů: 1  

LOW CYCLE FATIGUE BEHAVIOR AND FATIGUE CRACK INITIATION IN MAR-M247 AT 700 °C

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    SYSNO ASEP0491917
    Druh ASEPC - Konferenční příspěvek (mezinárodní konf.)
    Zařazení RIVD - Článek ve sborníku
    NázevLOW CYCLE FATIGUE BEHAVIOR AND FATIGUE CRACK INITIATION IN MAR-M247 AT 700 °C
    Tvůrce(i) Šulák, Ivo (UFM-A)
    Obrtlík, Karel (UFM-A) RID
    Hrbáček, K. (CZ)
    Celkový počet autorů3
    Zdroj.dok.METAL 2017 - 26th International Conference on Metallurgy and Materials, Conference Proceedings. - Ostrava : Tanger, 2017 - ISBN 978-80-87294-79-6
    Rozsah strans. 1580-1586
    Poč.str.7 s.
    Forma vydáníNosič - C
    AkceMETAL 2017: International Conference on Metallurgy and Materials /26./
    Datum konání24.05.2017 - 26.05.2017
    Místo konáníBrno
    ZeměCZ - Česká republika
    Typ akceWRD
    Jazyk dok.eng - angličtina
    Země vyd.CZ - Česká republika
    Klíč. slovaNickel-based superalloy ; cyclic stress-strain curve ; Fatigue life ; fatigue crack initiation ; focus ion beam
    Vědní obor RIVJL - Únava materiálu a lomová mechanika
    Obor OECDAudio engineering, reliability analysis
    CEPGA15-20991S GA ČR - Grantová agentura ČR
    TA04011525 GA TA ČR - Technologická agentura České republiky
    Institucionální podporaUFM-A - RVO:68081723
    UT WOS000434346900255
    EID SCOPUS85043373713
    AnotaceThe 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.
    PracovištěÚstav fyziky materiálu
    KontaktYvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485
    Rok sběru2020
Počet záznamů: 1