Počet záznamů: 1  

Surface relief evolution and fatigue crack initiation in René 41 superalloy cycled at room temperature

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    0543078 - ÚFM 2022 RIV CH eng J - Článek v odborném periodiku
    Babinský, Tomáš - Kuběna, Ivo - Šulák, Ivo - Kruml, Tomáš - Tobiáš, Jiří - Polák, Jaroslav
    Surface relief evolution and fatigue crack initiation in René 41 superalloy cycled at room temperature.
    Materials Science and Engineering A. Roč. 819, č. 5 (2021), č. článku 141520. ISSN 0921-5093. E-ISSN 1873-4936
    Grant CEP: GA MŠk(CZ) EF16_013/0001823; GA ČR(CZ) GA18-03615S; GA MŠk LM2015069
    Výzkumná infrastruktura: IPMINFRA - 90069
    Institucionální podpora: RVO:68081723
    Klíčová slova: René 41 superalloy * Low cycle fatigue * Surface relief evolution * Cyclic slip localisation * Persistent slip bands * Fatigue crack initiation
    Kód oboru RIV: JL - Únava materiálu a lomová mechanika
    Obor OECD: Audio engineering, reliability analysis
    Impakt faktor: 5.234, rok: 2020

    Surface relief evolution and fatigue crack initiation of René 41 superalloy was studied. The material was tested in two thermodynamical states: solutionised and aged. Cylindrical specimens were cycled at total strain amplitude 0.8% at room temperature. In order to study relevant mechanisms resulting in surface relief formation and eventually fatigue crack initiation, cycling was interrupted at definite number of elapsed cycles. After each interruption, the specimen surface was observed by means of scanning electron microscopy and thin lamellae were cut out of the surface and observed by means of transmission electron microscopy. Cyclic deformation was found to localise since the first cycle, causing the formation of persistent slip bands and persistent slip markings in the form of slip steps, extrusions and later intrusions as well. Continuous cycling led to the formation of new persistent slip markings as well as widening of the already existing ones. The role of persistent slip markings in fatigue crack initiation at room temperature was found to be crucial in this superalloy. The results were thoroughly discussed in relation to theoretical models of surface relief formation.
    Trvalý link: http://hdl.handle.net/11104/0321067
Počet záznamů: 1