Počet záznamů: 1  

Thermomechanical fatigue and damage mechanisms in Sanicro 25 steel

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    0450226 - ÚFM 2017 RIV CH eng J - Článek v odborném periodiku
    Petráš, Roman - Škorík, Viktor - Polák, Jaroslav
    Thermomechanical fatigue and damage mechanisms in Sanicro 25 steel.
    Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. Roč. 650, JAN (2016), s. 52-62. ISSN 0921-5093. E-ISSN 1873-4936
    Grant CEP: GA MŠMT(CZ) EE2.3.30.0063; GA ČR(CZ) GA13-23652S
    Institucionální podpora: RVO:68081723
    Klíčová slova: thermomechanical fatigue * Sanicro 25 steel * damage mechanism * FIB cutting * localized oxidation-cracking
    Kód oboru RIV: JL - Únava materiálu a lomová mechanika
    Impakt faktor: 3.094, rok: 2016

    Heat resistant austenitic Sanicro 25 steel was subjected to in-phase and out-of-phase thermomechanical fatigue (TMF) loading conditions with different amplitudes of mechanical strain in a wide interval of temperatures (250-700°C). Cyclic hardening/softening curves, cyclic stress-strain curves and fatigue life curves were evaluated for both type of loadings. Scanning electron microscopy combined with FIB cutting and EBSD imaging in longitudinal sections containing cracks revealed the mechanisms responsible for fatigue crack initiation and growth. Fatigue cracks developed rapidly in oxidized grain boundaries during in-phase loading and intergranular crack growth resulted in short fatigue life. Multiple cracks in out-of-phase loading perpendicular to the stress axis have arisen only afterwards oxide layer was formed. The delayed initiation and transgranular growth led to longer fatigue life. The effect of grain boundary oxidation and surface oxide cracking on fatigue life was discussed.
    Trvalý link: http://hdl.handle.net/11104/0251596

     
     
Počet záznamů: 1  

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