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Fatigue crack initiation and growth in 43Fe-25Ni-22.5Cr austenitic steel at a temperature of 700 °C
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SYSNO ASEP 0492025 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Fatigue crack initiation and growth in 43Fe-25Ni-22.5Cr austenitic steel at a temperature of 700 °C Author(s) Mazánová, Veronika (UFM-A)
Heczko, Milan (UFM-A) ORCID
Polák, Jaroslav (UFM-A) RID, ORCIDNumber of authors 3 Source Title International Journal of Fatigue. - : Elsevier - ISSN 0142-1123
Roč. 114, SEP (2018), s. 11-21Number of pages 11 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords High temperature fatigue ; oxidation ; crack initiation ; crack growth ; Sanicro 25 Subject RIV JL - Materials Fatigue, Friction Mechanics OECD category Audio engineering, reliability analysis R&D Projects LM2015069 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LQ1601 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA13-23652S GA ČR - Czech Science Foundation (CSF) GA15-08826S GA ČR - Czech Science Foundation (CSF) EF16_027/0008056 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFM-A - RVO:68081723 UT WOS 000441487100002 EID SCOPUS 85047597808 DOI 10.1016/j.ijfatigue.2018.04.033 Annotation Crack initiation and short crack growth in highly-alloyed austenitic steel Sanicro 25 cyclically strained at atemperature of 700 °C has been studied. Specimens cycled to 10% of the fatigue life and to the fracture wereinspected using scanning electron microscopy and electron backscatter diffraction. On the surface, thin lamellaewere extracted site-specifically by focused ion beam and then they were further characterized by high spatialresolution scanning transmission electron microscopy and energy dispersive X-ray spectroscopy. The preferentialoxidation of grain boundaries was found to play a principal role in the initiation of multiple cracks. The oxidescale was analysed to show the distribution of individual elements during crack initiation and growth. Two typesof crack paths were observed: intergranular due to the oxidation and transgranular accompanied by a cyclicplastic zone. Cracks preferentially initiated at the grain boundaries perpendicular to the stress axis and propa-gated in the bulk of the material. The role of the oxidation in high temperature fatigue crack initiation isdiscussed as well as the mechanisms of the crack initiation and growth. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2019
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