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Stage I fatigue cracking in MAR-M 247 superalloy at elevated temperatures
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SYSNO ASEP 0465127 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Stage I fatigue cracking in MAR-M 247 superalloy at elevated temperatures Author(s) Šmíd, Miroslav (UFM-A) RID, ORCID
Hutař, Pavel (UFM-A) RID, ORCID
Horník, V. (CZ)
Hrbáček, K. (CZ)
Kunz, Ludvík (UFM-A) RID, ORCIDNumber of authors 5 Source Title 21st European Conference on Fracture. - Amsterdam : Elsevier, 2016 - ISSN 2452-3216 Pages 3018–3025, s. 3018-3025 Number of pages 8 s. Publication form Online - E Action ECF21 - European Conference on Fracture /21./ Event date 20.06.2016-24.06.2016 VEvent location Catania Country IT - Italy Event type WRD Language eng - English Country NL - Netherlands Keywords Superalloy ; High cycle fatigue ; Elevated temperature ; MAR-M 247 ; Fatigue crack initiation Subject RIV JL - Materials Fatigue, Friction Mechanics OECD category Audio engineering, reliability analysis R&D Projects TA04011525 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) ED1.1.00/02.0068 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFM-A - RVO:68081723 UT WOS 000387976803013 EID SCOPUS 85029900480 DOI 10.1016/j.prostr.2016.06.378 Annotation Nickel base superalloys exhibit fatigue fracture behavior with features of brittle-like cleavage cracking under high cycle fatigue loading at temperatures up to approximately 800 °C. This specific fracture behavior was already documented in several studies, but a possible mechanism of fatigue crack propagation under this mode has not been made completely clear yet. The aim of this paper is to put more light on the phenomenon by using advanced electron microscopy techniques like electron back-scattered diffraction (EBSD) and focused ion beam (FIB) sectioning. Fractured specimens after high cycle fatigue tests were thoroughly examined with the aim to localize the fatigue crack initiation sites and accompanying features of the fatigue crack propagation. Several specimens were cross-sectioned in order to characterize active slip systems, cyclic plastic deformation localization and fatigue crack propagation. Dislocation structures were studied by transmission electron microscopy (TEM). Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2017
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