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Role of defects in fatigue damage mechanisms of cast polycrystalline superalloy MAR-M 247
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SYSNO ASEP 0434596 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Role of defects in fatigue damage mechanisms of cast polycrystalline superalloy MAR-M 247 Author(s) Šmíd, Miroslav (UFM-A) RID, ORCID
Fintová, Stanislava (UFM-A) ORCID
Kunz, Ludvík (UFM-A) RID, ORCID
Hutař, Pavel (UFM-A) RID, ORCIDNumber of authors 4 Source Title Fatigue Design and Material Defects, FDMD II - JIP2014. - Paris : EDP Sciences, 2014 / Brune M. ; Buffiéne J.Y. ; Morel F. ; Nadot Y. - ISBN 978-2-7598-1274-5 Pages art. n. 03005 Number of pages 3 s. Publication form Print - P Action FDMD II - JIP 2014 International Spring Meeting SF2M Commission Fatigue /14./ Event date 11.06.2014-13.06.2014 VEvent location Paris Country FR - France Event type WRD Language eng - English Country FR - France Keywords Superalloys ; High-cycle fatigue ; Porosity analysis ; High temperatures ; Fracture surfaces Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects FR-TI4/030 GA MPO - Ministry of Industry and Trade (MPO) Institutional support UFM-A - RVO:68081723 UT WOS 000396718500011 EID SCOPUS 84903307388 DOI 10.1051/matecconf/20141203005 Annotation High-cycle fatigue life of nickel-based superalloy MAR-M 247 was experimentally determined for as-cast material and material processed by hot isostatic pressing (HIP). Fatigue testing was conducted at temperatures 650, 800, 900 ◦C in laboratory air. HIP was done at the following conditions: 1200 ◦C/100 MPa/240 min. It has been found that HIP significantly improves the fatigue life. Obtained results indicate that main factors which determine the fatigue strength of material in both conditions are grain size, grain orientation and size and distribution of casting defects. The distribution and size of the casting defects were evaluated by light microscopy on metallographic sections. The data were processed by the extreme value statistics, which enables to estimate the maximum size of a defect likely to occur in a defined volume. Light and scanning electron microscopy were used for fractographic investigation of fracture surfaces and fatigue crack initiation sites. Focused ion beam technique and transmission electron microscopy were applied with the aim to reveal the microstructure in the nearest vicinity of the early cracks. The mechanism of crack initiation, early crack propagation and the role of casting defects were described and discussed Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2015
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