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Initiation of fatigue cracks and lifetime of Ni-base superalloys at high mean stress and temperature
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SYSNO ASEP 0483642 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Initiation of fatigue cracks and lifetime of Ni-base superalloys at high mean stress and temperature Author(s) Kunz, Ludvík (UFM-A) RID, ORCID
Horník, Vít (UFM-A)
Hutař, Pavel (UFM-A) RID, ORCID
Fintová, Stanislava (UFM-A) ORCIDNumber of authors 4 Source Title 3RD INTERNATIONAL SYMPOSIUM ON FATIGUE DESIGN AND MATERIAL DEFECTS (FDMD 2017). - Amsterdam : Elsevier, 2017 / Beretta S. ; Foletti S. ; Nicoletto G. ; Tovo R. - ISSN 2452-3216 Pages s. 44-49 Number of pages 6 s. Publication form Online - E Action FDMD 2017 - International Symposium on Fatigue Design and Material Defects /3./ Event date 19.09.2017 - 22.09.2017 VEvent location Lecco Country IT - Italy Event type WRD Language eng - English Country NL - Netherlands Keywords IN 713LC ; MAR-M247 ; creep/fatigue loading ; time to fracture Subject RIV JL - Materials Fatigue, Friction Mechanics OECD category Audio engineering, reliability analysis R&D Projects EG15_019/0004399 GA MPO - Ministry of Industry and Trade (MPO) Institutional support UFM-A - RVO:68081723 UT WOS 000452909100007 DOI 10.1016/j.prostr.2017.11.059 Annotation The effect of high-frequency cycling (120 Hz) superimposed on high tensile mean stress on a lifetime of cast Ni-base superalloys IN 713LC at 800 °C and MAR-M 247 at 900 °C was investigated. It has been found that both the alloys exhibit qualitatively similar behavior in creep/fatigue loading conditions. Superposition of small stress amplitudes on the tensile mean stress does not influence the time to fracture until the stress amplitude reaches a threshold value, which is dependent on the mean stress. The higher the mean stress the higher is the stress amplitude threshold value. The observed creep/fatigue behavior is governed by two mechanisms: (a) formation and growth of intergranular cracks by creep mechanism (b) initiation and growth of fatigue cracks from the intergranular creep cracks. The casting defects do not play any important role as regards the lifetime under investigated loading conditions. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2019
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