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In-situ Study of the Mechanisms of High Temperature Damage
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SYSNO ASEP 0435392 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title In-situ Study of the Mechanisms of High Temperature Damage Author(s) Petrenec, M. (CZ)
Polák, Jaroslav (UFM-A) RID, ORCID
Šamořil, T. (CZ)
Dluhoš, J. (CZ)
Obrtlík, Karel (UFM-A) RID, ORCIDNumber of authors 5 Source Title 11th International Fatigue Congress. - Zurich : Trans Tech Publications, 2014 / Clark G. ; Wang Ch. - ISSN 1022-6680 - ISBN 978-3-03835-008-8 Pages s. 891-892 Number of pages 6 s. Publication form Print - P Action Fatigue 2014 - International Fatigue Congress /11./ Event date 02.03.2014-07.03.2014 VEvent location Melbourne Country AU - Australia Event type WRD Language eng - English Country CH - Switzerland Keywords fatigue damage ; high temperature ; nickel superalloy ; TEM lamella Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects GA13-23652S GA ČR - Czech Science Foundation (CSF) Institutional support UFM-A - RVO:68081723 UT WOS 000337767700083 EID SCOPUS 84898881690 DOI 10.4028/www.scientific.net/AMR.891-892.530 Annotation In-situ Low Cycle Fatigue test (LCF) at temperature 635 °C have been performed in SEM on flat specimen of cast Inconel 713LC superalloy. The aim of the investigation was to study mechanisms of the fatigue damage during elastic-plastic cycling by the observations of the characteristic surface relief evolution and the accompanying internal dislocation structures. The selected locations on the surface were systematically studied in-situ and documented by SEM and using AFM. The surface relief in the first tensile half-cycle was formed by numerous slip steps on the primary slip planes (111). In the following compression half-cycle additional opposite slip were formed. The relief was modified in the next cycles but without forming additionally new slip traces in the primary system. The reorientation of two grains in the gauge area was measured using EBSD. At the end of cyclic loading the relation between surface persistent slip markings and persistent slip bands in the interior of the material was documented by TEM on lamella prepared by FIB. The early stages of extrusion and intrusion formation were documented. The damage mechanism evolution is closely connected with the cyclic strain localization to the persistent slip bands that are also places of fatigue crack initiation. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2015
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