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Creep Damage Mechanisms in Cast Cobalt Superalloys for Applications in Glass Industry
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SYSNO ASEP 0496176 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Creep Damage Mechanisms in Cast Cobalt Superalloys for Applications in Glass Industry Author(s) Kvapilová, Marie (UFM-A) RID, ORCID
Podhorná, B. (CZ)
Dvořák, Jiří (UFM-A) RID, ORCID
Král, Petr (UFM-A) RID, ORCID
Zýka, J. (CZ)
Hrbáček, Karel (UFM-A)
Sklenička, Václav (UFM-A) RID, ORCIDNumber of authors 7 Source Title Advances in Fracture and Damage Mechanics XVII. - Zürich : Trans Tech Publications, 2018 / Aliabadi F.M.H. ; Rodriguez-Tembleque L. ; Dominguez J. - ISSN 1013-9826 - ISBN 978-3-0357-1350-3 Pages s. 173-178 Number of pages 6 s. Publication form Print - P Action FDM 2018 - International Conference on Fracture and Damage Mechanics /17./ Event date 04.09.2018 - 06.09.2018 VEvent location Seville Country ES - Spain Event type WRD Language eng - English Country CH - Switzerland Keywords cobalt superalloys ; creep ; microstructure ; damage ; fracture processes Subject RIV JG - Metallurgy OECD category Materials engineering R&D Projects FV10699 GA MPO - Ministry of Industry and Trade (MPO) LM2015069 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFM-A - RVO:68081723 EID SCOPUS 85053035207 DOI 10.4028/www.scientific.net/KEM.774.173 Annotation Two cast NbC and TaC- strengthened cobalt-base superalloys have been developed for a precision casting of spinner discs for glass wool industry. In the present study, the relationships between the type and morphology of carbides and the degradation processes in both types of cast cobalt-based superalloys subjected to high temperature creep have been examined. It was found that the nature of carbides within the alloy microstructure plays a critical role in determining the creep damage processes and microstructure stability of the alloy system under high temperature creep. The morphology of the carbides is a strong function of their chemical composition. The interface decohesion between the complex carbides and the matrix and cracking of the brittle carbides homogeneously distributed in the crept NbC - strengthened alloy lead to brittle intergranular and/or interdendritic fracture. By contrast, Ta - strengthened alloy exhibited very small extent of isolated creep damage and the final fracture is ductile transgranular mode. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2019
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