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High Temperature Creep Properties of Cast Cobalt-Based Superalloys: A Comparison
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SYSNO ASEP 0511753 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title High Temperature Creep Properties of Cast Cobalt-Based Superalloys: A Comparison Author(s) Kvapilová, Marie (UFM-A) RID, ORCID
Sklenička, Václav (UFM-A) RID, ORCID
Král, Petr (UFM-A) RID, ORCID
Dvořák, Jiří (UFM-A) RID, ORCIDNumber of authors 4 Source Title Proceedings of the Second International Conference on Theoretical, Applied and Experimental Mechanics. - Cham : Springer Nature, 2019 / Gdoutos E. - ISSN 2522-560X - ISBN 978-3-030-21893-5 Pages s. 39-44 Number of pages 6 s. Publication form Print - P Action ICTAEM 2019 - International Conference on Theoretical, Applied and Experimental Mechanics /2./ Event date 23.06.2019 - 26.06.2019 VEvent location Corfu Country GR - Greece Event type WRD Language eng - English Country CH - Switzerland Keywords Cobalt-based superalloys ; Creep damage and fracture ; Breakage of primary carbides 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 UT WOS 000521731000008 EID SCOPUS 85085206541 DOI 10.1007/978-3-030-21894-2_8 Annotation Cast cobalt-based superalloys have already found applications in the glass industry to construct glass shaping tools. The present study deals with the high temperature characterization of the two cast cobalt-based CoNb and CoTa superalloys which have been developed for precision casting of a rotary fibreglass spinner disc for glass industry. The superalloys have been characterized through constant load creep tests at 1000, 1050 and 1100 °C in a tensile stress range from 20 to 100 MPa, with the aim to simulate the variation of mechanical properties occurring in a rotary fibreglass spinner disc at operational conditions. The results have been compared and discussed, with the aim to link the difference in creep properties to the evolution of creep damage and fracture in superalloys. It was found that the CoNb superalloy possesses longer creep life compared to the CoTa superalloy under the same loading conditions. Fractographic investigations of the creep fractured specimens of the examined superalloys revealed that the dominating creep fracture of the CoTa is of the ductile transgranular dimple fracture mode due to a loss of an external section of specimen (necking). By contrast, the final brittle fracture in the CoNb superalloys occurs via relatively fast propagation of the longest cracks after the ultimate state of creep damage is reach. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2021
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