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Creep fracture ductility of cobalt-based superalloys
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SYSNO ASEP 0534028 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Creep fracture ductility of cobalt-based superalloys Author(s) Kvapilová, Marie (UFM-A) RID, ORCID
Král, Petr (UFM-A) RID, ORCID
Dvořák, Jiří (UFM-A) RID, ORCID
Sklenička, Václav (UFM-A) RID, ORCIDNumber of authors 4 Source Title Proceedings of the First International Conference on Theoretical, Applied and Experimental Mechanics. - Cham : Springer Nature, 2019 / Gdoutos Emanuel E. - ISSN 2522-560X - ISBN 978-3-319-91989-8 Pages s. 184-189 Number of pages 6 s. Publication form Print - P Action ICATEM - First International Conference on Theoretical, Applied and Experimental /1./ Event date 17.06.2018 - 20.06.2018 VEvent location Paphos Country CY - Cyprus Event type WRD Language eng - English Country CH - Switzerland Keywords Cobalt based superalloys ; creep fracture mode ; damage tolerance zone Subject RIV JG - Metallurgy OECD category Materials engineering R&D Projects FV10699 GA MPO - Ministry of Industry and Trade (MPO) Institutional support UFM-A - RVO:68081723 UT WOS 000521737400041 EID SCOPUS 85085158995 DOI 10.1007/978-3-319-91989-8_41 Annotation The challenge and demands of environmental protection and energy saving have been more and more serious tasks in some processing technologies of glass industry. Significant effort is being carried out for the development of advanced technology for precision casting of spinner discs for glass industry (glass wool) and high temperature applications up to 1050 °C. In this paper a study creep facture processes of two different cobalt-based superalloys Co Stelit and Co Ursa Stelit was investigated. Constant load uniaxial stress creep tests in tension were carried out at three different testing temperatures of 900 °C, 950 °C and 1000 °C and at the applied stress ranging from 40 to 200 MPa. A mutual comparison of the creep characteristics of the investigated alloys under comparable creep loading conditions shows that the cobalt based superalloy co Stelit exhibits more brittle character of fracture than superalloy Co Ursa Stelit. By contrast, the values of time to fracture (creep life) are longer for the superalloy Co Stelit in comparison to those for superalloy Co Ursa Stelit. The analyses of creep data indicate that creep behaviour of the superalloys under investigation obey both Monkman-Grant and its modified version. The creep fracture modes of these superalloys were determined using empirical formulas based on a continuum damage mechanics approach. The values of damage tolerance factor gamma correspond to mixture of transgranular and intergranular type of fracture of both superalloys. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2021
Number of the records: 1