Creep Damage Mechanisms in Cast Cobalt Superalloys for Applications in Glass Industry

0496176 - ÚFM 2019 RIV CH eng C - Conference Paper (international conference)
Kvapilová, Marie - Podhorná, B. - Dvořák, Jiří - Král, Petr - Zýka, J. - Hrbáček, Karel - Sklenička, Václav
Creep Damage Mechanisms in Cast Cobalt Superalloys for Applications in Glass Industry.
Advances in Fracture and Damage Mechanics XVII. Zürich: Trans Tech Publications, 2018 - (Aliabadi, F.; Rodriguez-Tembleque, L.; Dominguez, J.), s. 173-178. Key Engineering Materials, 774. ISBN 978-3-0357-1350-3. ISSN 1013-9826.
[FDM 2018 - International Conference on Fracture and Damage Mechanics /17./. Seville (ES), 04.09.2018-06.09.2018]
R&D Projects: GA MPO FV10699; GA MŠMT LM2015069
Institutional support: RVO:68081723
Keywords : cobalt superalloys * creep * microstructure * damage * fracture processes
OECD category: Materials engineering

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.
Permanent Link: http://hdl.handle.net/11104/0289018