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Effect of systematic pre-ageing on crack Initiation and Propagation in a coated superalloy during low cycle fatigue at 950°C

Wischek, Janine and Subramaniam, Anankan and Chernova, Liudmila and Bartsch, Marion (2017) Effect of systematic pre-ageing on crack Initiation and Propagation in a coated superalloy during low cycle fatigue at 950°C. In: LCF 8 Eight International Conference on Low Cycle Fatigue, pp. 35-40. DVM e.V.. LCF 8 Eight International Conference on Low Cycle Fatigue, 26.-29. Jun. 2017, Dresden, Deutschland. ISBN 978-3-9814516-5-8

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Abstract

Low cycle fatigue (LCF) experiments have been performed at 950°C with R = -1 under strain control on specimens made from cast nickel-based superalloy IN 100 coated with a NiCoCrAlY oxidation protection layer. Specimens were tested after processing and systematic pre-ageing, respectively. The LCF tests were interrupted after defined number of cycles, and the specimens were investigated by microscopic and microanalytic methods for characterizing the effect of systematic pre-ageing on crack initiation and propagation. The microstructural evolution due to ageing only has been systematically investigated on separate specimens in order to achieve information on interaction between fatigue and ageing. Main observations were (1) due to pre-aging a thermally grown oxide (TGO) layer formed on the coating surface, and at the interface between substrate and coating a diffusion zone with intermetallic phases evolved, (2) fatigue cracks were initiated at the oxidized surface, predominantly at rumpling instabilities of the TGO, and (3) crack propagation was influenced by the spatial distribution and morphology of intermetallic phases in the diffusion zone between coating and substrate. The obtained results reveal complex interaction of mechanisms due to ageing and LCF loading. The observed effects on crack initiation and growth will be discussed with respect to strategies for accelerated testing by separation of pre-aging and fatigue and prospects to life time extension of components.

Item URL in elib:https://elib.dlr.de/114649/
Document Type:Conference or Workshop Item (Speech)
Title:Effect of systematic pre-ageing on crack Initiation and Propagation in a coated superalloy during low cycle fatigue at 950°C
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wischek, Janinejanine.wischek (at) dlr.deUNSPECIFIED
Subramaniam, Anankananankan.subramaniam (at) dlr.deUNSPECIFIED
Chernova, Liudmilaliudmila.chernova (at) dlr.deUNSPECIFIED
Bartsch, Marionmarion.bartsch (at) dlr.deUNSPECIFIED
Date:26 June 2017
Journal or Publication Title:LCF 8 Eight International Conference on Low Cycle Fatigue
Refereed publication:Yes
Open Access:No
In DOAJ:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 35-40
Editors:
EditorsEmail
Beck, TillmannTU Kaiserslautern
Charaluk, E.Ecole Polytechnique, Palaiseau
Publisher:DVM e.V.
Series Name:LCF 8
ISBN:978-3-9814516-5-8
Status:Published
Keywords:Super alloy; metallic coating; ageing; low cycle fatigue; crack Initiation; crack Propagation; failure mechanisms, accelerated testing
Event Title:LCF 8 Eight International Conference on Low Cycle Fatigue
Event Location:Dresden, Deutschland
Event Type:international Conference
Event Dates:26.-29. Jun. 2017
Organizer:DVM
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research
Institute of Materials Research > Mechanical Testing of Materials
Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Wischek, Janine
Deposited On:16 Oct 2017 09:19
Last Modified:16 Oct 2017 09:19

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