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Role of TCP phases on crack propagation in high temperature fatigue of single crystal Ni-based superalloys

Meid, Carla und Bartsch, Marion und Kostka, Aleksander (2016) Role of TCP phases on crack propagation in high temperature fatigue of single crystal Ni-based superalloys. Materials Science and Engineering 2016, 2016-09-27 - 2016-09-29, Darmstadt, Deutschland.

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Kurzfassung

Single crystal Ni-base superalloys used for gas turbine blades operate at high temperature and under complex stress state. High strength and high resistance against creep and fatigue is provided by the γ-/γ’- microstructure with cubic ’-precipitates separated by channels. Solid solution strengthening of the channels is provided by enrichment of Co, Cr, Re, and W [1, 2]. However, these strengthening elements have the tendency to form brittle phases, such as the so called TCP (topologically closed packed) phases. TCP phases can have a deleterious effect on the creep properties of superalloys [3] and influence the fatigue properties due to the depletion of the γ-matrix of strengthening elements in the vicinity of the TCP-phases [4]. Own observations made in high temperature low cycle fatigue (LCF) experiments indicate that formation of TCP-phases may have beneficial effects on the evolution of fatigue damages. LCF tests have been performed on a second generation single crystal superalloy with the nominal chemical composition of CMSX-4® at a test temperature of 950°C. Microstructural analyses of tested specimens show that cracks initiate at pores and propagate along two possible paths, i.e. (i) perpendicular to the loading direction through the γ-channels or (ii) along {111}-slip planes. The formation of TCP-phases seems to be linked with the presence of stress-/strain-concentrations since they only appear along crack paths and slip bands and at pores. This assumption is backed by preliminary EBSD-investigations, which reveal crystallographic misorientation at these locations. Slight crack path deviations of mode I cracks at TCP-phases indicate that TCP-phase formation can act as obstacles for cracks propagating along γ-channels. TCP-phases evolving along slip planes may also act as obstacles against further propagation of shear bands and may even enable subsequent healing of sheared microstructure, as suggested by TCP-phases aligned along slip planes in apparently undisturbed microstructure.

elib-URL des Eintrags:https://elib.dlr.de/108262/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Role of TCP phases on crack propagation in high temperature fatigue of single crystal Ni-based superalloys
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Meid, Carlacarla.meid (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Bartsch, Marionmarion.bartsch (at) dlr.dehttps://orcid.org/0000-0002-3952-2928NICHT SPEZIFIZIERT
Kostka, AleksanderRuhr-Universität BochumNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:28 September 2016
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Nickelbasis-Superlegierung, Ermüdung, Hochtemperaturverhalten
Veranstaltungstitel:Materials Science and Engineering 2016
Veranstaltungsort:Darmstadt, Deutschland
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:27 September 2016
Veranstaltungsende:29 September 2016
Veranstalter :DGM e.V.
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebssysteme
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Engine Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtuelles Triebwerk und Validierungsmethoden (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Experimentelle und numerische Methoden
Hinterlegt von: Meid, Carla
Hinterlegt am:28 Nov 2016 07:33
Letzte Änderung:10 Jul 2024 12:02

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