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Creep of single crystals of nickel-based superalloys at ultra-high homologous temperature

  • The creep behavior of single crystals of the nickel-based superalloy CMSX-4 was investigated at 1288 °C, which is the temperature of the hot isostatic pressing treatment applied to this superalloy in the industry. It was found that at this super-solvus temperature, where no gammaPrime-strengthening occurs, the superalloy is very soft and rapidly deforms under stresses between 4 and 16 MPa. The creep resistance was found to be very anisotropic, e.g., the creep rate of [001] crystals was about 11 times higher than that of a [111] crystal. The specimens of different orientations also showed a very different necking behavior. The reduction of the cross-sectional area psi of [001] crystals reached nearly 100 pct, while for a [111] crystal psi = 62 pct. The EBSD analysis of deformed specimens showed that despite such a large local strain the [001] crystals did not recrystallize, while a less deformed [111] crystal totally recrystallized within the necking zone. The recrystallization degreeThe creep behavior of single crystals of the nickel-based superalloy CMSX-4 was investigated at 1288 °C, which is the temperature of the hot isostatic pressing treatment applied to this superalloy in the industry. It was found that at this super-solvus temperature, where no gammaPrime-strengthening occurs, the superalloy is very soft and rapidly deforms under stresses between 4 and 16 MPa. The creep resistance was found to be very anisotropic, e.g., the creep rate of [001] crystals was about 11 times higher than that of a [111] crystal. The specimens of different orientations also showed a very different necking behavior. The reduction of the cross-sectional area psi of [001] crystals reached nearly 100 pct, while for a [111] crystal psi = 62 pct. The EBSD analysis of deformed specimens showed that despite such a large local strain the [001] crystals did not recrystallize, while a less deformed [111] crystal totally recrystallized within the necking zone. The recrystallization degree was found to be correlated with deformation behavior as well as with dwell time at high temperature. From the analysis of the obtained results (creep anisotropy, stress dependence of the creep rate, traces of shear deformation, and TEM observations), it was concluded that the main strain contribution resulted from <01-1>{111} octahedral slip.zeige mehrzeige weniger

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Metadaten
Autoren/innen:A. Epishin, Bernard Fedelich, Gert Nolze, Sina Schriever, Titus Feldmann, M. Farzik Ijaz, B. Viguier, D. Poquillon, Y. Le Bouar, A. Ruffini, A. Finel
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Verlagsliteratur
Sprache:Deutsch
Titel des übergeordneten Werkes (Deutsch):Metallurgical and materials transactions A
Jahr der Erstveröffentlichung:2018
Organisationseinheit der BAM:5 Werkstofftechnik
5 Werkstofftechnik / 5.2 Experimentelle und modellbasierte Werkstoffmechanik
Herausgeber (Institution):The Minerals, Metals and Materials Society (TMS)
Verlag:Springer Sciences & Business Media
Verlagsort:New York, NY
Jahrgang/Band:49A
Ausgabe/Heft:9
Erste Seite:3973
Letzte Seite:3987
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:Creep; Isostatic hot pressing (HIP); Single-crystal; Superalloy
Themenfelder/Aktivitätsfelder der BAM:Material
Material / Life Cycle von Komponenten
Veranstaltung:3rd European Conference on Superalloys (‘Eurosuperalloys 2018’)
Veranstaltungsort:Oxford, UK
Beginndatum der Veranstaltung:9.9.2018
Enddatum der Veranstaltung:13.9.2018
DOI:https://doi.org/10.1007/s11661-018-4729-6
URL:http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord&KeyUT=CCC:000440714700018
ISSN:1073-5623
ISSN:1543-1940
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:07.08.2018
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:17.08.2018