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AbstractAbstract
[en] Metallographic studies with gas turbine blades from operation and creep-rupture tests showed that nimonic 81 tends to precipitate elementary chromium in needle and flake shape at a temperature of 650-7500C after a time > 2,000 h. These precipitations are accompanied by a reduced fracture strain and a slight fatigue notch sensitivity in the creep-rupture test after about 5,000 h. (orig./AK)
[de]
Durch metallkundliche Untersuchungen an Gasturbinenschaufeln aus dem Betrieb und an Zeitstandsproben konnte festgestellt werden, dass Nimonic 81 im Temperaturgebiet von 650-7500C nach Zeiten > 2.000 h zur Ausscheidung von elementarem Chrom in Form von Nadeln und Plaettchen neigt. Diese Ausscheidungen gehen einem Absinken der Bruchdehnung sowie Entwicklung einer leichten Kerbempfindlichkeit im Zeitstandsversuch nach ca. 5.000 h parallel. (orig.)Original Title
Beobachtungen zu Gefuegestabilitaet und Zeitstandsverhalten der Legierung Nimonic 81
Primary Subject
Source
15 figs.; 3 tabs.; 9 refs.
Record Type
Journal Article
Journal
Metall; v. 29(1); p. 33-38
Country of publication
CARBIDES, CHROMIUM, CORROSION RESISTANT ALLOYS, CREEP, CRYSTAL STRUCTURE, ELECTRON MICROSCOPY, ELONGATION, HEAT TREATMENTS, HIGH TEMPERATURE, MECHANICAL TESTS, NIMONIC, NOTCHES, PHASE DIAGRAMS, PHASE STUDIES, PHOTOMICROGRAPHY, PRECIPITATION, RUPTURES, STABILITY, TIME DEPENDENCE, TURBINE BLADES, X-RAY DIFFRACTION
ALLOYS, CARBON COMPOUNDS, CHROMIUM ALLOYS, COHERENT SCATTERING, DIAGRAMS, DIFFRACTION, ELEMENTS, FAILURES, HEAT RESISTING ALLOYS, MATERIALS TESTING, MECHANICAL PROPERTIES, METALS, MICROSCOPY, NICKEL ALLOYS, NICKEL BASE ALLOYS, PHOTOGRAPHY, SCATTERING, SEPARATION PROCESSES, TESTING, TRANSITION ELEMENT ALLOYS, TRANSITION ELEMENTS
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