Journal Article

PUBDB-2015-03598

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Influence of Iridium on the Properties of $\gamma$′-Strengthened Co-Base Superalloys

Bauer, A. (Corresponding author) ; Neumeier, S.>Extern* ; Pyczak, F.>Extern* ; Göken, M.

2015
Wiley-VCH Verl. Weinheim

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Please use a persistent id in citations: doi:10.1002/adem.201400266

Abstract: The influence of iridium on the phase stability, oxidation behavior, and high temperature creep strengthof g0-hardened Co-base superalloys is discussed. Ir increases the g0-solvus temperature and g0-volumefraction since it partitions slightly to the g0-phase. However, Ir leads also to a discontinuousprecipitation transformation of the metastable g/g0-microstructure into a lamellar microstructure ofCo3W, CoAl, and a Co-rich fcc phase for the W-rich alloys. A reduction ofWin presence of Ir leads to ahigher phase stability. The constrained lattice misfit between the g and g0 phase in the Ir and high Wcontaining alloy is þ0.5%. The alloying element Ir strongly increases the creep strength at 850 °C aslong as the g/g0-microstructure is not discontinuously transformed. Furthermore, the oxidationresistance is improved by the addition of iridium.

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Contributing Institute(s):

1. Zentrum für Material- und Küstenforschung (HZG)

Research Program(s):

1. 6G3 - PETRA III (POF3-622) (POF3-622)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2015

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Database coverage:
; Current Contents - Engineering, Computing and Technology ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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