Microstructure and creep strength of different γ/γ′-strengthened Co-base superalloy variants

SCRIPTA MATERIALIA

卷:63

Article

Bauer, A.¹  Neumeier, S.^1,2  Pyczak, F.³  Goeken, M.¹ 

[1] Univ Erlangen Nurnberg, Inst 1, Dept Mat Sci & Engn, D-91058 Erlangen, Germany

[2] Univ Cambridge, Rolls Royce UTC, Dept Mat Sci & Met, Cambridge CB2 3QZ, England

[3] GKSS Forschungszentrum Geesthacht GmbH, Inst Mat Res, D-21502 Geesthacht, Germany

关键词: Superalloy;    Cobalt;    Thermal stability;    Volume fraction;    Creep;   

DOI  :  10.1016/j.scriptamat.2010.08.036

来源: Elsevier

【 摘 要 】

The influence of W, Ta, Ti, Nb, V, Si, Mo, Ir and Cr on the high temperature properties of gamma/gamma'-strengthened Co-Al-W superalloys was investigated. All alloys exhibited a gamma/gamma' microstructure with remarkably differing gamma' volume fractions. W, Ta, Ti, Nb and V increased the gamma' volume fraction and gamma' solvus temperature. An increased W content and alloying of additional elements, except Ir, decreased the liquidus temperature. First creep experiments revealed a creep strength comparable with polycrystalline Ni-base superalloys and the importance of grain boundary strengthening. (c) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free