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- Title
On the Precipitation-Strengthening Contribution of the Ta-Containing Co3(Al,W)-Phase to the Creep Properties of γ/γ′ Cobalt-Base Superalloys.
- Authors
Bezold, A.; Volz, N.; Xue, F.; Zenk, C. H.; Neumeier, S.; Göken, M.
- Abstract
The creep strength of single-crystalline Co-based superalloys was found to be comparable to first-generation Ni-base superalloys. However, considerable shearing of the γ′ precipitates was observed in the early creep stages. To determine the strengthening contribution of the Ta-containing γ′-Co3(Al,W) precipitates, the creep strength of several single-crystalline Co-Al-W-Ta superalloys was determined as a function of the γ′ volume fraction at 1223 K (950 °C) and stress levels between 25 and 600 MPa. Employing a Lagneborg–Bergman–Reppich (LBR) approach, it is found that the strengthening contribution of the γ′ precipitates increases significantly with increasing γ′ volume fraction. In a Co-base superalloy that exhibits a precipitate volume fraction of about 70 pct, the γ′-strengthening contribution calculated with the LBR approach ranges between the ones observed in first-generation Ni-base superalloy CMSX-6 and second-generation Ni-base superalloy CMSX-4.
- Subjects
HEAT resistant alloys; NICKEL alloys; CREEP (Materials); FRACTIONS
- Publication
Metallurgical & Materials Transactions. Part A, 2020, Vol 51, Issue 4, p1567
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-020-05626-2