The Library
Influence of the initial cooling rate from γ′ supersolvus temperatures on microstructure and phase compositions in a nickel superalloy
Tools
Tools
Tools
Li, Muzi, Coakley, James, Isheim, Dieter, Tian, Gaofeng and Shollock, Barbara A. (2018) Influence of the initial cooling rate from γ′ supersolvus temperatures on microstructure and phase compositions in a nickel superalloy. Journal of Alloys and Compounds, 732 . pp. 765-776. doi:10.1016/j.jallcom.2017.10.263 ISSN 0925-8388.
|
PDF
WRAP-cooling-rate-supersolvus-temperatures-microstructure-phase-compositions-nickel-superalloy-Shollock-2017.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (5Mb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.jallcom.2017.10.263
Abstract
Different cooling paths from a supersolvus temperature have been applied to FGH96, a polycrystalline nickel base superalloy for turbine disc applications, in order to simulate the different microstructures that exist through the thickness of a disc following an industrial heat treatment. Secondary and tertiary γ′ precipitate size distributions and morphology have been analysed and compared for the different heat treatments using SEM and atom probe tomography (APT). Detailed compositional data for both γ′ precipitate and γ matrix are presented, and compared to equilibrium compositions calculated by Thermo-Calc. For the heat-treatments studied, the secondary γ′ composition indicates a shell of differing composition to that towards the precipitate core. From sequential equilibria compositional calculations, it is suggested that the ‘shell’ forms at a lower temperature than the precipitate core. The fine tertiary precipitates do not show the core-shell compositional differences on continuous cooling. W peaks are noted at the γ/γ′ interfacial region, which is of significance for retarding coarsening. A γ′ depletion zone surrounds the secondary precipitates, within which the γ matrix composition differs significantly to the γ far-field values, Finally, a precipitate nucleation and growth mechanistic model is suggested based on the experimental data and Thermo-Calc calculations.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | T Technology > TL Motor vehicles. Aeronautics. Astronautics | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
| Library of Congress Subject Headings (LCSH): | Heat resistant alloys -- Industrial applications, Nickel, Jet engines | ||||||||
| Journal or Publication Title: | Journal of Alloys and Compounds | ||||||||
| Publisher: | Elsevier BV | ||||||||
| ISSN: | 0925-8388 | ||||||||
| Official Date: | 25 January 2018 | ||||||||
| Dates: |
|
||||||||
| Volume: | 732 | ||||||||
| Page Range: | pp. 765-776 | ||||||||
| DOI: | 10.1016/j.jallcom.2017.10.263 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Date of first compliant deposit: | 2 November 2017 | ||||||||
| Date of first compliant Open Access: | 2 November 2017 | ||||||||
| Funder: | Beijing Institute of Aeronautical Materials, National Science Foundation (U.S.) Major Research Instrumentation Program (NSF-MRI), National Science Foundation (U.S.) (NSF), Northwestern Institute for Sustainability and Energy | ||||||||
| Grant number: | DMR 0420532, ONR DURIP N00014-0400798, N00014-0610539, N00014-0910781 (NSF-MRI), MRSE C program DMR-1121262 (NSF) |
Request changes or add full text files to a record
Repository staff actions (login required)
 |
View Item |
Downloads
Downloads per month over past year
