Hardy, M.C., Argyrakis, C., Kitaguchi, H.S. et al. (17 more authors) (2020) Developing alloy compositions for future high temperature disk rotors. In: Tin, S., Hardy, M., Clews, J., Cormier, J., Feng, Q., Marcin, J., O'Brien, C. and Suzuki, A., (eds.) Superalloys 2020 : Proceedings of the 14th International Symposium on Superalloys. Superalloys 2020 : 14th International Symposium on Superalloys, 12-16 Sep 2021, Seven Springs, PA, USA. The Minerals, Metals & Materials Series . Springer International Publishing , pp. 19-30. ISBN 9783030518332
Abstract
Two new alloy compositions for possible disk rotor applications have been examined. Both were intended to have higher γ′ content than the existing alloy, RR1000, and be produced using powder metallurgy and isothermal forging to enable forgings to show a consistent coarse grain microstructure. Small pancake forgings of the new alloys and RR1000 were made and from these, blanks were cut, solution heat treated, cooled at measured rates and aged. Results of screening tests to understand the tensile, creep and dwell crack growth behavior, oxidation resistance and phase stability of these new alloys and coarse grain RR1000 are reported. The development alloys were similar in composition but exhibited different tensile and creep properties, phase stability and resistance to oxidation damage. Despite attempts to minimize variation in microstructure from heat treatment, differences in γ′ size distribution were found to influence tensile and creep behavior. One of the new alloys (Alloy 2) showed improved yield and tensile strength compared to RR1000. Alloy 2 displayed similar initial creep strain behavior to RR1000 but superior resistance to subsequent creep damage, producing longer creep rupture lives. All of the alloys showed crack retardation at low stress intensity factor ranges (ΔK) from 3600 s dwell cycles at 700 °C in air. This occurred whilst crack growth was intergranular. Alloy 1 was found to precipitate C14 Laves phase from long term exposure at 800 °C. Like RR1000, σ phase was not detected in the new alloys after 750 h at 800 °C.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Editors: |
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Copyright, Publisher and Additional Information: | © 2020 Rolls-Royce plc. This is an author-produced version of a paper subsequently published in Proceedings of the 14th International Symposium on Superalloys. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Powder metallurgy; Phase stability; CALPHAD; Material properties |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 19 Feb 2021 09:31 |
Last Modified: | 29 Aug 2021 00:38 |
Status: | Published |
Publisher: | Springer International Publishing |
Series Name: | The Minerals, Metals & Materials Series |
Refereed: | Yes |
Identification Number: | 10.1007/978-3-030-51834-9_2 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:168288 |