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ID 115401
Author
Terada, Yoshihiro Tokyo Institute of Technology
Adziman, Fauzan University of Oxford
Crudden, David J. University of Oxford
Collins, David M. University of Oxford
Armstrong, David E. J. University of Oxford
Reed, Roger C. University of Oxford
Keywords
superalloy
nanoindentation
age-hardening
Nb/Ti ratio
Content Type
Journal Article
Description
The age-hardening behaviour and microstructure development of high strength Ni-based superalloys ABD-D2, D4, and D6 with varying Nb/Ti ratios have been studied. The studied alloys have large volume fractions and multimodal size distributions of the γ′ precipitates, making them sensitive to cooling conditions following solution heat treatment. Differential scanning calorimetry was conducted with a thermal cycle that replicated a processing heat treatment. The hardness of these alloys was subsequently evaluated by nanoindentation. The Nb/Ti ratio was not observed to influence the size and distribution of primary and secondary γ′ precipitates; however, the difference in those of tertiary γ′ and precipitate morphology were observed. The nanoindentation hardness for all alloys reduces once they have been solution-heat-treated. The alloys exhibited specific peak hardness. The alloy with the greatest Nb content was found to have the best increase in hardness among the alloys studied due to its large tertiary γ′ precipitate.
Journal Title
Metals
ISSN
20754701
Publisher
MDPI
Volume
7
Issue
3
Start Page
71
Published Date
2017-02-23
Rights
© 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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language
eng
TextVersion
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departments
Science and Technology