<div class="csl-bib-body">
<div class="csl-entry">Buerstmayr, R., Theska, F., Kozeschnik, E., Webster, R. F., Lison-Pick, M., Street, S. T. G., & Primig, S. (2023). Investigation and Simulation of the Effects of nm-Scale γ′ Precipitates on the Recrystallization of Ni-based Superalloys. <i>Metallurgical and Materials Transactions A</i>, <i>54</i>, 2259–2276. https://doi.org/10.1007/s11661-023-07008-w</div>
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dc.identifier.issn
1073-5623
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/177663
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dc.description.abstract
Superalloys are critical materials for the hottest sections of stationary gas turbines and aircraft engines. Homogeneously fine-grained microstructures are essential to unlock their superior high-temperature strength but are challenging to achieve in c¢-containing Ni-based superalloys. Such microstructures are achieved by recrystallization through hot working and grain boundary pinning via lm-scale second phase particles. Discontinuous dynamic recrystallization is the predominant restoration mechanism, where grain growth is restricted by Zener pinning. Nanometer-scale c¢ precipitates may exercise similar pinning during the nucleation stage and thus delay recrystallization. While the effects of coarse, lm-scale, precipitates during recrystallization and grain growth are well-known, descriptions for fine coherent precipitates are currently lacking. To address this scarcity of knowledge, both c¢-rich and -lean microstructures of the c¢-containing Ni-base superalloy Rene ́ 41 underwent identical uniaxial hot compression tests. Flow stress and microstructural analyses reveal the inhibition of recrystallization by nm-scale c¢ precipitates during both nucleation and growth stages. This effect is successfully described using thermo-kinetic modeling through application of a driving-force based model. These unique insights provide a novel pathway to unlock homogeneously fine-grained microstructures in c¢-containing Ni-based superalloys via advanced thermo-mechanical processing routes, required for applications in future generations of gas turbines and aircraft engines.
en
dc.language.iso
en
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dc.publisher
SPRINGER
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dc.relation.ispartof
Metallurgical and Materials Transactions A
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dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
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dc.subject
precipitation
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dc.subject
recrystallization
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dc.subject
Ni-based alloys
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dc.title
Investigation and Simulation of the Effects of nm-Scale γ′ Precipitates on the Recrystallization of Ni-based Superalloys