High-temperature and low-stress creep anisotropy of single-crystal superalloys

The high-temperature and low-stress creep (1293K, 160MPa) of the single-crystal Ni-based superalloy LEK 94 is investigated, comparing the tensile creep behavior of miniature creep specimens in [001] and [110] directions. In the early stages of creep, the [001]-direction loading shows higher minimum...

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Bibliographic Details
Published in:Acta materialia 2013-05, Vol.61 (8), p.2926-2943
Main Authors: Agudo Jácome, L., Nörtershäuser, P., Heyer, J.-K., Lahni, A., Frenzel, J., Dlouhy, A., Somsen, C., Eggeler, G.
Format: Article
Language:English
Subjects:
Applied sciences
Creep
Creep anisotropy
Deformation mechanisms
Dislocations
Exact sciences and technology
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Rafting
Superalloy single crystals
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Summary:The high-temperature and low-stress creep (1293K, 160MPa) of the single-crystal Ni-based superalloy LEK 94 is investigated, comparing the tensile creep behavior of miniature creep specimens in [001] and [110] directions. In the early stages of creep, the [001]-direction loading shows higher minimum creep rates, because a greater number of microscopic crystallographic slip systems are activated, the dislocation networks at γ/γ′ interfaces accommodate lattice misfit better, and γ channels are wider. After the creep rate minimum, creep rates increase more strongly as a function of strain for [110] tensile loading. This may be related to the nature of rafting during [110] tensile creep, which results in a more open topology of the γ channels. It may also be related to more frequent γ′ cutting events compared with [100] tensile creep.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2013.01.052