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Rafting microstructure during creep of the MC2 nickel-based superalloy at very high temperature

Touratier, Fabienne and Andrieu, Eric and Poquillon, Dominique and Viguier, Bernard Rafting microstructure during creep of the MC2 nickel-based superalloy at very high temperature. (2009) Materials Science and Engineering A, vol. 510-511 . pp. 244-249. ISSN 0921-5093

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Official URL: http://dx.doi.org/10.1016/j.msea.2008.04.100

Abstract

Directional coarsening of the single-crystalline nickel-based superalloy MC2 has been investigated by means of tensile creep tests at 1100 ◦C. Two specific specimen geometries were designed in order to generate a variety of stress and strain states. Different coarsening microstructures are observed: N- and P-type classical rafting but also coarsening oriented 45◦ away from the load axis. The comparison of microstructure maps with the local mechanical state evaluated by finite element calculations shows that the 45◦ directional coarsening appears in case of very high cumulated strain values (above 10%), independent of the stress sign. Transmission electron microscopy investigations showthat the dislocation microstructure is similar in both N-type and 45◦ coarsened areas.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Materials Science and Engineering: A website : http://www.sciencedirect.com/science/journal/09215093
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Turbomeca (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By:Nihad Lahdifi

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