Asymmetric creep deformation of a single crystal superalloy

Journal Article · Sat Apr 01 04:00:00 EST 1995 · Acta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-7151(94)00383-S· OSTI ID:39839

Pan, L M; Henderson, M B; Shollock, B A; McLean, M ^[1]; Scheibli, I ^[2]

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1. Imperial Coll. of Science, Technology and Medicine, London (United Kingdom). Dept. of Materials
2. Ecole Polytechnique Federale de Lausanne (Switzerland). Mechanical Engineering Dept.

The anisotropic creep behavior of single crystal superalloys leads to changes in the orientation and shape of specimens of arbitrary initial orientations during high temperature deformation. A model of anisotropic creep has been applied to a creep database for the single crystal superalloy SRR99 tested in uniaxial tension on <001> and <111> orientations in order to evaluate the model parameters. These have been used to predict the changes in specimen cross-sectional shape resulting from creep deformation of more complex orientations. Experimental measurements have been made of the cross-sectional dimensions of initially cylindrical specimens as a function of local creep strain. The agreement between experimental measurement and model prediction is normally very good. The biggest disagreement, for the <211> specimen, indicates that macroscopic cube slip is dominant rather than mixed cube and octahedral deformation as indicated by the model.

• OSTI ID: 39839
• Journal Information: Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 4 Vol. 43; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
CREEP
GRAIN ORIENTATION
HEAT RESISTING ALLOYS
MATHEMATICAL MODELS
MONOCRYSTALS
SAMPLE PREPARATION
SLIP