Modelling and analysis of the oxidation influence on creep behaviour of thin-walled structures of the single-crystal nickel-base superalloy René N5 at 980 °C |
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Authors: | Matthias Bensch Johannes Preußner Rainer Hüttner Georgia Obigodi Sannakaisa Virtanen Johannes Gabel Uwe Glatzel |
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Affiliation: | 1. Metals and Alloys, University Bayreuth, Ludwig-Thoma-Str. 36b, 95447 Bayreuth, Germany;2. Dept. for Materials Science and Engineering, WW4-LKO, University of Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany;3. MTU Aero Engines, Dachauer Str. 665, 80995 Munich, Germany |
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Abstract: | Creep test results of thin-walled specimens of the single-crystal nickel-base superalloy René N5 at 980 °C under vacuum as well as under air show different creep properties depending on material thickness and atmosphere. The differences in creep strength and strain were analysed based on a creep-oxidation model. The model specifies the primary and secondary creep stages of thin-walled specimens by a sequence of layers. The model takes different zones affected by oxidation into account. Four layers were experimentally observed and considered in the model: oxide layer, γ′-free layer, γ′-reduced layer and the two-phase substrate in the sample as centre. Material parameters for growth laws of each layer were identified both by experimental analyses and by thermodynamic simulations. The final creep-oxidation model characterizes the creep behaviour of samples with small thicknesses and low initial stress with high accuracy. |
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