期刊
ACTA MATERIALIA
卷 58, 期 5, 页码 1607-1617出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.11.004
关键词
Creep; Oxidation; Modelling; Thin-walled structures; Nickel alloy
Creep test results of thin-walled specimens of the single-crystal nickel-base superalloy Rene N5 at 980 degrees 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, gamma'-free layer, gamma'-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 filial creep-oxidation model characterizes the creep behaviour of samples with small thicknesses and low initial stress with high accuracy. (c) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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