Crystal plasticity modeling of cyclic deformation for a polycrystalline nickel-based superalloy at high temperature

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:527

Article

Lin, B.¹  Zhao, L. G.¹  Tong, J.¹  Christ, H. -J.² 

[1] Univ Portsmouth, Dept Mech & Design Engn, Portsmouth PO1 3DJ, Hants, England

[2] Univ Siegen, Inst Mat Technol, D-57068 Siegen, Germany

关键词: Crystal plasticity;    Cyclic deformation;    Finite element;    Representative volume element;    Heterogeneous deformation;   

DOI  :  10.1016/j.msea.2010.02.045

来源: Elsevier

【 摘 要 】

Cyclic deformation at elevated temperature has been modeled for a polycrystalline nickel-based superalloy using the crystal-plasticity constitutive formulations. Finite element analyses were carried out for a representative volume element (RVE), consisting of randomly oriented grains and subjected to periodic boundary constraints. Model parameters were determined by fitting the strain-controlled cyclic test data at 650 C for three different loading rates. Simulated results are in good agreement with the experimental data for both stress-strain loops and cyclic hardening behavior. The model was utilized to predict the stress relaxation behavior during the hold periods at the maximum and minimum strain levels, and the prediction compares well with the experimental results. Localized stress and strain concentrations were observed due to the heterogeneous nature of grain microstructure and the mismatch of the mechanical properties of individual grains. (c) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

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