Abstract
Mechanical behavior of Haynes282 is heavily dependent upon the microstructure state, calling for mesoscale model to study the relationship between the underlying microstructure and macroscopic performance. In this work, we employ crystal plasticity finite element method (CPFEM) to explore the deformation mechanisms of Hanyes282 subjected to tensile (short-term) and creep (long-term) tests. Haynes282 is a newly developed Ni-based superalloy, containing relatively low volume fraction (≤20%) of spherical γ′ precipitate phase. A dislocation-density based model is developed to describe the tensile and the creep behavior, where a dimension reduction algorithm is proposed to obtain more accurate inter-particle spacing. Furthermore, dislocation-particle interaction is incorporated by considering the transition between Orowan looping and shearing through the γ′ precipitates at various temperature levels under tensile condition. Under creep condition, glide-climb combined dislocation behavior is integrated. A novel climb model based on deposited climb dislocation density is proposed in this work, accounting for the accumulation of the dislocation during the climb process. Predicted tensile stress–strain curves at various temperature levels and creep strain responses at different stress levels and temperature levels are showing good agreement with corresponding experimental results. Analysis of the results indicates that dislocation shearing through the γ′ precipitates is acting as the main contributor to the strength of Haynes282 at both room temperature (RT) and elevated temperature. Both relatively larger stress and higher temperature are promoting the dislocation climb process over the γ′ precipitates during the creep, inducing higher deposited climb dislocation density network in the vicinity of γ-γ′. The present model provides a useful tool for predicting the long-term creep loading behavior by accounting for microstructure characteristics and can be easily extended to other Ni-based superalloys.
Recommended Citation
T. Chen et al., "Predicting The High Temperature Deformation Behavior Of Haynes282 By A Dislocation-density Based Crystal Plasticity Model," Materials Science and Engineering: A, vol. 923, article no. 147690, Elsevier, Feb 2025.
The definitive version is available at https://doi.org/10.1016/j.msea.2024.147690
Department(s)
Materials Science and Engineering
Keywords and Phrases
Crystal plasticity; Dislocations; Finite element model; Strength
International Standard Serial Number (ISSN)
0921-5093
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2025 Elsevier, All rights reserved.
Publication Date
01 Feb 2025
Comments
National Energy Technology Laboratory, Grant FE0031554