Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 853, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.143761
Keywords
Microstructure; Dislocation; Orientation; Damage; Crystal plasticity
Categories
Funding
- National Natural Science Foundation of China [51875461, 51875462]
- National Science and Technology Major Project [2017-IV-0003-0040, 2017-V-0003-0052]
- Natural Science Basic Research Plan in Shaanxi Province of China [2020JC-16]
- Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University [CX2022042]
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This study focuses on the stress and strain responses of a second-generation nickel-based superalloy at different temperatures and orientations. Microstructure and dislocation arrangements were observed to analyze the fracture failure modes and dislocation morphologies. A new hardening model and damage evolution law were proposed and successfully fitted the stress-strain response for different conditions.
The mechanical properties of nickel-based single-crystal superalloys are sensitive to temperature and orientation. The present work focuses on the stress and strain responses of a second-generation nickel-based superalloy at different temperatures and with different orientations. Microstructure and dislocation arrangements are observed by scanning and transmission electron microscopy of samples after tensile testing. The results reveal the tensile fracture failure modes and dislocation morphologies (braids, cells, stacking faults, etc.) for different temperatures and orientations. Although the [001] sample shows higher yield strength than the other two orientations, the strain hardening was more significant at [111] orientation and stress softening at [011] orientation due to their different dislocation mechanisms. In addition, a new hardening model and damage evolution law are proposed and coupled with a crystal plastic constitutive model. Numerical analysis results show that the proposed constitutive model can accurately fit the full stress-strain response from tensile experiments for different temperatures and orientations.
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