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Whole process analysis of low-cycle fatigue in [001]-oriented nickel-based superalloy: Integration of electron microscopy and acoustic emission.

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Title: Whole process analysis of low-cycle fatigue in [001]-oriented nickel-based superalloy: Integration of electron microscopy and acoustic emission.
Authors: Luo, Hongyun1,2,3 (AUTHOR) Luo7128@163.com, Zhao, Tianshu1,2 (AUTHOR), Liu, Jie1,2 (AUTHOR), Wang, Runze1,2 (AUTHOR), Wang, Di1,2 (AUTHOR), li, Yun1,2 (AUTHOR), Sun, Renshan1,4 (AUTHOR) sunrenshan@163.com
Source: Journal of Alloys & Compounds. Apr2025, Vol. 1022, pN.PAG-N.PAG. 1p.
Subjects: Fatigue cracks, Scanning transmission electron microscopy, Acoustic microscopy, Alloy fatigue, Transmission electron microscopy
Abstract: The fatigue damage behavior and macro–micro mechanisms in [001]-oriented Ni-based single-crystal superalloys were investigated in this study using acoustic emission (AE) monitoring during low-cycle fatigue (LCF) testing. Not only were the damage stages evaluated using AE analysis, but the comprehensive damage mechanisms during the entire LCF process were also elucidated by combining the findings from scanning electron microscopy and transmission electron microscopy. Utilizing the swallowtail catastrophe model, this study reveals the high sensitivity of cumulative AE signal counts and average frequencies to stage transitions during LCF, providing insights for identifying fatigue stages. It also elucidates the evolution of the damage mechanisms across different stages by considering the synergy between micro-dislocations and macro-cracks. Additionally, the relationship between typical dislocation configurations and solute interdiffusion between γ and γ' phases during LCF was investigated. The high-density dislocations that penetrate the phase boundaries are essential for initiating solute interdiffusion and influencing microstructural changes. The alterations in the dislocation configurations at various stages impact both interphase diffusion and microstructure development, ultimately leading to progressive changes in the fracture characteristics. This study provides insights into the typical microstructural evolution during LCF and its relationship with micro-defects, as well as the macro-fracture behavior. [Display omitted] • Analysis of AE parameters using swallowtail model helps identify LCF stages. • Damage characteristic under LCF can be associated with dislocation-crack synergy. • Dislocations that penetrate γ-γ' interfaces facilitate interphase solute diffusion. • Activated interphase diffusion plays a key role in the crack propagation stage. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The fatigue damage behavior and macro–micro mechanisms in [001]-oriented Ni-based single-crystal superalloys were investigated in this study using acoustic emission (AE) monitoring during low-cycle fatigue (LCF) testing. Not only were the damage stages evaluated using AE analysis, but the comprehensive damage mechanisms during the entire LCF process were also elucidated by combining the findings from scanning electron microscopy and transmission electron microscopy. Utilizing the swallowtail catastrophe model, this study reveals the high sensitivity of cumulative AE signal counts and average frequencies to stage transitions during LCF, providing insights for identifying fatigue stages. It also elucidates the evolution of the damage mechanisms across different stages by considering the synergy between micro-dislocations and macro-cracks. Additionally, the relationship between typical dislocation configurations and solute interdiffusion between γ and γ' phases during LCF was investigated. The high-density dislocations that penetrate the phase boundaries are essential for initiating solute interdiffusion and influencing microstructural changes. The alterations in the dislocation configurations at various stages impact both interphase diffusion and microstructure development, ultimately leading to progressive changes in the fracture characteristics. This study provides insights into the typical microstructural evolution during LCF and its relationship with micro-defects, as well as the macro-fracture behavior. [Display omitted] • Analysis of AE parameters using swallowtail model helps identify LCF stages. • Damage characteristic under LCF can be associated with dislocation-crack synergy. • Dislocations that penetrate γ-γ' interfaces facilitate interphase solute diffusion. • Activated interphase diffusion plays a key role in the crack propagation stage. [ABSTRACT FROM AUTHOR]
ISSN:09258388
DOI:10.1016/j.jallcom.2025.179976