高低循环疲劳下 DZ125 定向凝固超合金的断裂失效分析

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics Pub Date : 2024-09-04 DOI:10.1016/j.engfracmech.2024.110459

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引用次数: 0

摘要

本研究调查了 DZ125 定向凝固镍基超级合金在高低循环疲劳（CCF）组合载荷下的断裂失效行为。研究发现，DZ125 合金在承受不同 CCF 载荷时存在竞争性开裂行为。最大低循环疲劳（LCF）名义应力或高循环疲劳（HCF）应力振幅的增加导致裂纹起始点从表面下的孔隙或碳化物过渡到表面氧化物。随着 HCF 与 LCF 周期比的增加，裂纹起始点也从表层下碳化物转移到表面氧化物。

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Fracture failure analysis of DZ125 directionally solidified superalloy under combined high and low cycle fatigue

Fracture failure behaviors of DZ125 directionally solidified nickel-base superalloy under combined high and low cycle fatigue (CCF) loads are investigated in this study. It is found that competitive cracking behaviors are present in DZ125 alloy while subjected to different CCF loads. An increase in the maximum low-cycle fatigue (LCF) nominal stress or high-cycle fatigue (HCF) stress amplitude results in a transition of crack initiation sites from subsurface pores or carbides to surface oxides. As the cycle ratio of HCF to LCF rises, crack initiation sites shift from subsurface carbides to surface oxides.

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来源期刊

Engineering Fracture Mechanics 物理-力学

CiteScore

8.70

自引率

13.00%

发文量

606

审稿时长

74 days

期刊介绍： EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.