Defects-Induced Fatigue Failure Behavior and Life Prediction of Laser Powder Bed Fusion GH4169 Superalloy in High and Very-High Cycle Regimes
文献类型：期刊论文
| 作者 | Mahmood, Asif1; Sun, Chuanwen1; Li, Wei1; Li C(李成)2; Lashari, Muhammad Imran1; Cao, Xiaobo1; Hu, Zifan1 |
| 刊名 | ADVANCED ENGINEERING MATERIALS
 |
| 出版日期 | 2025-07-27 |
| 页码 | 17 |
| 关键词 | defect-induced fatigue life predictions fatigue fracture behavior laser powder bed fusions solution aging very-high cycle fatigue |
| ISSN号 | 1438-1656 |
| DOI | 10.1002/adem.202500772 |
| 通讯作者 | Li, Wei(lliw@bit.edu.cn) |
| 英文摘要 | Laser powder bed fusion (LPBF) is a leading method for fabricating high-strength materials such as GH4169 superalloy. However, their deformation behavior must be thoroughly analyzed before they can be used in critical engineering applications. The fatigue behavior of LPBF GH4169, particularly in the very-high cycle regime, is not yet fully understood. Therefore, uniaxial fatigue tests are conducted to investigate high and very-high cycle fracture analysis and associated failure behaviors in the solution-aged condition under two stress ratios at room temperature. Subsequently, scanning electron microscopy, electron backscattered diffraction, and transmission electron microscopy are employed to observe the dislocation structures and fracture mechanism. Fracture surfaces reveal that cracks nucleate through a single site, typically on the surface or within the interior, driven by manufacturing or crystallographic defects. Interior failure is evident at lower stress amplitudes, with two distinct crack nucleation modes identified. Dislocation accumulation and interactions with delta phases are revealed. Furthermore, the coupling reinforcement of strengthening phases enhances the fatigue performance. Moreover, the threshold values as well as the transition sizes from small to long cracks increase as failures shift from surface to interior. Finally, a fatigue life prediction model is developed, demonstrating a strong correlation to the experimental results. |
| 分类号 | 二类 |
| WOS关键词 | INCONEL 718 SUPERALLOY ; TITANIUM-ALLOY ; CRACK INITIATION ; HEAT-TREATMENT ; DELTA-PHASE ; MECHANICAL-PROPERTIES ; ELEVATED-TEMPERATURE ; STRENGTH PREDICTION ; SURFACE-ROUGHNESS ; MICROSTRUCTURE |
| 资助项目 | National Natural Science Foundation of China ; [52175128] |
| WOS研究方向 | Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:001536651200001 |
| 资助机构 | National Natural Science Foundation of China |
| 其他责任者 | Li, Wei |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/102349]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China; 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Mahmood, Asif,Sun, Chuanwen,Li, Wei,et al. Defects-Induced Fatigue Failure Behavior and Life Prediction of Laser Powder Bed Fusion GH4169 Superalloy in High and Very-High Cycle Regimes[J]. ADVANCED ENGINEERING MATERIALS,2025:17. |
| APA | Mahmood, Asif.,Sun, Chuanwen.,Li, Wei.,李成.,Lashari, Muhammad Imran.,...&Hu, Zifan.(2025).Defects-Induced Fatigue Failure Behavior and Life Prediction of Laser Powder Bed Fusion GH4169 Superalloy in High and Very-High Cycle Regimes.ADVANCED ENGINEERING MATERIALS,17. |
| MLA | Mahmood, Asif,et al."Defects-Induced Fatigue Failure Behavior and Life Prediction of Laser Powder Bed Fusion GH4169 Superalloy in High and Very-High Cycle Regimes".ADVANCED ENGINEERING MATERIALS (2025):17. |
入库方式： OAI收割
来源：力学研究所
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