The mechanical coupling effect of laser shock and shot peening in Ti–6Al–4V dovetail joint: Residual stress, microstructure and fretting fatigue behavior
This research systematically investigates the strengthening effects of laser shock peening (LSP), shot peening (SP), and combined LSP + SP on the fretting fatigue behavior of Ti–6Al–4V dovetail joints under different load levels. Multi-scale characterization reveals that all treatments generate grad...
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Elsevier
2025-07-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425016734 |
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| author | Chen Wang Xiong Zhang Yan Yin Weifeng He Yibo Shang Liucheng Zhou |
| author_facet | Chen Wang Xiong Zhang Yan Yin Weifeng He Yibo Shang Liucheng Zhou |
| author_sort | Chen Wang |
| collection | DOAJ |
| description | This research systematically investigates the strengthening effects of laser shock peening (LSP), shot peening (SP), and combined LSP + SP on the fretting fatigue behavior of Ti–6Al–4V dovetail joints under different load levels. Multi-scale characterization reveals that all treatments generate gradient, heterogeneous grain structures and compressive residual stress (CRS), with LSP + SP producing the most significant surface CRS (673 MPa) and micro-hardness (377 HV0.3). Crucially, LSP + SP achieves the deepest grain refinement layer (420 μm), exceeding that of single SP or LSP (120 μm) by 3.5 times. Fretting fatigue tests reveal load dependent improvements: at higher loads (10 kN, 12 kN), LSP + SP yields the greatest life extension (7.08 and 4.57 times), while at lower loads (8 kN), SP offers the highest enhancement (8.71 times). Microstructural analysis indicates that LSP + SP transforms multi-crack initiation into single-source fracture and deepens crack origins from 70 μm to 663 μm, consistent with the refinement zone. Dense low angle grain boundaries (LAGBs) and dislocations near cracks slow early crack propagation. The enhanced fatigue performance results from the combined effects of microstructure and CRS, where surface CRS mainly influences crack initiation at low loads, whereas CRS penetration depth controls early crack growth at high loads. Overall, these findings show that LSP + SP effectively enhances damage tolerance by optimizing the interaction between subsurface stress and microstructure. |
| format | Article |
| id | doaj-art-da7c72059fda4e09bbe4aa3b052ebb20 |
| institution | DOAJ |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
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| spelling | doaj-art-da7c72059fda4e09bbe4aa3b052ebb202025-08-20T02:40:15ZengElsevierJournal of Materials Research and Technology2238-78542025-07-01373334334910.1016/j.jmrt.2025.07.015The mechanical coupling effect of laser shock and shot peening in Ti–6Al–4V dovetail joint: Residual stress, microstructure and fretting fatigue behaviorChen Wang0Xiong Zhang1Yan Yin2Weifeng He3Yibo Shang4Liucheng Zhou5Department of Basic Sciences, Air Force Engineering University, Xi'an, 710051, China; Department of Engineering Mechanics, Northwestern Polytechnical University, Dongxiang Lu 1, Xi'an, 710129, China; National Key Lab of Aerospace Power System and Plasma Technology, Air Force Engineering University, Xi'an, 710038, ChinaDivision of Structural Strength, AECC Sichuan Gas Turbine Establishment, Chengdu, 610500, ChinaDepartment of Mechanics, School of Urban Planning and Municipal Engineering of Basic Sciences, Xi'an Polytechnic University, Xi'an, 710048, China; Corresponding author.National Key Lab of Aerospace Power System and Plasma Technology, Air Force Engineering University, Xi'an, 710038, ChinaDepartment of Basic Sciences, Air Force Engineering University, Xi'an, 710051, China; National Key Lab of Aerospace Power System and Plasma Technology, Air Force Engineering University, Xi'an, 710038, China; Corresponding author. National Key Lab of Aerospace Power System and Plasma Technology, Air Force Engineering University, Xi'an, 710038, China.National Key Lab of Aerospace Power System and Plasma Technology, Air Force Engineering University, Xi'an, 710038, China; Corresponding author.This research systematically investigates the strengthening effects of laser shock peening (LSP), shot peening (SP), and combined LSP + SP on the fretting fatigue behavior of Ti–6Al–4V dovetail joints under different load levels. Multi-scale characterization reveals that all treatments generate gradient, heterogeneous grain structures and compressive residual stress (CRS), with LSP + SP producing the most significant surface CRS (673 MPa) and micro-hardness (377 HV0.3). Crucially, LSP + SP achieves the deepest grain refinement layer (420 μm), exceeding that of single SP or LSP (120 μm) by 3.5 times. Fretting fatigue tests reveal load dependent improvements: at higher loads (10 kN, 12 kN), LSP + SP yields the greatest life extension (7.08 and 4.57 times), while at lower loads (8 kN), SP offers the highest enhancement (8.71 times). Microstructural analysis indicates that LSP + SP transforms multi-crack initiation into single-source fracture and deepens crack origins from 70 μm to 663 μm, consistent with the refinement zone. Dense low angle grain boundaries (LAGBs) and dislocations near cracks slow early crack propagation. The enhanced fatigue performance results from the combined effects of microstructure and CRS, where surface CRS mainly influences crack initiation at low loads, whereas CRS penetration depth controls early crack growth at high loads. Overall, these findings show that LSP + SP effectively enhances damage tolerance by optimizing the interaction between subsurface stress and microstructure.http://www.sciencedirect.com/science/article/pii/S2238785425016734Fatigue mechanismsResidual stressMicrostructureFretting fatigueLaser shock peeningShot peening |
| spellingShingle | Chen Wang Xiong Zhang Yan Yin Weifeng He Yibo Shang Liucheng Zhou The mechanical coupling effect of laser shock and shot peening in Ti–6Al–4V dovetail joint: Residual stress, microstructure and fretting fatigue behavior Journal of Materials Research and Technology Fatigue mechanisms Residual stress Microstructure Fretting fatigue Laser shock peening Shot peening |
| title | The mechanical coupling effect of laser shock and shot peening in Ti–6Al–4V dovetail joint: Residual stress, microstructure and fretting fatigue behavior |
| title_full | The mechanical coupling effect of laser shock and shot peening in Ti–6Al–4V dovetail joint: Residual stress, microstructure and fretting fatigue behavior |
| title_fullStr | The mechanical coupling effect of laser shock and shot peening in Ti–6Al–4V dovetail joint: Residual stress, microstructure and fretting fatigue behavior |
| title_full_unstemmed | The mechanical coupling effect of laser shock and shot peening in Ti–6Al–4V dovetail joint: Residual stress, microstructure and fretting fatigue behavior |
| title_short | The mechanical coupling effect of laser shock and shot peening in Ti–6Al–4V dovetail joint: Residual stress, microstructure and fretting fatigue behavior |
| title_sort | mechanical coupling effect of laser shock and shot peening in ti 6al 4v dovetail joint residual stress microstructure and fretting fatigue behavior |
| topic | Fatigue mechanisms Residual stress Microstructure Fretting fatigue Laser shock peening Shot peening |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425016734 |
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