| SUN Yi-fan,HU Guo-jie,LIU Meng-jin,GAI Peng-tao,ZHOU Wen-long,CHEN Guo-qing,LI Zhi-qiang,FU Xue-song.Effect of Shot Peening on Fretting Fatigue Resistance of 2024 Aluminum Alloy/Titanium Alloy Riveted Joint[J],52(1):381-393 |
| Effect of Shot Peening on Fretting Fatigue Resistance of 2024 Aluminum Alloy/Titanium Alloy Riveted Joint |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.01.039 |
| KeyWord:mechanical shot peening 2024 aluminum alloy riveted joint fretting wear wear mechanism fatigue resistance |
| Author | Institution |
| SUN Yi-fan |
School of Materials Science and Engineering, Dalian University of Technology, Liaoning Dalian , China |
| HU Guo-jie |
School of Materials Science and Engineering, Dalian University of Technology, Liaoning Dalian , China |
| LIU Meng-jin |
School of Materials Science and Engineering, Dalian University of Technology, Liaoning Dalian , China |
| GAI Peng-tao |
National Key Laboratory of High Energy Beam Science and Technology, AVIC Manufacturing Technology Institute, Beijing , China |
| ZHOU Wen-long |
School of Materials Science and Engineering, Dalian University of Technology, Liaoning Dalian , China |
| CHEN Guo-qing |
School of Materials Science and Engineering, Dalian University of Technology, Liaoning Dalian , China |
| LI Zhi-qiang |
National Key Laboratory of High Energy Beam Science and Technology, AVIC Manufacturing Technology Institute, Beijing , China |
| FU Xue-song |
School of Materials Science and Engineering, Dalian University of Technology, Liaoning Dalian , China |
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| Abstract: |
| The work aims to study the effect of mechanical shot peening on fretting wear and fatigue life of 2024 aluminum alloy riveted joint (bolt made of titanium alloy). Fretting wear test of 2024 aluminum alloy was carried out by independently-designed fretting wear testing machine. A series of 2024 aluminum alloy samples after shot peening intensity gradient treatment were designed and compared with the original polished samples. To investigate the effect of mechanical shot peening on fretting wear resistance of 2024 aluminum alloy samples in line/surface contact form, X-ray diffractometer, Vickers hardness tester, LSCM and SEM were used to analyze the surface integrity, surface morphology, contour and wear volume of the samples before and after mechanical shot peening. Average fatigue life of riveted joint was significantly improved by mechanical shot peening, which was 36.3 times higher than that of the original joint. Fracture failure analysis found that fatigue crack source location changed after shot peening, the crack source of original joint was located in the surface of the riveted hole edges (junction between panel and hole location). After shot peening (only riveted panel surface subject to shot peening treatment), crack source of panel surface transferred to the surface of the riveted hole wall. After shot peening to panel surface + hole surface + graphite lubricant spraying, crack source of sample transferred to the riveted hole sub-surface (best reinforcement effect). The failure fracture of the original riveted joint was found at about 30 degree angle of the round hole in the upper panel, and the failure fracture of the riveted joint after mechanical shot peening was found at about 90 degree angle of the round hole in the lower panel. The depth of the original sample was 41.5 μm during the online/surface micro-friction test. At 0.2A-200%, the wear depth was reduced to 34.6 μm, and the wear resistance was improved. At 0.3A-200%, the wear depth increased to 58.9 μm, and the wear resistance decreased. The effect of mechanical shot peening on the fretting wear resistance of aluminum alloy fluctuated with the change of shot peening process parameters, and the sample treated with 0.2A-200% shot peening strength had the best fretting wear resistance of line/surface contact compared with the sample not treated by shot peening. Compared with the original sample, the micro-friction coefficient of aluminum alloy after shot peening decreased, and the friction entered the stable stage earlier after shot peening. With the increase of shot peening strength from 0.2A to 0.3A, the surface roughness, surface microhardness and residual compressive stress increased. With the increase of shot peening coverage from 200% to 400%, the surface roughness and surface microhardness increased, while the residual compressive stress decreased. With the increase of shot peening strength from 0.2A to 0.3A, the depth of residual compressive stress layer increased from 250 μm to 300 μm. After shot peening, the fretting wear mechanism of aluminum alloy changed from adhesion wear to delamination wear. Through EBSD study, it was found that shot peening increased the proportion of small angle grain boundary in the sample surface layer and refined the grain surface layer. The effect of residual compressive stress field and work hardening layer on the fretting fatigue resistance of riveted joint is attributed to the joint effect of shot peening on the material surface. |
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