孙一帆,胡国杰,刘梦金,盖鹏涛,周文龙,陈国清,李志强,付雪松.喷丸强化对2024铝合金/钛合金铆接件微动疲劳性能的影响[J].表面技术,2023,52(1):381-393.
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].Surface Technology,2023,52(1):381-393 |
| 喷丸强化对2024铝合金/钛合金铆接件微动疲劳性能的影响 |
| 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 |
| 中文关键词: 机械喷丸强化 2024铝合金 铆接件 微动磨损 磨损机制 疲劳性能 |
| 英文关键词:mechanical shot peening 2024 aluminum alloy riveted joint fretting wear wear mechanism fatigue resistance |
| 基金项目:国家自然科学基金(51975084，51405059);航空科学基金(20185425009，201936025001);中央高校基本科研业务费专项资金(DUT19LAB16) |
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| Author | Institution |
| SUN Yi-fan | School of Materials Science and Engineering, Dalian University of Technology, Liaoning Dalian 116024, China |
| HU Guo-jie | School of Materials Science and Engineering, Dalian University of Technology, Liaoning Dalian 116024, China |
| LIU Meng-jin | School of Materials Science and Engineering, Dalian University of Technology, Liaoning Dalian 116024, China |
| GAI Peng-tao | National Key Laboratory of High Energy Beam Science and Technology, AVIC Manufacturing Technology Institute, Beijing 100024, China |
| ZHOU Wen-long | School of Materials Science and Engineering, Dalian University of Technology, Liaoning Dalian 116024, China |
| CHEN Guo-qing | School of Materials Science and Engineering, Dalian University of Technology, Liaoning Dalian 116024, China |
| LI Zhi-qiang | National Key Laboratory of High Energy Beam Science and Technology, AVIC Manufacturing Technology Institute, Beijing 100024, China |
| FU Xue-song | School of Materials Science and Engineering, Dalian University of Technology, Liaoning Dalian 116024, China |
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| 中文摘要: |
| 目的 研究机械喷丸强化对2024铝合金铆接件(螺栓为钛合金)微动磨损及疲劳寿命的影响。方法 利用X射线衍射仪、维氏硬度计、激光共聚焦显微镜和扫描电镜等设备，分析机械喷丸前后试样的表面完整性、磨痕表面形貌、磨痕轮廓和磨损体积。结果 采用机械喷丸强化处理能够显著提升铆接件的平均疲劳寿命，相较于原始试样，最高提升了约36.3倍。经断口失效分析发现，喷丸强化后试样的疲劳裂纹源位置发生了转移，原始件裂纹源位于铆接孔棱角的表面(板面与孔交界位置)，板面喷丸后(只对铆接板表面进行喷丸处理)试样的裂纹源转向铆接孔壁的表面，板面+孔面+石墨润滑喷丸后试样的裂纹源转向铆接孔次表面(强化效果最好)。机械喷丸强化对铝合金微动耐磨性能的影响随着喷丸工艺参数的变化而波动。在线/面微动摩擦测试中，原始样品的磨痕深度为41.5 μm;采用0.2A的喷丸强度、200%的覆盖率(记为0.2A−200%)的喷丸参数时，磨痕深度降至34.6 μm，耐磨性得到提高;在0.3A的喷丸强度、200%的覆盖率(记为0.3A−200%)的喷丸参数时，磨痕深度升至58.9 μm，耐磨性降低。经喷丸强化后铝合金的微动磨损机制由黏着磨损向脱层磨损转变。通过电子背散射衍射研究发现，喷丸处理使得样品表层小角度晶界所占比例增多，表层晶粒细化。结论 铆接件微动疲劳性能的强化效果得益于喷丸在材料表面引入的残余压应力场和加工硬化层的共同作用。 |
| 英文摘要: |
| 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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