表面技术2016，Vol.45Issue(1)：118-123,6.DOI:10.16490/j.cnki.issn.1001-3660.2016.01.019
喷丸对预腐蚀后铝合金疲劳性能的影响
Effects on Anti-corrosion Fatigue Property of Aluminum Alloy after Shot Peening
摘要
Abstract
Objective To analyze the influence of shot peening on fatigue performance of aluminum alloy components with corro-sion damage so as to guide the repair of aircraft components. Methods The 7075 aluminum alloy samples with three types of differ-ent surface states, which were treated with un-shot peening, shot peening on three surfaces and shot peening for twice on three sur-faces, were selected as the research subjects. The corrosion damage of two different degrees was obtained by changing the corrosion parameters such as NaCl concentration, temperature and time, and the fatigue property of aluminum alloy on shot peening surface state was analyzed according to fatigue life, fracture location and fracture morphology of aluminum alloy. Results At a mild corro-sion damage, the fatigue life of shot peening on three surface was 7. 84 times longer than that of un-shot peening, and the fatigue life would be further improved by 1. 62 times if the eroded sample after shot peening was peened again;the fracture position of un-shot peening sample was located in the abruptly changed area of cross section, and the fracture position of the other two types of shot peened samples was in the front of clip. According to observation of the fracture morphology, fatigue crack of un-shot peening samples showed that on the edge of the fracture surface, the central regions of shot peened sample formed a smooth and straight sta-ble-extended area. At a serious corrosion damage, shot peening processing still could improve the fatigue life of aluminum alloy, but the fatigue life gap would be reduced on three kinds of different surface samples. According to observation of the fracture posi-tion and the fracture morphology, the gap was also narrowed between three kinds of samples. Conclusion The fatigue performance would be improved obviously, if the aluminum alloy corrosion damage components were shot peened before pre-corrosion treat-ments;and the fatigue performance of materials would be further improved, if the eroded sample after shot peening were peened again; besides, the stress concentration would be weaken on the abruptly changed area of cross-section, and production and growth of fatigue crack would be restrained on the component surface when the aluminum alloy component was shot peened.关键词
喷丸/预腐蚀/铝合金/疲劳性能/航空构件/断裂位置Key words
shot peening/pre-corrosion/aluminum alloy/fatigue property/aircraft component/fracture location分类
矿业与冶金引用本文复制引用
邓红华,夏琴香,程秀全,任艳萍..喷丸对预腐蚀后铝合金疲劳性能的影响[J].表面技术,2016,45(1):118-123,6.基金项目
国家自然科学基金资助项目(51575117) （51575117）
国家自然科学基金(民航联合基金)资助项目(61179051) Fund: Supported by the National Natural Science Foundation of China (51575117) and Joint Fund between NSFC and the Civil Aviation Administration of China (61179051) （民航联合基金）
