旋片喷丸对7150铝合金剥蚀的影响

jiwenlong · 发表于 2013-4-15 20:23:00

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旋片喷丸对7150 铝合金剥蚀的影响
刘朝妮1 黄昌龙2 刘中华1 徐海蓉2
( 1．上海飞机设计研究院，上海200232; 2．广州民航职业技术学院，广东广州510403)
［关键词］剥蚀; 旋片喷丸; 喷丸强度; 喷丸覆盖率; 晶粒纵厚比; 压应力
［摘要］根据不同喷丸强度和覆盖率处理后波音737 飞机龙骨梁下缘条ADF 天线固定孔打磨修理区域剥蚀规律以及通过
扫描电子显微镜获得的材料晶粒形状，研究了旋片喷丸工艺对7150 合金剥蚀行为的影响。结果表明: 喷丸强度一定时，剥蚀
的形成和扩展速度随覆盖率升高而降低; 喷丸覆盖率一定时，剥蚀的形成和扩展速度随喷丸强度升高而加快; 晶粒纵厚比越
大，7150 铝合金剥蚀的形成和扩展速度越快; 压应力可加速7150 铝合金剥蚀的形成和扩展; 在允许喷丸强度范围内，低喷丸
强度、高覆盖率喷丸工艺，可以有效预防和控制飞机龙骨梁下缘条打磨修理区域受剥蚀。
［中图分类号］ TG 174． 3 ［文献标志码］ A ［文章编号］1001－4926( 2012) 02－0080－05
The Effect of Flap Peen on the Exfoliation Corrosion of 7150 Alloy
LIU Zhao－ni1 HUANG Chang－long2 LIU Zhong－hua1 XU Hai－rong2
( 1． Shanghai Aircraft Design and Research Institute，Shanghai 200232，China;
2． Guangzhou Civil Aviation College，Guangzhou，Guangdong 510403，China)
Key words: EFC; flap peen; intensity; coverage; grain aspect ratio; compression stress
Abstract: The effects of flap peen on the exfoliation fracture corrosion ( EFC) of 7150 alloy had been investigated based on the EFC
laws in the blended area of Boeing 737 keel beam lower chord by means of flap peen with different intensity and coverage and the grain
aspect observed by SEM． The results show that EFC can be reduced by increasing the coverage or decreasing the intensity． Low grain
aspect ratio and compression stress can retard EFC． Within the allowable intensity of flap peen，the process of low intensity and high
coverage is an effective process to control and prevent EFC in the blended area of the keel beam lower chord．