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Fatigue crack propagation of 7050 aluminum alloy FSW joints after surface peening

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【Author】 Jin Yuhua;Chen Yongsheng;Ma Yueming;Wang Xijing;Guo Tingbiao;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,School of Materials Scienceand Engineering,Lanzhou University of Technology;School of Materials Science and Engineering,Lanzhou University of Technology;

【通讯作者】金玉花;

【机构】 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,School of Materials Scienceand Engineering,Lanzhou University of Technology； School of Materials Science and Engineering,Lanzhou University of Technology；

【摘要】 The surface composite modification of the 7 050 aluminum alloy friction stir-welded joints was performed by shot peening(SP)/multiple rotation rolling(MRR) and MRR/SP,and the fatigue performance of the nugget zone(NZ) was investigated.The results demonstrated that the fatigue life of SP/MRR samples is longer than that of MRR/SP.On the plane 150 μm below the surface.The grains with high angle grain boundary account for 71.5% and 34.3% for MRR/SP and SP/MRR samples,respectively.The crack propagation path of the MRR/SP is transgranular and intergranular,and it is intergranular for the MRR/SP.Multitudinous fatigue striations and some voids appeared at the fracture during the stable crack propagation stage.However,fatigue striations for SP/MRR are with smaller spacing,fewer holes,and smaller size under SP/MRR compared with fatigue fracture of MRR/SP.The differences in fatigue properties and fracture characteristics of the NZ are related to the microstructure after the two combined surface modifications.更多还原

【Abstract】 The surface composite modification of the 7 050 aluminum alloy friction stir-welded joints was performed by shot peening(SP)/multiple rotation rolling(MRR) and MRR/SP,and the fatigue performance of the nugget zone(NZ) was investigated.The results demonstrated that the fatigue life of SP/MRR samples is longer than that of MRR/SP.On the plane 150 μm below the surface.The grains with high angle grain boundary account for 71.5% and 34.3% for MRR/SP and SP/MRR samples,respectively.The crack propagation path of the MRR/SP is transgranular and intergranular,and it is intergranular for the MRR/SP.Multitudinous fatigue striations and some voids appeared at the fracture during the stable crack propagation stage.However,fatigue striations for SP/MRR are with smaller spacing,fewer holes,and smaller size under SP/MRR compared with fatigue fracture of MRR/SP.The differences in fatigue properties and fracture characteristics of the NZ are related to the microstructure after the two combined surface modifications.更多还原

【关键词】 7050 aluminum alloy； surface compound modification； fatigue crack propagation； weld nugget zone；
【Key words】 7050 aluminum alloy； surface compound modification； fatigue crack propagation； weld nugget zone；

【基金】 supported by the National Natural Science Foundation of China (Grants 51865028);the Gansu Provincial Science and Technology Planning Project(Grant No.20YF8GA056)

【文献出处】 China Welding ,中国焊接(英文版) , 编辑部邮箱 ,2023年01期

【分类号】TG453.9
【下载频次】7

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