Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (11): 2542-2548.doi: 10.13229/j.cnki.jdxbgxb20210333

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Effect of ultrasonic impact on fatigue performance of friction stir weld

Lei WANG1(),Bing-han HUANG2,Jia-hui CONG2,3,Li HUI3,Song ZHOU2,3,Yong-zhen XU2   

  1. 1.College of Mechanical Engineering，Suzhou University of Science and Technology，Suzhou 215000，China
    2.School of Mechatronics Egineering，Shenyang Aerospace University，Shenyang 110136，China
    3.Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process，Shenyang Aerospace University，Shenyang 110136，China
  • Received:2021-03-12 Online:2022-11-01 Published:2022-11-16

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Abstract:

Ultrasonic impact is used to process the welding seam of aluminum alloy 2024-T4 friction stir welding. The residual stress， microstructure， microhardness and fatigue performance of the specimens before and after ultrasonic impact were compared and analyzed. The results show， after ultrasonic impact treatment， residual compressive stress is introduced into the surface of the specimen， and the average residual compressive stress can reach 263 MPa. The surface structure of the sample is refined after ultrasonic impact treatment， the depth of the deformation layer can reach 50~70 μm， and the surface hardness is increased from 175 HV to 235 HV. The fatigue life of the specimens treated by ultrasonic impact are significantly improved. The fatigue life of the ultrasonic impact specimens are 1.72~2 times that of the unimpacted specimens， and the location of fatigue crack initiation is transferred from the surface to the subsurface below the strengthening layer.

Key words: mechanical engineering, aluminum alloy, friction stir welding, ultrasonic impact, fatigue performance

CLC Number: 

  • TG405

Table 1

Chemical composition of 2024 aluminum alloy"

元素质量分数/%
Si0.5
Fe0.5
Cu3.8~4.9
Mg1.2~1.8
Zn0.3
Ti0.15
Mn0.3~0.9
其他Ni：0.1， Fe+Ni：0.5
Al余量

Fig.1

Schematic diagram of fatigue specimen"

Fig.2

Schematic diagram of specimens cross section hardness test"

Fig.3

Schematic diagram of the hardness test along the depth of ultrasonic impact treatment specimen"

Fig.4

Surface residual stress distribution"

Fig.5

Schematic diagram of ultrasonic impact changing the surface structure of the material"

Fig.6

Microstructure of sample after ultrasonic impact"

Fig.7

Comparison of hardness before and after ultrasonic impact treatment"

Fig.8

Ultrasonic impact treatment sample hardness test along the depth direction"

Fig.9

Fatigue life of welded joints before and after ultrasonic impact treatment"

Fig.10

Fatigue fracture of untreated specimen"

Fig.11

Fatigue fracture of ultrasonic impact specimen"

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