吉林大学学报(工学版) ›› 2022, Vol. 52 ›› Issue (11): 2542-2548.doi: 10.13229/j.cnki.jdxbgxb20210333

• 材料科学与工程 • 上一篇    

超声冲击对搅拌摩擦焊缝疲劳性能的影响

王磊1(),黄秉汉2,丛家慧2,3,回丽3,周松2,3,徐永臻2   

  1. 1.苏州科技大学 机械工程学院，江苏 苏州 215000
    2.沈阳航空航天大学 机电工程学院，沈阳 110136
    3.沈阳航空航天大学 航空制造工艺数字化国防重点学科实验室，沈阳 110136
  • 收稿日期:2021-03-12 出版日期:2022-11-01 发布日期:2022-11-16
  • 作者简介:王磊（1981-），男，教授，博士. 研究方向：航空材料及焊接结构强度评定，损伤修复与寿命分析.E-mail： leiwang@sau.edu.cn
  • 基金资助:
    国家自然科学基金项目(51775355);辽宁省百千万人才资助项目(2020-78-B46)

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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摘要：

采用超声冲击对铝合金2024-T4搅拌摩擦焊焊缝进行处理，对冲击前后试样进行残余应力、微观组织、显微硬度和疲劳性能的对比分析。结果表明：超声冲击处理之后，试样的表面引入残余压应力，平均残余压应力可达263 MPa；试样经过超声冲击处理表层组织得到细化，变形层深度可达50~70 μm，表面硬度由175 HV提升到235 HV；超声冲击处理的试样疲劳寿命明显提高，超声冲击试样是未冲击试样疲劳寿命的1.72~2倍，疲劳裂纹萌生的位置由表面转移至强化层以下的亚表面。

关键词: 机械工程, 铝合金, 搅拌摩擦焊, 超声冲击, 疲劳性能

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

中图分类号: 

  • TG405

表1

2024铝合金的化学成分"

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

图1

疲劳试样示意图"

图2

试样截面硬度测试示意图"

图3

超声冲击处理试样沿深度硬度测试示意图"

图4

表面残余应力分布图"

图5

超声冲击改变材料表层结构示意图"

图6

超声冲击后试样显微组织"

图7

超声冲击处理前、后硬度对比"

图8

超声冲击处理试样沿深度方向硬度测试"

图9

超声冲击处理前、后焊接接头疲劳寿命"

图10

未处理试样疲劳断口"

图11

超声冲击试样疲劳断口"

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