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Effect of welding heat input and post-welded heat treatment on hardness of stir zone for friction stir-welded 2024-T3 aluminum alloy

Journal Article


Abstract


  • The microstructure and hardness of the stir zone (SZ) with different welding heat inputs were investigated for friction stir-welded 2024-T3 aluminum by transmission electron microscopy, differential scanning calorimeter and Vickers micro-hardness test. The results show that welding heat input has a significant effect on the hardness of the SZ. Under high welding heat input condition, a higher welding speed is beneficial for improving the hardness of the SZ. However, when the welding heat input is low, the hardness of the SZ elevates with increasing the rotation speed. The hardness of the SZ decreases after post-welded heat treatment due to overaging. The joints welded at 500 r/min and 100 mm/min show a high resistance to overaging. The reduction of hardness in the SZ is only 3.8%, while in other joints, the reduction is more than 10%. The morphology of strengthening precipitates plays important roles for the improvement of hardness.

Authors


  •   Chen, Yu (external author)
  •   Ding, Hua (external author)
  •   Li, Ji Zhong (external author)
  •   Zhao, Jingwei
  •   Fu, Ming Jie (external author)
  •   Li, Xiao Hua (external author)

Publication Date


  • 2015

Citation


  • Chen, Y., Ding, H., Li, J., Zhao, J., Fu, M. & Li, X. (2015). Effect of welding heat input and post-welded heat treatment on hardness of stir zone for friction stir-welded 2024-T3 aluminum alloy. Nonferrous Metals Society of China Transactions, 25 (8), 2524-2532.

Scopus Eid


  • 2-s2.0-84939435061

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4287

Number Of Pages


  • 8

Start Page


  • 2524

End Page


  • 2532

Volume


  • 25

Issue


  • 8

Abstract


  • The microstructure and hardness of the stir zone (SZ) with different welding heat inputs were investigated for friction stir-welded 2024-T3 aluminum by transmission electron microscopy, differential scanning calorimeter and Vickers micro-hardness test. The results show that welding heat input has a significant effect on the hardness of the SZ. Under high welding heat input condition, a higher welding speed is beneficial for improving the hardness of the SZ. However, when the welding heat input is low, the hardness of the SZ elevates with increasing the rotation speed. The hardness of the SZ decreases after post-welded heat treatment due to overaging. The joints welded at 500 r/min and 100 mm/min show a high resistance to overaging. The reduction of hardness in the SZ is only 3.8%, while in other joints, the reduction is more than 10%. The morphology of strengthening precipitates plays important roles for the improvement of hardness.

Authors


  •   Chen, Yu (external author)
  •   Ding, Hua (external author)
  •   Li, Ji Zhong (external author)
  •   Zhao, Jingwei
  •   Fu, Ming Jie (external author)
  •   Li, Xiao Hua (external author)

Publication Date


  • 2015

Citation


  • Chen, Y., Ding, H., Li, J., Zhao, J., Fu, M. & Li, X. (2015). Effect of welding heat input and post-welded heat treatment on hardness of stir zone for friction stir-welded 2024-T3 aluminum alloy. Nonferrous Metals Society of China Transactions, 25 (8), 2524-2532.

Scopus Eid


  • 2-s2.0-84939435061

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4287

Number Of Pages


  • 8

Start Page


  • 2524

End Page


  • 2532

Volume


  • 25

Issue


  • 8