Abstract
To improve the formability of the aluminum alloy welds and overcome the size limitation of the bulk post weld heat treatment (BPWHT) on large size friction stir welded joints, a local post weld heat treatment method (LPWHT) was proposed. In this method, the resistance heating as the moving heat source is adopted to only heat the weld seam. The temperature field of LPWHT and its influence on the mechanical properties and formability of FSW 2219-O Al alloy joints was investigated. The evaluation of the tensile properties of FSW samples was also examined by mapping the global and local strain distribution using the digital image correlation methodology. The results indicated that the formability was improved greatly after LPWHT, while the hardness distribution of the FSW joint was homogenized. The maximum elongation can reach 1.4 times that of as-welded joints with increase the strength and the strain of the nugget zone increased from 3 to 8% when annealing at 300 °C. The heterogeneity on the tensile deformation of the as-welded joints was improved by the nugget zone showing large local strain value and the reason was given according to the dimple fracture characteristics at different annealing temperatures. The tensile strength and elongation of LPWHT can reach 93.3 and 96.1% of the BPWHT, respectively. Thus, the LPWHT can be advantageous compared to the BPWHT for large size welds.
Similar content being viewed by others
References
A. Heinz, A. Haszler, C. Keidel, S. Moldenhauer, R. Benedictus, and W.S. Miller, Recent Development in Aluminum Alloys for Aerospace Applications, Mater. Sci. Eng. A, 2000, 280(1), p 102–107
Z.L. Hu, X.S. Wang, Q. Pang, F. Huang, X.P. Qin, and S.J. Yuan, Experimental and Numerical Study on Hydroforming Characteristics of Friction Stir Welded Aluminum Alloy Tubes, Int. J. Adv. Manuf. Technol., 2015, 80(5), p 959–969
H.J. Liu and X.L. Feng, Effect of Post-processing Heat Treatment on Microstructure and Microhardness of Water-Submerged Friction Stir Processed 2219-t6 Aluminum Alloy, Mater. Des., 2013, 47(9), p 101–105
C. Genevois, A. Deschamps, A. Denquin, and B. Doisneau-Cottignies, Quantitative Investigation of Precipitation and Mechanical Behaviour for AA2024 Friction Stir Welds, Acta Mater., 2005, 53(8), p 2447–2458
R.S. Mishra and Z.Y. Ma, Friction Stir Welding and Processing, Mater. Sci. Eng. R, 2005, 50(1), p 13–58
R. Nandan, T. DebRoy, and H.K.D.H. Bhadeshia, Recent Advances in Friction-Stir Welding-Process, Weldment Structure and Properties, Prog. Mater Sci., 2008, 53(6), p 980–1023
A. Simar, Y. Bréchet, B.D. Meester, A. Denquin, C. Gallais, and T. Pardoen, Integrated Modeling of Friction Stir Welding of 6xxx Series Al Alloys: Process, Microstructure and Properties, Prog. Mater Sci., 2012, 57(1), p 95–183
A. Sullivan and J.D. Robson, Microstructural Properties of Friction Stir Welded and Post-weld Heat-Treated 7449 Aluminum Alloy Thick Plate, Mater. Sci. Eng. A, 2008, 478(1–2), p 351–360
M. Peel, A. Steuwer, M. Preuss, and P.J. Withers, Microstructure, Mechanical Properties and Residual Stresses as a Function of Welding Speed in Aluminium AA5083 Friction Stir Welds, Acta Mater., 2003, 51(16), p 4791–4801
D.A. Wang and S.C. Lee, Microstructures and Failure Mechanisms of Friction Stir Spot Welds of Aluminum 6061-t6 Sheets, J. Mater. Process. Technol., 2007, 186(1–3), p 291–297
C. Sharma, D.K. Dwivedi, and P. Kumar, Effect of Welding Parameters on Microstructure and Mechanical Properties of Friction Stir Welded Joints of AA7039 Aluminum Alloy, Mater. Des., 2012, 36, p 379–390
G. İpekoğlu, S. Erim, and G. Çam, Investigation into the Influence of Post-weld Heat Treatment on the Friction Stir Welded aa6061 Al-Alloy Plates with Different Temper Conditions, Metall. Mater. Trans. A, 2014, 45(2), p 864–877
G. İpekoğlu, S. Erim, and G. Çam, Effects of Temper Condition and Post Weld Heat Treatment on the Microstructure and Mechanical Properties of Friction Stir Butt-Welded AA7075 Al Alloy Plates, Int. J. Adv. Manuf. Technol., 2014, 70(1–4), p 201–213
Y.C. Chen, H.J. Liu, and J.C. Feng, Effect of Post-weld Heat Treatment on the Mechanical Properties of 2219-O Friction Stir Welded Joints, J. Mater. Sci., 2005, 41(17), p 297–299
J.C. Feng, Y.C. Chen, and H.J. Liu, Effects of Post-weld Heat Treatment on Microstructure and Mechanical Properties of Friction Stir Welded Joints of 2219-O Aluminium Alloy, Mater. Sci. Technol., 2006, 43(1), p 134–143
S.M. Bayazid, H. Farhangi, H. Asgharzadeh, L. Radan, A. Ghahramani, and A. Mirhaji, Effect of Cyclic Solution Treatment on Microstructure and Mechanical Properties of Friction Stir Welded 7075 Al Alloy, Mater. Sci. Eng. A, 2015, 649, p 293–300
Z.L. Hu, S.J. Yuan, X.S. Wang, G. Liu, and Y. Huang, Effect of Post-weld Heat Treatment on the Microstructure and Plastic Deformation Behavior of Friction Stir Welded 2024, Mater. Des., 2011, 32(10), p 5055–5060
S.J. Yuan, Z.L. Hu, and X.S. Wang, Formability and Microstructural Stability of Friction Stir Welded Al Alloy Tube During Subsequent Spinning and Post Weld Heat Treatment, Mater. Sci. Eng. A, 2012, 558(48), p 586–591
G.N. Chu, Y.L. Lin, and G. Chen, A Green Line Heating Forming Technology for Ultra-Thick Plate, Int. J. Adv. Manuf. Technol., 2016, 87(5–8), p 1977–1984
Acknowledgments
This study was supported by the National Natural Science Foundation of China (Grant Nos. 51475121 and 51405102). The authors would like to express their sincere appreciation to these funding organizations.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Chu, G., Sun, L., Lin, C. et al. Effect of Local Post Weld Heat Treatment on Tensile Properties in Friction Stir Welded 2219-O Al Alloy. J. of Materi Eng and Perform 26, 5425–5431 (2017). https://doi.org/10.1007/s11665-017-2998-7
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11665-017-2998-7