Calculations of Microstructural Changes and Predictions of Mechanical Properties in Friction Stir Welding of AA6005-T6

doi:10.3901/JME.2018.08.129

Abstract

Abstract: Based on the microstructural evolution rules on Al-Mg-Si alloy in isothermal and non-isothermal conditions, the precipitation evolution model is established. The nucleation, solid solution and the coarsening are comprehensively included in the established model. With combination of the adaptive-remeshing thermal-mechanical coupling FEM in numerical simulation of friction stir welding of 6005-T6, the microstructural evolution and the strengthening model of AA6005-T6 in friction stir welding is further established. With consideration of the solid solution strengthening and the precipitation strengthening, the evolutions of the second phase and the variations of the mechanical properties in friction stir welding of AA6005-T6 can be predicted. The comparison with the experimental data can validate the proposed models. By calculating the artificial ageing after welding process, a result can be clearly concluded. The soft region can be found in stirring zone area in as-welded condition, whereas the soft one lies in the heat affected zone after artificial ageing because of the reason that the re-precipitation occurs in the stirring zone.

Key words: friction stir welding, mechanical property prediction, microstructure evolution, precipitation

CLC Number:

TG402

WAN Zhenyu, ZHOU Xia, ZHANG Zhao. Calculations of Microstructural Changes and Predictions of Mechanical Properties in Friction Stir Welding of AA6005-T6[J]. Journal of Mechanical Engineering, 2018, 54(8): 129-136.

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