Modeling of AA5083 Material-Microstructure Evolution During Butt Friction-Stir Welding
CLEMSON UNIV SC DEPT OF MECHANICAL ENGINEERING
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A concise yet a fairly comprehensive overview of the friction stir welding FSW process is provided. This is followed by a computational investigation in which FSW behavior of a prototypical solution-strengthened and strain-hardened aluminum alloy, AA5083-H131, is modeled using a fully coupled thermo-mechanical finite-element procedure developed in our prior study. Particular attention is given to proper modeling of the welding work-piece material behavior during the FSW process. Specifically, competition and interactions between plastic-deformation and dynamic-recrystallization processes are considered to properly account for the material-microstructure evolution in the weld nugget zone. The results showed that with proper modeling of the material behavior under high-temperaturesevere-plastic-deformation conditions, significantly improved agreement can be attained between the computed and measured post-FSW residual stress and material-strength distribution results.
- Metallurgy and Metallography
- Fabrication Metallurgy