Abstract
This work mainly focuses on a series of microstructural analysis and predictions regarding dynamic recrystallization behavior, change in grain size, and dislocation density. Additionally, this study includes the shape prediction of the stir zone formed during friction stir spot welding. Microstructure analysis of the joint reveals that the mechanism of dynamic recrystallization in the stir zone is geometric dynamic recrystallization. A set of constitutive equations based on dislocation density is established and implemented in DEFORM-3D software to predict dynamic recrystallization during friction stir spot welding of AA6082. From the experimental and model predictions, it is observed that the original microstructure in the stir zone is completely replaced by a recrystallized fine grained microstructure. There is satisfactory agreement between the experimental grain size and the simulated results. In addition, the predicted shape of the stir zone fits quite well with the experimental shape as well.
Highlights
Lightweight structures have attracted increasing attention in the automobile and aerospace industries to enhance performance efficiency as well as to reduce environmental impact [1,2,3].More weight saving material such as aluminum alloy is utilized instead of steel in vehicle design.Resistance spot welding is the most frequently used process in vehicle body assembly
The final Friction stir spot welding (FSSW) joint consists of four typical zones: stir thermo-mechanically affected zone (TMAZ), heat affected zone (HAZ) and base material (BM)
The microstructure evolution of AA6082 alloy in FSSW joint is analyzed by using light light microscopy and EBSD
Summary
Lightweight structures have attracted increasing attention in the automobile and aerospace industries to enhance performance efficiency as well as to reduce environmental impact [1,2,3]. In the dwell stage as shown, the tool penetrates metals and tool shoulder contacts with upper plate, which generates more heat and plastic flow. In the dwell stage as shown, the tool penetrates metals and tool shoulder contacts with upper plate, which generates more heat and the weld zones are developed in plates around the tool. The final FSSW joint consists of four typical zones: stir thermo-mechanically affected zone (TMAZ), heat affected zone (HAZ) and base material (BM). Zone (SZ), thermo-mechanically affected zone (TMAZ), heat affected zone (HAZ) and base material understanding of these stages is very crucial as the thermal and material flow fields generated in the (BM) Understanding of these stages is very crucial as the thermal and material flow fields process would dictate the final microstructure and weld quality.
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