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The effect of the friction stir welding processing (FSP) speed rotation and feed rate on the microstructure of a Ti–6Al–4V alloy was investigated in a 2-mm-thick alloy. The joints were processed above the β-transus temperature. The prior β-grain size in the stir zone depended on the speed rotation that is related with the peak temperature and the size of the lamellar structure depended on the feed that control the cooling rate. Some regions with bimodal refined grains structure were observed on stir zone. A hardness increase on friction stir processed region was observed in all conditions, except for 1550 RPM and feed 50 mm/min. It was associated to a coarse lamellar structure.
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Santos et al. (2015) studied this question.
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