Abstract
In this study, continuous wave (CW) and pulsed wave (PW) lasers (pulse frequencies of 5, 50, and 500 Hz) were used to weld TC4 alloy joints, and the microstructure and corrosion behaviours of the FZ were studied. The results showed that the PW played a role in refining the prior β grains, with the best grain refinement achieved at a pulse frequency of 50 Hz. The main factors affecting the corrosion resistance are the grain size and KAM values. A mathematical model was established to investigate the effect of grain size/KAM value and pulse frequency on the corrosion resistance.
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