Abstract
During the laser welding of Ti-6Al-4V titanium alloy, the formed microstructure during the solidification process of molten pool is highly related to comprehensive properties of welded joints. A macro–micro coupling model is developed in this paper for solidification process of molten pool by considering transient flow field to investigate the evolution process of microstructure morphology and solute distribution in laser welding of Ti-6Al-4V titanium alloy. Based on the model, the evolution process of microstructure during solidification process of molten pool is calculated and the formed microstructure morphology in the region of molten pool is obtained. Simultaneously, the solute distribution in the different positions of molten pool under the effect of transient flow field at different times is analyzed and discussed in details. The calculated results are found in good agreement with the experimental results, which confirms the validity of the developed macro–micro coupling model for the laser welding of Ti-6Al-4V titanium alloy. Therefore, the proposed method is efficient for improving microstructure performance of welded joints of Ti-6Al-4V titanium alloy laser welding.
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