Abstract: Laser cladding is an emerging surface strengthening technology, which has the characteristics of high process accuracy, good controllability, fine structure, and small thermal distortion. It is widely used in the fields of automobiles, energy, electronics, aerospace and other fields. The micro-cracks, pores and other micro-defects that appeared in the laser cladding process seriously affected the promotion of this technology. Ultrasonic vibration uses high-frequency and low-amplitude vibration, which can affect the cladding and solidification microstructure and effectively reduce microscopic defects. Based on the phase field method, a dynamic model of the laser cladding bath solidification process of a disc laser under ultrasonic vibration was established, and the model was solved by programming, revealing the polycrystalline solidification structure under different amplitudes, and at the same time, the cladding solidification behavior was experimentally characterized. The two conclusions are in good agreement. Studies have shown that ultrasonic vibration can effectively refine the structure of the cladding layer, promote crystal solidification and nucleation, and change the preferred orientation of dendrites. Vibration does not affect the growth rate of the main dendrite arm, but has obvious effects on the width of the main dendrite arm, the formation of the secondary dendrite arm, the growth rate and the competitive growth. With the increase of ultrasonic amplitude, the secondary and tertiary dendrite arms tend to flourish, and the competitive growth is obvious, which indirectly reduces the formation of pores and cracks in the solidified structure. Excessive ultrasonic amplitude will not further change the dendrite morphology. This research provides theoretical guidance for the practical application of laser cladding under ultrasonic vibration, and provides an important theoretical basis for precise control of the solidification structure.
高敬翔, 李昌, 陈正威, 韩兴. 基于相场法的超声振动对激光熔覆多晶凝固行为的影响[J]. 材料导报, 2021, 35(12): 12161-12168.
GAO Jingxiang, LI Chang, CHEN Zhengwei, HAN Xing. Effect of Ultrasonic Vibration on the Solidification Behavior of Laser Cladding Polycrystalline Based on Phase Field Method. Materials Reports, 2021, 35(12): 12161-12168.
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2021, Vol. 35 
