通过数值模拟与实验相结合的方法，研究超声场对激光熔凝过程中熔池温度场、流场以及熔池形貌的影响。建立描述超声振动辅助激光熔凝过程中的声场和温度场的三维数学模型，通过有限体积法实现激光熔池中声场和温度场的耦合模拟分析，系统分析激光熔池内声场、温度场、流场的变化规律。结果表明: 在超声场作用下的熔池温度略低于未施加超声场的熔池温度；流动速度增加72%，但并未改变未加超声时熔池内Marangoni流的环流趋势；在超声场作用下的熔池宽度增加0.5 mm、深度减小0.1 mm。通过激光熔凝实验验证数值模拟结果与实际情况基本吻合。

The influences of ultrasonic field on temperature field, flow field and the melt pool morphology during laser melting are studied through numerical simulation and experiment. A new three-dimensional mathematical model describing the ultrasonic field and temperature field in the laser melting with ultrasonic vibration is developed. The temperature field and flow field of the laser melt pool variation are analyzed systematically by the finite volume method for coupled ultrasonic field and temperature field in laser melt pool simulation analysis. The results show that the temperature of molten pool under the effect of ultrasonic field is slightly lower than that of not applying ultrasonic field. The flow rate increases by 72%, but the effect of ultrasonic field does not change the circulation tendency of Marangoni flow without ultrasonic. The width of melt pool increases by 0.5 mm and depth reduces by 0.1 mm under the influence of ultrasonic field. It′s verified that the numerical simulation results are consistent with actual situation by laser melting experiment basically.