中文摘要：

采用超声振动热效应转化和施加动态边界条件的方法对超声振动边界条件作近似处理,研究了超声振动辅助激光熔覆Ti C/Fe Al复合涂层的温度场分布规律,探讨了超声振幅和扫描速度对温度场的影响。结果表明,超声振动作用下,温度梯度为零的范围更大,温度场分布更为均匀;超声振动有效降低了涂层中和界面结合区的温度梯度及残余应力;超声振幅越大,扫描速度越小,基材和涂层的温度越高,涂层至界面结合区之间的温度梯度越小。

英文摘要：

By making approximation for the ultrasonic vibration boundary conditions with the method of combining thermal effects conversion and dynamic boundary conditions , the temperature field of TiC/FeAl composite coating in laser cladding assisted with ultrasonic vibration was investigated , and the influence of ultrasonic amplitude and scanning speed on the temperature field was discussed .The results show that the range of zero temperature gradient is greater and the temperature field distribution is more uniform in ultrasonic vibration laser cladding .The ultrasonic vibration can effectively reduce the temperature gradient and residual stress both in the coating and interface .The greater ultrasonic amplitude and smaller scanning speed make the higher temperature of substrate and coating and the lower temperature gradient between the coating and interface .