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通过物理实验、ANSYS有限元数值模拟和试验相结合,研究了超声波在BT20钛合金熔池中的传播作用机理,设计阶梯型变幅杆,并将之用于激光沉积修复过程中。物理实验结果表明,声流效应在BT20钛合金熔池中占据主导地位。模拟结果表明,阶梯型变幅杆的设计可以最大化的扩大振幅且振幅分布较为均匀,做成可拆卸的变幅杆可以在满足试验条件的基础上增加试验的灵活性。将超声作用在熔池内部,可以加快冷却速度,缩短凝固时间,使沉积层中的α片层组织变短,可使沉积修复区域硬度提高。
Through the combination of physical experiment, ANSYS finite element simulation and experiment, the mechanism of ultrasonic wave propagation in BT20 titanium alloy molten pool was studied. The ladder-type horn was designed and used in laser deposition repair process. The physical experiment results show that the acoustic flow effect occupies a dominant position in the BT20 titanium alloy weld pool. The simulation results show that the design of the ladder-type horn can maximize the amplitude and the amplitude distribution is more uniform, and the detachable horn can increase the flexibility of the test on the basis of satisfying the experimental conditions. The role of ultrasound in the weld pool, you can speed up the cooling rate and shorten the solidification time, so that the α lamellae in the deposited layer becomes shorter, the hardness of the deposition repair area can be improved.