超声振动对H13钢表面激光熔覆TiC增强Cr12MoV的影响
Effect of Ultrasonic Vibration on Laser Cladding TiC Enhanced Cr12MoV on H13 Steel Surface

为了研究超声振动对激光熔覆TiC增强Cr12MoV外观、组织及硬度的影响。在其他参数不变，在无超声振动和有超声振动两种情况下对TiC增强Cr12MoV进行激光熔覆。结果发现同步超声振动的熔覆层比无超声振动的熔覆层外观平整光滑，熔覆层宽度和熔池深度增加，超声振动的空化作用使TiC增强相在熔覆层中的分布更加均匀，从而使整个熔覆层自上而下各点的硬度明显增加；通过摩擦磨损实验发现同步超声振动的熔覆层其耐磨性明显好于未施加超声振动的涂层，摩擦实验60 min后，未同步超声振动的熔覆层失重量为0.038 g，而同步超声振动的熔覆层其失重量仅为0.023 g。因此，超声振动可明显改善熔覆层质量及熔覆层中添加剂的分布，进而改变熔覆层的硬度及耐磨性。
In order to study the effect of ultrasonic vibration on the appearance, structure and hardness of laser cladding TiC reinforced Cr12MoV, with other parameters unchanged, the TiC-enhanced Cr12MoV was cladded under the conditions of no ultrasonic vibration and ultrasonic vibration. It was found that the cladding layer with synchronous ultrasonic vibration has a smoother appearance than the cladding layer without ultrasonic vibration, the width of the cladding layer and the depth of the molten pool are increased, and the cavitation effect of ultrasonic vibration makes the distribution of TiC reinforcing phase in the cladding layer more uniform, so that the hardness of the entire cladding layer from top to bottom is significantly increased. Through the friction and wear experiment, it is found that the wear resistance of the cladding layer with synchronized ultrasonic vibration is significantly better than that of the coating without ultrasonic vibration. After the friction experiment for 60 minutes, the weight loss of the cladding layer without synchronized ultrasonic vibration is 0.038 g, while the weight loss of the vibrating cladding layer is only 0.023 g. Therefore, ultrasonic vibration can significantly improve the quality of the cladding layer and the distribution of additives, thereby changing the hardness and wear resistance.