超声辅助激光熔覆TiCN镍基涂层组织及性能研究

Ultrasonic-assisted laser cladding of TiCN nickel-based coating organization and properties

为了探究超声频率对激光熔覆涂层的影响,设置5组对照实验。通过施加超声频率0 kHz、26 kHz、30 kHz、34 kHz和38 kHz辅助制备出TiCN增强镍基涂层,对各涂层宏观形貌、显微组织及耐磨性进行了研究。结果显示:施加超声不会使涂层产生新的物相且在一定程度上促进TiCN增强相的生成;增加超声频率,涂层中气泡数量减少,晶粒更细小紧密,涂层中团聚现象减少;增加超声频率,涂层显微硬度增加,当超声频率为38 kHz时涂层显微硬度最高且变化平稳;对比未施加超声的涂层,施加超声频率38 kHz时的涂层磨损量减少约30%,且主要磨损由粘着磨损转变为轻微犁削。

In order to investigate the effect of ultrasonic frequency on laser clad coatings,five sets of control experiments were conducted to investigate the macroscopic morphology,microstructure and wear resistance of TiCN-enhanced nickel-based coatings by applying ultrasonic frequencies of 0 kHz,26 kHz,30 kHz,34 kHz and 38 kHz.The results showed that:the application of ultrasound did not generate new phases in the coatings and promoted the generation of TiCN-enhanced phases to some extent;the number of bubbles in the coatings decreased with increasing ultrasound frequency,the grains were finer and tighter,and the agglomeration phenomenon in the coatings was reduced;the microhardness of the coatings increased with increasing ultrasound frequency,and the microhardness of the coatings was highest and varied smoothly when the ultrasound frequency was 38 kHz;compared with the coatings without the application of ultrasound,the microhardness of the coatings with the application of 38 kHz was higher.Compared with the coating without ultrasound,the coating wear at 38 kHz was reduced by about 30%,and the main wear was changed from adhesive wear to slight plowing.