镀铬Inconel690合金管YAG激光熔凝层的结构及元素扩散

Microstructure and Elements Diffusion Behavior of YAG Laser Remelt Layer of Electroplated Chrome Coating on Inconel690 Alloy Tube

采用YAG固体激光器,在固定脉冲频率和扫描速度条件下对电镀铬后的Inconel690合金管进行激光辐照处理,获得激光熔凝层,研究了不同工作电流下熔凝层的微观结构和形貌;用EDX方法研究了Cr、Ni元素在熔凝层中的扩散行为。结果表明:YAG固体激光器处理Inconel690合金管镀铬层在较高的工作电流下仍然能够获得质量优良的熔凝层,随工作电流的增大,熔凝层深度增加;在不同工作电流下,从管壁外缘至管的内部,Cr、Ni元素分布均匀,浓度梯度较小。

Under the conditions of a fixed pulse fxequency and scanning speed, the laser remelt layer was obtained by using YAG laser cladding methed on the electroplated chrome coating on the Incone1690 alloy tube. The microstructure of the laser remelt layer under different working currents was investigated by SEM, as well as the diffusion behavior of chrome and nickel in the layer were analyzed by EDX. The results show that the laser layer depth increases with the increase of the current, and high quality laser layer can be obtained even at high working current. In the all laser remelt layer, from the outer surface to the interior of the tube, the distribution of chrome and nickle tends to be uniform and the concentration gradient is small.