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为探究扫描路径和堆积方式对TC4(Ti-6Al-4V)合金多层激光熔覆层质量的影响,采用IPG光纤激光器和侧向送粉系统,在TC4合金表面进行多层激光熔覆试验。熔覆粉末选用Ni60A自熔性合金粉末,送粉电压选择10V,多道搭接率选择45%。采用设计的三种不同堆积方案进行熔覆试验。方案一:每层选择热搭接的扫描方式进行逐层堆积;方案二:单数层选用热搭接的扫描方式,双数层选用和单数层方向垂直的扫描方向进行逐层堆积;方案三:每层选用热搭接的扫描方式,熔覆完成后再进行一次激光重熔,逐层堆积。结果表明,方案二得到的熔覆层表面最平整,洛氏硬度最高;方案三得到的熔覆层表面光滑,硬度较高,但是熔覆层表面裂纹较多。
In order to explore the influence of scan path and deposition mode on the quality of multi-layer laser cladding TC4 (Ti-6Al-4V) alloy, multilayer laser cladding test was carried out on the surface of TC4 alloy by using IPG fiber laser and lateral powder feeding system. Cladding powder used Ni60A self-fluxing alloy powder, powder feeding voltage selection 10V, multi-channel lap selection rate of 45%. Three different stacking schemes were used for the cladding test. Solution 1: Each layer selects the hot lap scanning mode to layer by layer; Scheme 2: Single layer selection Hot lap scanning mode, double layer selection and single layer direction vertical scanning direction layer by layer; Scheme 3: Each layer selected thermal lap scan mode, the cladding is completed after a laser remelting, layer by layer accumulation. The results show that the surface of the cladding layer obtained in the second scheme is the most flat and has the highest Rockwell hardness. The cladding layer obtained in the third scheme has a smooth surface and a high hardness, but there are more surface cracks on the cladding layer.