激光-感应复合熔覆WC-Ni涂层极限条件研究

为解决熔覆层易开裂、熔覆效率低的问题以及合理地选择工艺参数.进行了激光-感应复合熔覆Ni基WC涂层的实验,定义了激光高速扫描下的极限熔覆状态,研究了激光比能与粉末面密度对熔覆层宏观形貌的影响规律.结果表明,最小激光比能、最大熔覆层厚度、接触角均与最大粉末面密度呈线性关系;激光-感应复合熔覆速度达3000 mm/min,送粉率达82.7 g/min,相对单纯激光熔覆技术的效率提高了近5倍,而且获得的Ni60A+20%WC涂层经检测无裂纹.

Study on Ultimate Conditions of Ni-based WC Coatings Prepared by Laser Induction-hybrid Cladding

To solve the problem of the cracking of cladding layer and low cladding efficiency, to choose the reasonable processing parameters, laser induction hybrid cladding experiment was carried out to prepare Ni-based WC composite coatings. The effects of laser specific energy and powder density per area on the macrostructure of the composite coatings were investigated by defining the ultimate cladding states of high laser scanning speed. The results show that the minimum laser specific energy, the maximum cladding thickness and the contact angle have a linear relationship with the maximum powder density per area. Moreover, the velocity of laser induction hybrid cladding is as fast as 3000 mm/min, the feeding powder rate is up to 82.7 g/min, the efficiency of laser induction hybrid cladding is approximately 5 t higher than that of the individual laser cladding, Ni-based WC composite coatings are flee of cracks.