高端刀具光纤激光同轴送粉熔敷Ni35-WC硬质合金

Laser Cladding Ni35-WC Cemented Carbide on the High-end Knives by Fiber Laser Coaxial Powder

针对高端菜刀刀刃所采用的430不锈钢耐磨性不够、使用寿命较低的问题,采用激光熔敷Ni35-WC硬质合金的方法对其进行改善处理。研究了不同熔敷工艺对熔敷层一次熔敷厚度和微观组织结构的影响。结果表明,激光功率在1 600W范围内,激光功率越大,一次熔敷层厚度越大;氩气流量增大,一次熔敷层厚度先增加后减小;熔敷速度增加,一次熔敷层厚度减小。含60%WC的Ni35-WC硬质合金粉末在激光功率为1 600 W,熔敷速度为300mm/min,氩气流量为4L/min时获得最理想的熔敷效果。一次最大熔敷厚度可达2.5mm,表面无裂纹,达到了刀具开刃的理想厚度。熔敷层组织为细针状马氏体加少量残留奥氏体。平均显微硬度可达8.50GPa,摩擦系数小,耐磨性好。

For the problem of insufficient wear resistance and low service life of 430 stainless steel of high-end kitchen knife- edge, Ni35-WC cemented carbide was cladded on the surface of 430 stainless steel by laser cladding to improve performance. The influence of different cladding process parameters on cladding layer thickness at one time and the microstructure of the cladding layer was studied. The results show that the thickness of cladding layer increases with the increase of laser power when laser power is within the scope of the 1 600 W. The cladding layer thickness increases first and then decreases with the increase of argon gas flow. The cladding layer thickness decreases with the increase of cladding rate. Ni35-WC cemented car- bide powder gain the ideal effect of cladding when laser power is 1 600 W, cladding rate is 300 mm/min and the argon gas flow is(4 L/min). The maximum cladding thickness is up to 2.5 mm at a time without crack on the surface , which is the ideal thickness of knife-edge. The microstructure of cladding layer is fine acieular martensite with a small amount of residual austen- ire. The average microhardness is up to 8.50 GPa and friction coefficient is small and wear resistance is good.