激光功率对2Cr13不锈钢激光熔覆涂层的影响

Effect of Laser Power on Laser Cladding Coat of 2Cr13 Stainless Steel

以某注水泵柱塞为研究对象,针对柱塞在工作过程中出现的磨损失效问题展开研究。采用激光熔覆工艺在2Cr13不锈钢表面熔覆Ni60+25%WC复合粉末,研究了当扫描速度不变时,激光功率对熔覆层的显微组织和硬度分布情况的影响,实验结果表明,熔覆层组织主要由树枝状晶组成,当功率为1200W时熔覆层组织中出现了些明显聚集粗化的枝晶组织,和一些呈块状分布的组织(白亮组织),在该情况下熔覆层表现出最高的硬度HV0.1=1050,是基体硬度的3倍多,因此,激光熔覆工艺可以被用于提高零件表面硬度及耐磨性,最终确定在扫描速度为450mm/min,功率为1200W。

Taking a plunger of a water injection pump as the research object, this paper studies the wear failure of the plunger during the working process. The Ni60 ＋ 25% WC composite powder is deposited on the surface of 2Cr13 stainless steel by laser cladding. The effect of laser power on the microstructure and hardness distribution of cladding layer when the scanning speed is constant is studied. The experimental results show that the cladding structure is mainly composed of dendritic crystals; when the power is 1200 W, there were some aggregated coarsening dendrites and some massive tissue（white light organization）, in this case, the cladding layer exhibits the highest hardness HV0.1 = 1050, which is more than three times of the hardness of substrate. Therefore, the laser cladding process can be used to improve the surface hardness and wear resistance, and it ultimately determines that the scanning speed is 450mm/min and the power is1200 W.