激光同轴熔注球形WC增强颗粒的工艺参数研究  

Study on Process Parameters of Coaxial Laser Melt Injection with Spherical WC Reinforcement Particles

作　　者：王梁 罗建[1,2] 胡勇 夏洪超 姚建华[1,2] WANG Liang;LUO Jian;HU Yong;XIA Hongchao;YAO Jianhua(Institute of Laser Advanced Manufacturing,Zhejiang University of Technology,Hangzhou 310014;Zhejiang Provincial Collaborative Innovation Center of High-end Laser Manufacturing Equipment,Zhejiang University of Technology,Hangzhou 310014)

机构地区：[1]浙江工业大学激光先进制造研究院,杭州310014 [2]浙江工业大学高端激光制造装备省部共建协同创新中心,杭州310014

出　　处：《机械工程学报》2021年第7期253-261,共9页Journal of Mechanical Engineering

基　　金：国家重点研发计划(52035014);浙江省属高校基本科研业务费(RF-C2019003)资助项目。

摘　　要：采用同轴送粉方式作为粉末输送形式,以球形WC为熔注增强颗粒,探究激光熔注制备WC颗粒增强金属基复合材料涂层的工艺参数临界条件。通过建立运动过程中增强颗粒的速度模型与温升模型,分析喷射过程中增强颗粒温度与激光功率、颗粒尺寸以及颗粒初始速度之间的关系,进而获得激光同轴熔注WC过程中,确保颗粒保持固态的颗粒尺寸、激光功率和颗粒初始速度等工艺参数的临界条件。同时对不同直径的球形WC颗粒进行了同轴熔注试验验证。计算和试验结果表明:在扫描速度为6 mm/s,送粉率为10 g/min的条件下,当激光功率密度为119 W/mm^(2)时,为保证颗粒保持固态,颗粒的直径须大于75μm。如需要注入直径小于75μm的WC颗粒,则必须降低激光功率密度至95 W/mm^(2)以下。A movement model and a thermal model of the reinforcement particles are built to study the temperature of particles with different laser power, WC particle diameters and particle initial velocity in the processes of the coaxial laser melt injection. The critical conditions of WC particle diameters, laser power and particle initial velocity are studied to achieve coaxial laser melt injection preparation of the WC particle reinforced metal matrix composite coating, and the WC particle with different diameters have been chosen to inject into 316 stainless steel. The calculation and experimental results show that when scanning speed is 6 mm/s, powder feeding rate is 10 g/min, the laser power density is 119 W/mm^(2), in order to ensure remaining the particles solid state, the particles diameter is proper to be larger than 75 μm under the current coaxial powder feeding nozzle and laser process parameters. To ensure injecting WC particles without melting, the particles diameter is proper to be less than 75 μm and the laser power density has to be reduced below 95 W/mm^(2).

关 键 词：激光同轴熔注 增强颗粒 数值计算 球形WC 

分 类 号：TG111[金属学及工艺—物理冶金] TN249[金属学及工艺—金属学]