农耕刀表面激光再制造涂层及其组织研究  

Laser Remanufacturing Layer and Microstructure Characteristic of Farm Tools Steel

作　　者：产玉飞 张敏[1] 陈长军[1] Chan Yufei;Zhang Min;Chen Changjun(Laser Pnuessing Research Center,School of Mechanical and Electric Engineering,Soochow University,Suzhou,Jiangsu 215021,China)

机构地区：[1]苏州大学机电工程学院激光加工中心,江苏苏州215021

出　　处：《应用激光》2019年第1期54-60,共7页Applied Laser

基　　金：国家自然科学基金资助项目(项目编号:51172221);苏州市科技计划资助项目(项目编号:SYG201642)

摘　　要：农机刀具易于磨损的特点,采用激光再制造的方法对农耕刀具表面制备NiCr+WC涂层,并对涂层和涂层与基材的界面显微组织进行了分析,最后通过Abaqus对再制造层及其界面的温度场进行了模拟。实验结果表明,通过激光再制造方法可以成功制备出与基材呈良好冶金结合的耐磨强化涂层,通过SEM观察发现涂层的WC与NiCr合金形成了良好的复合材料,涂层中晶粒细化,硬质颗粒WC均匀分布在NiCr合金基体上,形成了良好的结合界面,模拟结果与实验结果的温度场分布具有一致性。According to the feature of the easy wear of agricultural machine tools,use laser remanufacturing method to produce NiCr+WC coating on the surface of farm tools steel.The microstructure of the coating and the interface between the coating and the substrate was analyzed.The temperature field of the remanufacturing layer and its interface was simulated by Abaqus.The experimental results show that using laser remanufacturing method can successfully prepare a wear-resistant layer with good metallurgical bonding with the substrate.The SEM analysis shows that WC of coating and NiCr alloy form a good composite material,and the grains in the coating are refined.The hard WC particles are evenly distributed on NiCr alloy base material,forming a good bonding interface.The simulation results are consistent with the temperature field distribution of the experimental results.

关 键 词：农机刀具钢 NiCr+WC涂层 激光再制造 界面结合 显微组织 

分 类 号：TN249[电子电信—物理电子学] TG729[金属学及工艺—刀具与模具]