基于PLC控制的TiB_(2)/S136复合材料的激光选区熔化成形工艺与组织性能研究  

Laser Selective Melting Process and Microstructure&Properties of TiB_(2)/S136 Composites Based on PLC Control

作　　者：王荣华[1] 罗丽蓉 Wang Ronghua;Luo Lirong(Inner Mongolia Technical College of Mechanical and Electrical Hohhot,Inner Mongolia 010070,China)

机构地区：[1]内蒙古机电职业技术学院,内蒙古呼和浩特010070

出　　处：《应用激光》2021年第6期1237-1243,共7页Applied Laser

基　　金：内蒙古科技计划资助项目(2018JH16)。

摘　　要：采用X射线衍射仪、扫描电镜、硬度计和摩擦磨损试验机等手段,研究了PLC控制下激光选区熔化成形工艺中激光扫描速度对TiB_(2)/S136复合材料显微组织、硬度和摩擦磨损性能的影响。结果表明:4种不同激光扫描速度下成形件的主要物相都为α-Fe、γ-Fe和TiB_(2);随着激光扫描速度减小,成形件的致密度先增加后减小,在激光扫描速度为700 mm/s时取得最大值(98.4%),此时成形件中未见明显孔洞或微裂纹缺陷;随着激光扫描速度减小,成形件XY和YZ面硬度、平均摩擦因数和磨损率都呈现先减小后增大特征,在激光扫描速度为700 mm/s时取得硬度最大值、平均摩擦因数和磨损率最小值,这主要与此时成形件致密性较高、晶粒细小均匀以及具有较高的硬度有关。The effects of laser scanning speed on microstructure,hardness and friction and wear properties of TiB_(2)/S136 composites in laser selective melting process controlled by PLC were studied by means of X-ray diffraction,scanning electron microscopy,hardness tester and friction and wear tester.The results show that the main phases of the formed parts are α-Fe,γ-Fe and TiB_(2) under four different laser scanning speeds;with the decrease of laser scanning speed,the compactness of the formed parts first increases and then decreases,and when the laser scanning speed is 700 mm/s,the maximum value(98.4%)is obtained,and there are no obvious holes or microcracks in the formed parts.With the decrease of laser scanning speed,the hardness,average friction coefficient and wear rate of XY and YZ surfaces of the formed parts decrease first and then increase.When the laser scanning speed is 700 mm/s,the maximum hardness,the minimum average friction coefficient and wear rate are obtained,which is mainly due to the high compactness,fine and uniform grains and high hardness are related to the shape.

关 键 词：复合材料 激光选区熔化 成形工艺 组织 性能 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TN249[电子电信—物理电子学]