稳态磁场辅助激光熔注制备梯度涂层  

Graded Coating Produced by Laser Melt Injection Under Steady Magnetic Field

作　　者：宋诗英 王梁[1,2] 胡勇[1,2] 姚建华[1,2] 

机构地区：[1]浙江工业大学激光先进制造研究院,浙江杭州310014 [2]浙江省高端激光制造装备协同创新中心,浙江杭州310014

出　　处：《中国激光》2016年第5期63-70,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(51475429);浙江省自然科学基金青年基金(LQ13E050012)

摘　　要：利用稳态磁场辅助激光熔注,在316L不锈钢基体上成功制备了碳化钨(WC)颗粒分布可调的WC/316L金属基梯度复合材料涂层。讨论了激光熔注时稳态磁场对复合材料涂层中硬质颗粒的分布和组织的影响。研究结果表明,稳态磁场可以抑制熔池流动,降低颗粒在熔池中受到的拖曳力,且随着磁场强度的增大,WC颗粒集中分布在复合材料表层的趋势增大;稳态磁场未改变复合材料层表面的物相种类,但表面的W相含量明显增多,且可使复合材料层表面的共晶组织数量增多、尺寸变大。The WC/316Lmetal-matrix gradient coating was prepared by laser melt injection under a steady magnetic field.The influence of the steady magnetic field on the distribution of hard particles and the microstructure in the composite layer is discussed.The results show that the steady magnetic field can suppress the flow of the molten pool and reduce the drag force on particles in the molten pool.With the increase of the magnetic flux density,the volume rate of WC particles in the upper part of the LMI layer increases.The phase type is preserved no matter whether the steady magnetic field is added or not.However,the content of W-phase significantly increases.The size of the eutectic structure becomes larger and the quantity does as well.

关 键 词：激光技术 稳态磁场 激光熔注 梯度涂层 碳化钨颗粒 

分 类 号：TG148[一般工业技术—材料科学与工程] TN249[金属学及工艺—金属材料]