激光熔覆原位合成碳化钨增强铁基表面复合材料的研究  

In situ synthesis tungsten carbide reinforced ferrous matrix surface composites by laser cladding

作　　者：陈莹莹[1] 李文戈[1] 吴培桂[1] 

机构地区：[1]上海工程技术大学材料与工程学院,上海201620

出　　处：《金属热处理》2011年第3期64-67,共4页Heat Treatment of Metals

基　　金：国家自然科学基金(50772066);上海市教委"曙光计划"项目(05SG55);上海市教委重点学科项目(J51402)

摘　　要：利用激光熔覆原位合成技术,在预置N i涂层的45钢表面原位自生碳化钨陶瓷。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)、显微硬度计等分析测试手段对碳化钨陶瓷增强相的组织形貌、物相组成、化学成分及力学性能等方面进行了研究。结果表明,熔覆区内的碳化物由过饱和固溶体共晶析出;涂层与基体间的结合为冶金结合;制备的表面复合材料的硬度高于基体,改性效果极为明显。Multiphase tungsten carbide on 45 steel was fabricated by laser cladding cooperated with combustion synthesis.The microstructure,phase composition,element distribution and mechanical properties of tungsten carbide ceramic reinforcement phase were analyzed by XRD,SEM,EDS and microhardness tester,respectively.The results show that the laser cladding region supersaturated solid solution by eutectic precipitation.The coating and the substrate is metallurgical bonding.The hardness of composite is superior to substrate.In a word,the modification effect is remarkable.

关 键 词：激光熔覆 燃烧合成 原位自生 碳化钨 

分 类 号：TB331[一般工业技术—材料科学与工程] TG156.99[金属学及工艺—热处理]