激光熔覆Fe-W合金涂层的组织及性能  

Microstructure and properties of Fe-W composite coating by laser cladding

作　　者：武扬[1] 虞钢[1] 何秀丽[1] 宁伟健[1] 

机构地区：[1]中国科学院力学研究所先进制造工艺力学实验室,北京100190

出　　处：《焊接学报》2012年第2期37-40,44,共5页Transactions of The China Welding Institution

基　　金：国家自然科学基金重点资助项目(10832011)

摘　　要：以纯钨粉末为熔覆材料,采用同轴送粉激光熔覆技术,在Q235A钢表面制备了Fe-W合金耐磨涂层.利用X射线衍射(XRD)、光学显微镜、扫描电镜(SEM)及能谱(EDS)对熔覆层的显微组织进行了分析,用显微硬度计和摩擦磨损试验机对熔覆层的硬度和耐磨性进行了测试.结果表明,熔覆层与基底冶金结合,无明显裂纹或气孔,涂层内部由致密的粗大树枝状和短棒状Fe7W6增强相以及弥散分布的细小颗粒状Fe2W相组成,其均匀分布在α-Fe固溶体中.熔覆层平均硬度700 HV,为基材Q235A钢的3.5倍,同时耐磨性能也得到了显著提高.An investigation of laser cladding Fe-W composite coating on Q235 steel was performed by injection of tungsten powder.The microstructure of the coating was analyzed with X-ray diffraction(XRD),optical microscope,scanning electron microscopy(SEM) and energy disperse spectroscopy(EDS).The microhardness and wear resistance were examined by hardness tester and abrading machine.The coating was metallurgically bonded with the substrate without visible crack or pore.The clad layer had a microstructure consisting of primary coarse dendrite or short stick Fe7W6 and fine isolated Fe2W particles which uniformly dispersed in the α-Fe matrix.The average microhardness of the clad layer was approximately 700 HV which was 3.5 times greater than that of the Q235 substrate.The wear resistance was also obviously improved.

关 键 词：激光熔覆 同轴送粉 Fe-W合金涂层 显微硬度 耐磨性 

分 类 号：TG146.4[一般工业技术—材料科学与工程] TN249[金属学及工艺—金属材料]