超声振动对激光熔覆Ni55涂层组织及性能影响  

Effect of ultrasonic vibration on microstructure and property of laser cladding Ni55 coating

作　　者：李美艳[1] 韩彬[1] 王勇[1] 宋立新[2] 

机构地区：[1]中国石油大学(华东)机电工程学院,山东青岛266580 [2]海洋石油工程(青岛)有限公司,山东青岛266520

出　　处：《材料热处理学报》2015年第10期199-203,共5页Transactions of Materials and Heat Treatment

基　　金：石油天然气装备教育部重点实验室(西南石油大学)资助项目(OGE201403-04);国家自然科学基金(51179202);国家"863"计划项目(2012AA09A203);山东省自主创新计划(2012CX80101);山东省自然科学基金(ZR2014EEQ037)

摘　　要：在45钢表面激光熔覆过程中同步施加超声振动制备Ni55涂层,采用SEM、XRD等手段分析熔覆层的显微组织及相组成,并检测熔覆层的耐蚀性和耐磨性能。结果表明,Ni55熔覆层内生成方向性较强的树枝晶,由γ-(Fe,Ni)固溶体和M23C6组成。同步施加超声振动对相组成无影响,但使熔覆层底部粗大的柱状晶消失,中部和顶部方向性较强的树枝晶被打乱,生成细小的树枝晶。此外,超声振动使熔覆层的显微硬度提高至635 HV0.1,耐蚀性明显提高,腐蚀电流密度约为Ni55熔覆层的1/4。施加超声振动的熔覆层耐磨性能优于未施加超声振动的试样。Ni55 coating was prepared on the surface of 45 steel by laser cladding process companied by ultrasonic vibration. The microstructure and phase composition of the cladding coating were analyzed by means of SEM and XRD,the corrosion resistance and wear resistance were measured. The results show that the dendrite with strong direction can be generated in Ni55 coating,which consists of γ-（ Fe,Ni） solid solution and M23C6 carbides. Application of ultrasonic vibration has no effect on the phase composition,but the columnar crystal at the bottom of the cladding layer disappears and fine dendrite can be formed in the middle and upper regions. In addition,the microhardness of the coating increases to 635 HV0. 1 and the corrosion resistance improves due to the application of ultrasonic vibration.The wear resistance of the sample assisted by ultrasonic vibration is better than that of without ultrasonic vibration.

关 键 词：超声振动 激光熔覆 组织 耐蚀性 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]