结晶器用铜合金表面激光熔覆Ni基涂层研究  

Study on the Laser Cladded Ni-based Coating on the Surface of Copper Alloy for Mold

作　　者：徐祥留 陈小红[1] 李伟 周洪雷 刘平[1] 赵伟 XU Xiangliu;CHEN Xiaohong;LI Wei;ZHOU Honglei;LIU Ping;ZHAO Wei(School of Materials Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201900,China;State Key Laboratoryfor Development and Application Technology of Automotive Steels,Shanghai 201900,China)

机构地区：[1]上海理工大学材料科学与工程学院,上海200093 [2]宝山钢铁股份有限公司研究院,上海201900 [3]汽车钢开发与应用技术国家重点实验室,上海201900

出　　处：《上海理工大学学报》2019年第2期137-142,共6页Journal of University of Shanghai For Science and Technology

基　　金：国家重点研发计划项目(2017YFB0306405)

摘　　要：采用IPG-YLS-5000光纤激光器在Cu-Cr-Zr合金表面制备了Ni60+WC合金熔覆层。利用扫描电子显微镜、X射线衍射仪等分析手段对熔覆层的微观组织、界面成分、物相组成、硬度及耐磨性进行表征和测试,得到了工艺参数对稀释率的影响规律。结果显示,提高激光功率和激光扫描速率均可以增加稀释率。当WC含量较少时,WC颗粒全部熔解;当WC含量较多时,存在未熔解的WC颗粒相。随着WC含量的增加,熔覆层组织先粗化后细化,枝晶间分布有颗粒相。熔覆层的硬度和耐磨性远高于基体,并随着WC含量的增加而增加,熔覆层的硬度最高可达1000HV。随着WC含量的增加,熔覆层的磨损失重逐渐变小,与铜合金相比,当WC的含量达到20%时,磨损失重仅为1.1g。The Ni60+WC alloy cladding layer was prepared on the surface of Cu-Cr-Zr alloy by IPGYLS- 5000 fiber laser.The influence of process parameters on the dilution rate was obtained by characterizing and testing the microstructure,interfacial composition,phase composition,hardness and wear resistance of the cladding layer via SEM and XRD.The results show that raising either the laser power or laser scanning rate can promote the dilution rate.When the WC content is low,all WC particles can dissolve.When the WC content is high,there are undissolved WC particles.With the increase of WC content,the microstructure of the cladding layer become coarsened at first and then is refined,and granular phases are distributed between dendrites.The hardness and wear resistance of the cladding layer are much higher than those of matrix,and increase with the increase of WC content.The hardness of the cladding layer can be up to 1000 HV,the wear weight loss of cladding layer decreases gradually with the increase of WC content,compared with copper alloy the wear weight loss is only 1.1 g when WC content reaches 20%.

关 键 词：激光熔覆 铜合金 稀释率 硬度 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]