超音速激光沉积与激光熔覆Stellite6涂层的对比研究  

Comparative Research of Stellite 6 Coatings Prepared by Supersonic Laser Deposition and Laser Cladding

作　　者：李祉宏[1,2] 杨理京[1,2] 张群莉[1,2] 李波[1,2] 姚建华[1,2] 

机构地区：[1]浙江工业大学激光加工技术工程研究中心,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》2015年第5期124-130,共7页Chinese Journal of Lasers

基　　金：浙江省重大科技专项重点工业项目(2012C11001);浙江省自然科学基金青年基金项目(LQ13E050012);江苏省光子制造科学与技术重点实验室开放基金(GZ201307);浙江省博士后科研择优资助项目(Z42102002)

摘　　要：超音速激光沉积技术(SLD)将冷喷涂技术与激光技术相复合,保持了冷喷涂固态沉积的优势,并极大地拓展了单一冷喷涂技术的可喷涂材料范围。采用SLD制备了Stellite 6硬质涂层,并与激光熔覆(LC)Stellite 6涂层在宏观形貌、显微组织、界面稀释和显微硬度等方面进行对比研究。研究表明,SLD涂层保留了原始Stellite 6颗粒内部组织,不同于LC涂层的粗大枝晶组织;LC涂层稀释率约为12%,而SLD涂层无宏观稀释区;与LC热影响区相比,SLD热影响区变窄;SLD Stellite 6涂层平均显微硬度达到694 HV0.2,约为LC Stellite 6涂层的1.45倍。Supersonic laser deposition （SLD） is a new coating and fabrication process in which a supersonic powder stream produced by cold spray （CS） impinges on a substrate simultaneously heated by laser irradiation. Due to laser heating, the range of materials deposited in SLD process can be expanded to higher strength materials which are usually hard or even impossible to be deposited solely by CS. Stellite 6 coating prepared by SLD and laser cladding （LC） are studied and compared in terms of macro-morphology, microstructure, interface dilution and micro-hardness. The results show that the original nature of the impacting particles remains in the SLD Stellite 6 coating, and its microstructure is different from the coarse dendritic microstructure of LC Stellite 6 coating. The dilution rate of LC coating is about 12%, while no macroscopic dilution zone is found in supersonic laser deposition coating. The heat-affected zone of supersonic laser deposition shrinks compared with that of LC. The average microhardness of Stellite 6 coating produced by SLD is 694 HV02, which is 1.45 times higher than that of LC Stellite 6 coating.

关 键 词：激光 超音速激光沉积 STELLITE 6 微观结构 

分 类 号：TN249[电子电信—物理电子学] TG146.1[一般工业技术—材料科学与工程]