45钢表面激光熔覆Ni35合金涂层的组织及性能  

Microstructure and Performance of Ni35 Alloy Laser Cladding on 45 Steel Substrate

作　　者：张晓东[1,2] 董世运 徐滨士[1] 王志坚[1] 闫世兴[1] 

机构地区：[1]装甲兵工程学院装备再制造技术国防科技重点实验室,北京100072 [2]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001

出　　处：《装甲兵工程学院学报》2009年第3期73-76,共4页Journal of Academy of Armored Force Engineering

基　　金：国家自然科学基金项目(50735006);国家“973”计划项目(2007CB607601);国家科技支撑计划项目(2006BAF02A19)

摘　　要：为了修复45钢磨损装备零件,采用激光熔覆工艺在45钢表面制备了Ni35合金涂层。利用扫描电镜（SEM）、能谱分析仪（EDS）、X射线衍射仪、显微硬度计和磨损试验机分析了熔覆层的显微组织,测试了涂层的硬度和耐磨性能。结果表明：熔覆层由γ-Ni和Ni3B两相组成;熔覆层中存在平面晶、胞状晶、枝晶等多种形态;Ni35熔覆层的硬度为450HV,熔覆层的耐磨性是基体的2.86倍。In order to repair 45 steel equipment worn parts, the Ni35 alloy powders are laser - cladded on 45 steel. The microstructure, hardness, wear resistance of cladding layer are analyzed by using scanning electron microscope, X-ray diffractometer, microhardness tester and wear testing machine. The results show that laser-cladding layer is composed mainly of ~/-Ni and Ni3B phases. Microstructure of cladding zone consists of dentrite, cellular and plane crystal, etc. The microhardness of laser-cladded layer is 450 HV. The wear resistance of laser cladded coatings is 2.86 times that of the unclad 45 steel.

关 键 词：激光熔覆 组织 摩擦磨损 

分 类 号：TG115[金属学及工艺—物理冶金]