钢基表面激光合金化制备Ni-Al-Fe金属间化合物涂层  

Preparing of Ni-Al-Fe Intermetallic Compound Coatings on Steel Substrate by Laser Alloying

作　　者：程广萍[1,2] 

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [2]安徽省高校金属材料与加工重点实验室,安徽马鞍山243002

出　　处：《应用激光》2011年第2期102-106,共5页Applied Laser

基　　金：安徽省中韩国际科技合作计划资助项目(项目编号:08080703020)

摘　　要：采用激光技术在钢基体表面熔覆镍铝合金,借助基体铁的熔入合金化制备Ni-Al-Fe金属间化合物涂层。实验结果获得了致密、无裂纹并与基体良好冶金结合的涂层,涂层为β-NiAl(Fe)相与γ′-Ni_3Al(Fe)相构成的两相合金,其中β-NiAl(Fe)相数量较多,呈树枝晶形貌,韧性相对较好的γ′-Ni_3Al(Fe)相数量较少,但呈连续网状分布于β-NiAl(Fe)相周围;钢基体中的Fe元素对β-NiAl(Fe)相和γ′-Ni_3Al(Fe)相具有较大的熔入合金化作用,两相中各元素原子百分比Ni:Al:Fe分别为41:31:28和49:17:34,这种成分与组织结构有利于降低涂层脆性。Ni-Al-Fe Intermetallic compound coatings were prepared on mild steel substrate with nickel-aluminum alloy powders by laser cladding. The results show that the compact and no crack coatings bonded metallurgically with the suhstrate are obtained. The two phases mierostrueture of the coatings consist mainly of dendritic β-NiAl （Fe）, which are surrounded continuously by γ-Ni3Al（Fe） with higher toughness. A certain amount of Fe element from the substrate are solution both in the 13-NiA1 and γ-Ni3Al. The ratios of the atomic percentages of Ni, Al, Fe in NiM （Fe） and Ni3A1 （Fe） phase are respectively 41：31：28 and 49：17：34. This kind of microstructure and chemical composition are beneficial to reduce the coatings brittleness.

关 键 词：激光加工 反应合成 金属间化合物 涂层 Ni—Al 

分 类 号：TG174.44[金属学及工艺—金属表面处理]