激光熔化沉积α/Fe_9Cr_9Si_2三元金属硅化物耐磨合金组织和摩擦学性能  

Microstructure and Tribological Property of Laser Melt Deposited α/Fe_9Cr_9Si_2 Metal Silicide Alloys

作　　者：袁源[1] 王华明[1] 

机构地区：[1]北京航空航天大学,北京100083

出　　处：《稀有金属材料与工程》2008年第9期1660-1663,共4页Rare Metal Materials and Engineering

基　　金：国家自然基金资助项目(50331010;50625413)

摘　　要：为改善三元金属硅化物Fe9Cr9Si2的室温脆性,利用激光熔化沉积方法制备了铁基固溶体α增韧Fe9Cr9Si2三元金属硅化物合金(简称α/Fe9Cr9Si2合金),其组织由Fe9Cr9Si2初生树枝晶和枝晶间铁基固溶体α组成,合金硬度随Fe9Cr9Si2初生树枝晶体积分数的增加而提高。与单相Fe9Cr9Si2合金相比,铁基固溶体增韧Fe9Cr9Si2合金韧性明显改善;在干滑动摩擦条件下,α/Fe9Cr9Si2合金具有低的摩擦系数,并随Fe9Cr9Si2体积分数的提高而降低。The ternary intermetallic compound Fe9Cr9Si2 is expected to be a promising wear and corrosion resistant material due to its inherent high hardness, covalent-dominated strong atomic bonds and high Cr and Si content. Room temperature brittleness is currently the main obstacle preventing it from industrial applications. In order to improve the ductility of Fe9Cr9Si2, the Fe-base solid solution toughened FegCr9Si2 alloys were designed and fabricated by laser melting/deposition manufacturing process. Microstructure of the alloys was characterized by optical microscopy （OM）, X-ray diffraction （XRD）, energy dispersive spectroscopy （EDS） and Vickers microhardness measurement. Microstructure of the alloys consists of FegCrgSi2 primary dendrite and the interdendritic Fe-base solid solution α. Friction coefficient of the alloys was evaluated under dry sliding friction condition. Volume fraction of FegCrgSi2 primary dendrite and average hardness of the alloys increases with the increasing Cr content. Friction coefficient of the alloys decreases with the increasing of FegCr9Si2 primary dendrite volume friction.

关 键 词：金属间化合物 Α相 Fe9Cr9Si2 摩擦系数 激光熔化沉积 

分 类 号：TG113[金属学及工艺—物理冶金]