激光多层熔覆FGH95高温合金的显微组织  

Microstructure of multiple-layer laser clad FGH95 superalloy

作　　者：费群星[1] 张雁[1] 白凤民[1] 谭永生[1] 

机构地区：[1]北京航空制造工程研究所高能束流加工技术重点实验室,北京100024

出　　处：《金属热处理》2009年第8期73-76,共4页Heat Treatment of Metals

基　　金：高能束流加工技术重点实验室09基金项目

摘　　要：利用激光多层熔覆工艺制出表面平整无变形的FGH95高温合金样品。样品截面呈层片状结构,显微组织为胞状树枝晶,熔池不同部位的晶粒取向不同。γ′强化相呈岛状或链状弥散分布于γ枝晶晶界处。合金的主要成分在截面上均匀分布,无明显偏析。样件显微硬度为430～540HV0.2,基本达到FGH95热等静压件的水平。FGH95 superalloy samples were formed by multiple-layer laser cladding with fiat surface and without distortion. The cross section shows a lamellar structure. The microstructure is cellular dendrites whose grain orientation varied according as different place of the melting pool. The strengthening phase γ＇ dispersing in the dendritic （γ）boundaries presents an appearance of island or link. EDS results show that the main alloying elements distribute homogeneously in the structure. The microhardness is 430 - 540 HV0. 2, equivalent to that of components manufactured by hot isostatic pressing（HIP） process.

关 键 词：激光多层熔覆 FGH95高温合金 显微组织 显微硬度 

分 类 号：TF125.212[冶金工程—粉末冶金]