中文摘要：

为满足零件不同部位的不同性能要求，采用激光熔化沉积方法制备出GH163／Rene95镍基双合金材料薄壁，着重分析了所沉积材料的微观组织及双合金的界面特征。结果表明，激光熔化沉积镍基合金沿沉积高度方向呈外延生长的定向凝固组织；在双合金界面处，枝晶亦呈外延生长，没有明显的界面；显微硬度测试表明，在双合金界面处，过渡区硬度呈连续变化；GH163／Rene95镍基双合金的界面结合强度高于GH163的强度，沉积态GH163合金的室温抗拉强度在800MPa左右。

英文摘要：

To meet the requirement of different properties at different location within one component, a thin wall from GH163/Rene95 nickel based dual-alloy is fabricated by laser direct deposition. Microstructure and the interface between these two alloys of the deposited materials are characterized in detail. The results indicates that, epitaxial directional solidification microstructure is obtained for both alloys along the building-up direction, which passes through the interface of the dual-alloy. And there is no clear interface between these two alloys. Microhardness tests show that there existes a transition region, with which hardness changed smoothly. The interface bonding strength of the dual-alloy is higher than that for as-deposited GH163 alloy, which is about 800 MPa.