中文摘要：

采用粉末冶金修复工艺（China Powder Metallurgy,CPM）,利用2种分别混有微量硼合金和纳米镍粉的镍基高温合金粉末对K403缺损叶片进行修复再制造。采用X射线衍射、扫描电子显微镜（SEM）、EDX能谱和电子探针（EPMA）对叶片修复区的相组成、宏观形貌及微观组织进行分析;同时对修复区致密化和界面连接机理进行初步探讨。结果表明,选用合适的修复粉末,用CPM方法能够将缺损的叶片再制造成原有形状与尺寸;混合硼合金的修复粉末对K403合金的修复效果较好;硼元素的扩散对修复区致密化和界面连接起重要作用,期间发生的反应为Ni m B n＋（Cr,W）→γ＋（Cr2,W）B2;经计算,在CPM工艺条件下,界面区的硼浓度可以降低至共晶浓度以下。

英文摘要：

The damaged K403 superalloy blades were repaired and remanufactured by a powder metallurgy repairing process（china powder metallurgy, CPM）, using nickel-based superalloy powder containing a small amount of B alloy and nano-Ni powder separately. X-ray diffraction, scanning electronic microscope（SEM）, EDX, and EPMA electro-probe were employed to investigate the phase composition, morphology and microstructure of the repaired areas. Meanwhile, performances of repairing areas and interface bonding were evaluated. Finally, the mechanism on the densification of repairing areas and the bonding of interface were also examined. The results show that the damaged blades could be restored to the original shape and size by CPM process, using appropriate repairing powder. In addition, it shows better properties using B alloy powder addition for K403 repairing. The diffusion of element B plays a key role in the densification of repairing areas and bonding of interface, in which the reaction equation could be expressed as Ni m B n＋（Cr, W）→γ＋（Cr2,W）B2. According to calculation, in the CPM process, the concentration of element B in the interface could be decreased to below the eutectic concentration.