Fabrication of directional solidification components of nickel-base superalloys by laser metal forming  

作　　者：LipingFeng WeidongHuang DarongChen XinLin HaiouYang 

机构地区：[2]StateKeyLaboratoryofSolidificationProcessing,NorthwesternPolytechnicalUniversity,Xi＇an710072,China [3]StateKeyLaboratoryofTribology,TsinghuaUniversity,Beijing100084.China [4]StateKeyLaboratoryofTribology,TsinghuaUniversity,Beijing100084.China／StateKeyLaboratoryofSolidificationProcessing,NorthwesternPolytechnicalUniversity,Xi＇an710072,China

出　　处：《Journal of University of Science and Technology Beijing》2004年第2期169-172,共4页北京科技大学学报（英文版）

基　　金：This research was financially supported by the National High Technology Research and Development Program of China (No.2001AA337020);the Development Plan of State Key Fundamental Research of China (No. G2000067205-3)

摘　　要：Straight plates, hollow columns, ear-like blade tips, twist plates withdirectional solidification microstructure made of Rene 95 superalloys were successfully fabricatedon Nickel-base superalloy and DD3 substrates, respectively. The processing conditions for productionof the parts with corresponding shapes were obtained. The fabrication precision was high and thecomponents were compact. The solidification microstructure of the parts was analyzed by opticalmicroscopy. The results show that the solidification microstructure is composed of columnardendrites, by epitaxial growth onto the directional solidification substrates. The crystallographyorientation of the parts was parallel to that of the substrates. The primary arm spacing was about10 mum, which is in the range of superfine dendrites, and the secondary arm was small or evendegenerated. It is concluded that the laser metal forming technique provides a method to manufacturedirectional solidification components.Straight plates, hollow columns, ear-like blade tips, twist plates withdirectional solidification microstructure made of Rene 95 superalloys were successfully fabricatedon Nickel-base superalloy and DD3 substrates, respectively. The processing conditions for productionof the parts with corresponding shapes were obtained. The fabrication precision was high and thecomponents were compact. The solidification microstructure of the parts was analyzed by opticalmicroscopy. The results show that the solidification microstructure is composed of columnardendrites, by epitaxial growth onto the directional solidification substrates. The crystallographyorientation of the parts was parallel to that of the substrates. The primary arm spacing was about10 mum, which is in the range of superfine dendrites, and the secondary arm was small or evendegenerated. It is concluded that the laser metal forming technique provides a method to manufacturedirectional solidification components.

关 键 词：laser multi-layer cladding laser metal forming directional solidification single crystal 

分 类 号：TG132.33[一般工业技术—材料科学与工程] TG111.4[金属学及工艺—合金]