两种钎料大间隙钎焊K465合金接头组织及性能

Microstructures and mechanical properties of K465 super alloy wide-gap brazed joints with two brazing filler metals

采用预填镍基合金粉的方法,分别采用一种钴基钎料和一种镍基钎料对K465镍基铸造高温合金进行了大间隙钎焊试验。结果表明,这两种钎料均能实现K465合金的大间隙钎焊。钴基钎料钎焊接头微观组织主要包括镍基合金粉颗粒、粉颗粒间Ni-Co基固溶体以及固溶体上分布着的灰色块状相M23(C,B)6和白色块状相M3B2。镍基钎料钎焊接头微观组织包括镍基合金粉颗粒、粉颗粒间Ni-Cr基固溶体以及分布在颗粒上和颗粒间的白色物相M3B2。钴基钎料钎焊接头900℃平均抗拉强度520 MPa,高于镍基钎料钎焊接头的488 MPa,两者均超过了母材强度的50%。

Wide-gap brazing experiments of K465 super alloy were conducted by pre-flling the Ni-based alloy powder and two kinds of brazing filler metals,a Co-based filler metal and a Ni-based filler metal.The results showed,sound joints were obtained by both tire two filler metals.The microstructure of the joint brazed with the Co-based filler metal was mainly composed of the Ni-based alloy powder particles,（Ni,Co） solid solution among particles and gray block-shaped phase M23（C, B）6 and white block-shaped phase M3B2.While the microstructure of tire joint brazed with the Ni-based filler metal was mainly composed of the Ni-bascd alloy powder panicles, （Ni.Cr） solid solution among particles and white block-shaped phase M3B2.The average tensile strength at 900℃ of the joints brazed with the Co-based filler metal was 520 MPa,while the average tensile strength at 900 ℃ of the joints brazed with the Co-based filler metal was only 488 MPa which still exceeded 50% of that of the K465 base metal.