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Microstructure evolution and mechanical behavior of Ni-based single crystal superalloy joint brazed with mixed powder at elevated temperature

查看全文 作　　者：Guanglei [1,2]Wang;Yuan [1]Sun;Xinguang [1]Wang;Jide [1]Liu;Jinlai [1]Liu;Jinguo [1]Li;Jinjiang [1]Yu;Yizhou [1]Zhou;Tao [1]Jin;Xudong [2]Sun;Xiaofeng [1]Sun 高影响力作者 机构地区：[1]Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;[2]School of Materials Science and Engineering, Northeastern University, Shenyang 110004, China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2017年第33卷第10期,共8页高影响力期刊 基　　金：financial supports from the National High Technology Research and Development Program of China (“863 Program”, No. 20102014AA041701);the National Natural Science Foundation of China (No. 11332010, No. U1508213, No. 51331005, No. 51401210, No. 51601192, No. 51671188 and No. 51571196) 摘　　要：Brazing of a Ni-based single crystal superalloy has been investigated with the additive Ni-based superalloy and filler Ni–Cr–W–B alloy at 1260℃, and attentions were paid to the microstructure evolution during brazing and the stress-rupture behavior at 980℃ of such brazed joints after homogenization. Microstructure in the brazed joint generally includes brazing alloy zone(BAZ), isothermally solidified zone(ISZ) and diffusion affected zone(DAZ). Microstructure evolution during this brazing process is discussed at the heating stage, the holding stage and the cooling stage respectively, according to the diffusion path of B atoms. Initially well-distributed γ’/γ’ microstructure in the homogenized bonded zone after heat treatment and substantial γ’ rafts enhance the post-brazed joint to obtain a stress-rupture lifetime of more than 120 h at 980℃/250 MPa. On the other hand, the decreased stress-rupture behavior of post-brazed joint, compared with parenting material, is ascribed to the presence of inside brazing porosity and stray grain boundary, which not only reduces the effective loading-carrying area but also offers preferential sites for creep vacancy aggregation to further soften stray grain boundary. And finally an early fracture of these post-brazed joints through the intergranular microholes aggregation and growth mode under this testing condition was observed. 关 键 词：Ni-based single crystal superalloy Mixed powder brazing Microstructure evolution Fracture behavior Brazing porosity
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