采用BNi-5钎料钎焊K417G高温合金的界面组织和力学性能  

Interfacial microstructure and mechanical properties of K417G superalloy brazed with BNi-5 brazing filler metal

作　　者：周标 王浩 任新宇 邱嘉玉 潘晖 Zhou Biao;Wang Hao;Ren Xinyu;Qiu Jiayu;Pan Hui(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]中国航发北京航空材料研究院,北京100095

出　　处：《焊接》2023年第12期12-16,共5页Welding & Joining

基　　金：国家自然科学基金资助项目(52201050)。

摘　　要：K417G镍基高温合金具有优异的高温力学性能,可应用于航空发动机热端部件的制造中。采用BNi-5镍基钎料开展了K417G合金钎焊接头的研究,分析了不同保温时间对钎焊接头微观组织演变和接头高温力学性能的影响。在1160℃保温15 min条件下,K417G合金接头界面处物相主要由γ+γ’相、富Ti碳化物相和(Ni,Cr)_(3)Si相等物相组成。随着保温时间的进一步延长,界面反应和元素扩散更为充分;同时接头中的硅化物相分布呈分散趋势,物相尺寸得到细化。1160℃×30 min条件下获得的接头950℃平均抗拉强度为412 MPa。K417G nickel-based superalloy has excellent high-temperature mechanical properties and can be applied in the manufacturing of hot end components of aircraft engines.Brazed joints of K417G alloy were studied by BNi-5 nickel-based brazing filler metal.Effects of different holding time on microstructure evolution and high-temperature mechanical properties of brazed joints were analyzed.At 1160℃for 15 mins,phases at interface of K417G alloy brazed joints were mainly composed ofγ+γ'phase,Ti-rich carbide phase and(Ni,Cr)_(3)Si phase.With the further extension of holding time,interfacial reaction and element diffusion became more sufficient.Meanwhile,distribution of silicide phase in brazed joints showed a dispersion trend,and phase size was refined.At 1160℃for 30 mins,average tensile strength of brazed joints at 950℃was 412 MPa.

关 键 词：高温合金 钎焊 微观组织 高温性能 

分 类 号：TG454[金属学及工艺—焊接]