Ni_(3)Al基高温合金IC10钎焊接头组织及性能  

Microstructure and property of Ni_(3)Al-based superalloy IC10 brazed joint

作　　者：李文文 李思思 陈波 任新宇 尚泳来 LI Wenwen;LI Sisi;CHEN Bo;REN Xinyu;SHANG Yonglai(Welding and Plastic Forming Division,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焊接与塑性成形研究所,北京100095

出　　处：《材料工程》2024年第12期37-43,共7页Journal of Materials Engineering

基　　金：国家科技重大专项项目(J2019-Ⅶ-0010-0150);国家自然科学基金项目(52201050)。

摘　　要：针对Ni_(3)Al基定向凝固高温合金IC10导向叶片长时服役后出现的烧蚀、裂纹等损伤,可采用钎焊修复技术修复这些损伤缺陷,缩短大修周期。采用自主设计的高性能钴基钎料CoCrNi(W,Al,Ti,Mo,Ta)-B对IC10合金进行钎焊连接。在1220℃钎焊温度下,研究不同预置钎焊间隙和保温时间对IC10合金接头组织和强度的影响。结果表明:钎料对IC10合金具有良好的钎焊性,钎焊过程中钎料合金与IC10母材发生反应及互扩散,使得钎缝宽度比预置间隙明显增大。钎缝基体形成与IC10母材相类似的γ+γ′双相组织,同时基体上分布着团簇状硼化物相。保温时间对接头组织和强度影响较小,而钎焊间隙对其影响显著,随预置钎焊间隙增大,接头强度不断提高,当预置钎焊间隙为0.15 mm时,接头在1000℃下的平均抗拉强度达到454 MPa,已接近IC10母材水平。从接头断口形貌分析,接头强度的提高主要归因于接头中白色硼化物相细小且弥散分布,裂纹扩展路径更曲折。For Ni_(3)Al-based superalloy IC10 turbine blades,some defects,such as cracks and ablations,would appear after long-term service.To shorten the overhaul period,the turbine blades can be repaired using the brazing technology.In this study,an independently designed Co-based filler alloy(CoCrNi(W,Al,Ti,Mo,Ta)-B)was used to join the IC10 superalloy.The effects of the brazing gap and the brazing time on the joint microstructure and mechanical properties were investigated.The results show that the designed filler alloy has good brazeability at 1220℃for IC10 superalloy.Because of the interreaction and mutual diffusion,the brazing seam is wider than the preset gap.Meanwhile,the matrix of brazing seam isγ+γ′dual phase which was similar to the IC10 base material.Because of the boron in the filler alloy,a large number of white borides are formed.The brazing holding time has little influence on the microstructure and strength of the joint,but the brazing seam has significant effect.With the brazing seam wider,the joint strength tested at 1000℃increases gradually.When the brazing seam is set at 0.15 mm,the joint strength is 454 MPa,which is close to that of the IC10 base material.According to the joint fracture morphology,the increase in joint strength is mainly due to the small and diffuse white boride phase in the joint,inducing the tortuous crack propagation path.

关 键 词：IC10合金 钎焊间隙 接头组织 高温强度 

分 类 号：TG454[金属学及工艺—焊接]