γ⁃TiAl与Ti_(2)AlNb线性摩擦焊接头微观组织  

Microstructure of γ⁃TiAl and Ti_(2)AlNb linear friction welding joint

作　　者：杜随更[1,2] 胡弘毅 丁珂[1,2] Suigeng DU;Hongyi HU;Ke DING(Key Laboratory of High Performance Manufacturing for Aero Engine(Ministry of Industry and Information Technology),Northwestern Polytechnical University,Xi’an 710072,China;Engineering Research Center of Advanced Manufacturing Technology for Aero Engine(Ministry of Education),Northwestern Polytechnical University,Xi’an 710072,China;Sanhua R&D Center,Hangzhou 310018,China)

机构地区：[1]西北工业大学航空发动机高性能制造工业和信息化部重点实验室,西安710072 [2]西北工业大学航空发动机先进制造技术教育部工程研究中心,西安710072 [3]三花研究院有限公司,杭州310018

出　　处：《航空学报》2024年第13期258-265,共8页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(51675434);航空发动机及燃气轮机基础科学中心项目(P2022-A-IV-001-002)。

摘　　要：为促进γ-TiAl叶片与Ti_(2)AlNb轮盘异种材料整体叶盘线性摩擦焊接制造技术的发展,进行了全片层γ-TiAl与Ti_(2)AlNb的线性摩擦焊接,采用扫描电镜(SEM)、EBSD及拉伸试验方法对焊态及焊后热处理态焊接接头的微观组织及力学性能进行了分析。结果表明,焊合区及近区的相构成自TiAl侧至Ti_(2)AlNb侧在焊态下为γ相-α_(2)相-B2相;经过800℃/2 h AC焊后热处理后转变为γ相-α_(2)相+B2相-O+B2相;γ-TiAl侧热力影响区(TMAZ)发生了片层弯折变形,Ti_(2)AlNb侧TMAZ发生了晶粒细化及再结晶。经焊后热处理接头室温及650℃抗拉强度分别达到277 MPa和478 MPa。To promote the linear friction welding technology in manufacturing the dissimilar materials blisk of theγ-TiAl blades and Ti_(2)AlNb disc,linear friction welding ofγ-TiAl and Ti_(2)AlNb is studied.The microstructure and mechanical properties of the welded joints that are as welded and post weld heat treated were analyzed by SEM,EBSD and tensile testing.The results indicate that the phase composition of the welding zone from the TiAl side to the Ti_(2)AlNb side isγ-α_(2)-B2 as welded and changed intoγ-α_(2)+B2-O+B2 after 800℃/2 h AC post weld heat treatment.The Thermal and Mechanical Affected Zone(TMAZ)on theγ-TiAl side undergoes laminar bending deformation,while the TMAZ on the Ti_(2)AlNb side undergoes grain refinement and recrystallization.The tensile strength of the joints after post weld heat treatment reaches 277 MPa and 478 MPa at room temperature and 650℃,respectively.

关 键 词：摩擦焊 TIAL Ti_(2)AlNb 微观组织 整体叶盘 

分 类 号：V263[航空宇航科学与技术—航空宇航制造工程]