TLP扩散焊接工艺参数对GH5188高温合金接头微观组织及力学性能的影响  

Effect of TLP diffusion welding process parameters on microstructure and mechanical properties of GH5188 superalloy joint

作　　者：滕俊飞 李家豪 周惠焱 伍大为 徐海涛 林铁松[4] 黄永德[2] TENG Junfei;LI Jiahao;ZHOU Huiyan;WU Dawei;XU Haitao;LIN Tiesong;HUANG Yongde(Aeronautical Key Laboratory for Welding and Joining Technologies,AViC Manufacturing Technology Institute,Beijing 100024,China;School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China;Institute of Process Equipment and Control Engineering,Zhejiang University of Technology,Hangzhou 310014,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]中国航空制造技术研究院航空焊接与连接航空科技重点实验室,北京100024 [2]南昌航空大学航空制造工程学院,南昌330063 [3]浙江工业大学化工机械设计研究所,杭州310014 [4]哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨150001

出　　处：《航空学报》2024年第8期282-292,共11页Acta Aeronautica et Astronautica Sinica

基　　金：国防科技重大专项(J2019-VII-0012);国家自然科学基金(52065048);先进焊接与连接国家重点实验室开放课题(AWJ-22Z02)。

摘　　要：采用自主设计的KCo8钴基中间层对GH5188高温合金进行瞬间液相扩散连接,借助扫描电子显微镜(SEM)、能谱仪(EDS)及电子探针(EPMA)分析评估了瞬间液相扩散焊接工艺参数对接头微观组织的影响,探究了焊接工艺对接头的影响机理,采用电子万能试验机检测接头的力学性能进行评估并分析其断裂机理。结果表明,典型的接头主要由3种区域构成:GH5188合金(母材),M_(5)B_(3)、M_(3)B_(2)等析出相存在的扩散区和钴基固溶体构成的等温凝固区。扩散区的扩散行为与焊接工艺有关,随着焊接温度的升高或保温时间的延长,扩散区析出相的密集程度逐渐减小。最佳工艺参数为焊接温度1180℃,保温60 min,接头平均抗拉强度为1033 MPa,达到母材性能的96.5%,且断裂于母材,满足工程背景需求,并为GH5188 TLP扩散焊的广泛应用提供参考。The transient liquid phase diffusion bonding of GH5188 superalloy is carried out by using self-designed KCo8 cobalt-based interlayer.The effects of transient liquid phase diffusion welding process parameters on the microstructure of the joint are evaluated by means of Scanning Electron Microscope(SEM),Energy Dispersive Spectrometer(EDS)and Electron Probe Micro-Analyzer(EPMA).The influence mechanism of welding process on the joint is explored.Moreover,the mechanical properties of the joint are evaluated by electronic universal testing machine,and the fracture mechanism is analyzed.The results show that the typical joint is mainly composed of three regions:GH5188 alloy(Base Metal),diffusion zone of precipitated phases such as M_(5)B_(3)and M_(3)B_(2),and isothermal solidification zone composed of cobalt-based solid solution.The diffusion behavior of the diffusion zone is related to the welding process.With the increase of the welding temperature or the prolongation of the holding time,the density of the precipitated phase in the diffusion zone gradually decreases.The optimum process parameters are welding temperature of 1180℃and holding time of 60 min.The average tensile strength of the joint is 1033 MPa,which is 96.5%of the base metal,and is broken in the base metal,meeting the needs of the engineering background.This study provides a reference for the wide application of GH5188 TLP diffusion welding.

关 键 词：GH5188合金 TLP 焊接工艺 微观组织 机械性能 

分 类 号：V263.3[航空宇航科学与技术—航空宇航制造工程]