DD5合金钎焊前电阻焊定位界面成形及性能分析研究  

Analysis on the Forming of Positioning Interface in Pre-brazing Resistance Welding for DD5 Alloy and the Joint Performance

作　　者：盛红飞 邓黎鹏[1,2] 易润华 李海涛[2] 程东海 黄斌 SHENG Hongfei;DENG Lipeng;YI Runhua;LI Haitao;CHENG Donghai;HUANG Bin(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China;National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,Nanchang 330063,China;Room 417 of AECC South Industry Co.,Ltd.,Zhuzhou 412000,Hunan,China)

机构地区：[1]南昌航空大学航空制造工程学院,南昌330063 [2]南昌航空大学轻合金加工科学与技术国防重点学科实验室,南昌330063 [3]中国航发南方工业有限公司417室,湖南株洲412000

出　　处：《材料导报》2025年第9期137-141,共5页Materials Reports

基　　金：国家自然科学基金(51965045);南昌航空大学轻合金加工科学与技术国防重点学科实验室开放基金(EG201903453)。

摘　　要：本工作研究了某航空发动机DD5镍基单晶高温合金构件真空钎焊电阻焊定位界面成形及性能。以Φ3.0 mm×0.1 mm的GH3030箔片为微隙支点,采用直流电阻焊机进行焊接,研究等值双脉冲电阻焊工艺参数(焊接电流I_(1)=I_(2)、焊接时长t_(1)=t_(2)、焊接压力P)对微隙界面成形及力学性能的影响。结果表明,界面拉伸载荷随焊接时长及焊接压力的增加呈倒“V”形变化。在t_(1)=t_(2)=0.2 s、P=11.54 kN条件下,随焊接电流的增大,界面微隙定位点连接面逐渐增大、γ-Ni相枝晶组织的生长方向趋于一致、拉伸载荷逐渐增大,且TaC的大量析出使得在TaC的富集区出现孔洞缺陷。同时,当I_(1)=I_(2)=6.7 kA时,微隙界面拉伸载荷达到最大值8.63 kN,微隙尺寸为0.05 mm;当I_(1)=I_(2)>6.7 kA时,支点飞溅严重,力学性能大幅下降。单脉冲拉伸断口韧窝较小且有未焊合现象,等值双脉冲拉伸断口韧窝较大,断裂位置在热影响区。This work was focused on the forming and performance analysis of resistance welding positioning interface prior to vacuum brazing with respect to the DD5 nickel-based single crystal high-temperature alloy components of a certain type of aircraft engine.The GH3030 foil with a thickness of 0.1 mm was used as the microgap support point for welding and on a resistance welding machine.The influence of equivalent double pulse resistance welding process parameters(welding current I_(1)=I_(2),welding time t_(1)=t_(2),welding pressure P)on the formation and mechanical properties of the microgap interface was studied.The interfacial properties showed an inverted V-shaped trend with the increase of welding time and welding pressure.Under the conditions of t_(1)=t_(2)=0.2 s and P=11.54 kN,the rise of welding current resulted in a gradual increase of the area of interface microgap positioning point connection,the homogenization of the growth directions of theγ-Ni phases dendritic structure,and a gradual increase of tensile load.As a large amount of TaC precipitates,pore defects appeared in the enriched area of TaC.When I_(1)=I_(2)=6.7 kA,the tensile load at the microgap interface reached its maximum of 8.63 kN,with a microgap size of 0.05 mm.When I_(1)=I_(2)>6.7 kA,the supporting GH3030 splashed severely and the mechanical properties decreased significantly.The single-pulse tensile fracture had a small dimple with incomplete welding defects observed,while the equivalent double-pulse tensile fracture had a larger dimple and located in the heat-affected zone.

关 键 词：DD5镍基单晶高温合金 电阻焊 微隙 钎焊 

分 类 号：TG453.9[金属学及工艺—焊接]