摘要
试验采用Ti51ZrNiCu钎料,实现了TA1/TC4异种钛合金的真空钎焊连接,使用扫描电子显微镜(Scanning electron microscope, SEM)、能谱分析仪(Energy dispersive spectrometer, EDS)及X射线衍射仪(X-ray diffraction XRD)等分析方法研究了焊接接头的界面组织,分别研究了钎焊与高温时效过程,明确了两个阶段对接头组织与性能的影响,并总结了焊接工艺参数及焊后高温时效处理对组织结构的影响规律。结果表明,TA1/Ti51ZrNiCu/TC4接头的典型界面组织结构为:TAl/α-Ti+β-Ti+(Ti,Zr)_(2)(Ni,Cu)/TC4,其中焊接参数对接头界面组织的影响较小,试验具有较宽的工艺窗口,而高温时效处理对界面组织及力学性能具有较大影响,即高温时效消除焊后脆性组织是获得高质量接头的关键。高温时效处理后,(Ti,Zr)_(2)(Ni,Cu)化合物含量降低,界面组织更加均匀,力学性能显著提高且具有更好的稳定性,在935℃/3 min焊接参数下,高温时效处理120 min后,获得最大抗拉强度为319 MPa的钎焊接头。
Ti51ZrNiCu filler alloy was used to vacuum braze TA1 alloy and TC4 alloy successfully.The interfacial microstructure of brazed joints was studied by scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and X-ray diffraction(XRD).The processes of brazing and high temperature treatment are researched respectively to illustrate the impact on interfacial microstructure and mechanical property.And the influences of brazing parameters and high temperature treatment on interfacial microstructure were summarized.The results showed the typical interfacial microstructure of TA1/TC4 joints was TAl/α-Ti+β-Ti+(Ti,Zr)_(2)(Ni,Cu)/TC4.Brazing parameters had less influences on the interfacial microstructure,which meant wider process window.Compared to brazing parameters,high temperature treatment had more influences on the interfacial microstructure,which is critical factor.After high temperature treatment,the(Ti,Zr)_(2)(Ni,Cu)phase reduced,which lead to the more uniform microstructure,higher and more stable mechanical property.The highest tensile strength of brazed joints was 319 MPa,which were obtained at 935℃for 3 min and high temperature treatment for 120 min.
作者
高德君
武绍旺
杨生旭
张承浩
周龙
司晓庆
李淳
亓钧雷
曹健
GAO Dejun;WU Shaowang;YANG Shengxu;ZHANG Chenghao;ZHOU Long;SI Xiaoqing;LI Chun;QI Junlei;CAO Jian(State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001;Xi'an Space Engine Company Limited,Xi'an 710100)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2024年第14期109-116,共8页
Journal of Mechanical Engineering
基金
国家自然科学基金杰出青年基金(52125502)
国家自然科学基金青年科学基金(52005031)
黑龙江省“头雁”团队经费(HITTY-20190013)资助项目。
