摘要
为了解决2195铝锂合金在焊接时裂纹敏感性高、焊接头软化等问题,通过调整焊丝的化学成分,添加微米级原位自生TiB_(2)颗粒,制备出BJ-4210焊丝,并对焊接头的抗裂性、力学性能及显微组织进行了研究。研究表明,TiB_(2)颗粒在熔池中作为形核质点,能够降低焊缝晶粒尺寸并且改变晶粒形态,从而有效的降低接头的裂纹敏感性,提高接头的力学性能,其拉伸强度达到370 MPa,延伸率为3.1%。BJ-4210焊丝的研制可为2195铝锂合金的工程应用提供技术支撑。
The BJ-4210 wire was prepared by adjusting the chemical composition and adding micron in-situ TiB_(2) particles to solve the problems of high crack sensitivity and softening of welding joint during welding of 2195 aluminum-lithium alloy.In this paper,the crack sensitivity,mechanical properties and microstructure of joint were investigated.The results show that the TiB_(2) particles,as the nucleation point,can reduce the size of weld grain and changes the morphology of the grain,which can effectively reduce crack sensitivity of the joint and improve its mechanical properties.The tensile strength of joint is 370 MPa,while the elongation of joint is 3.1%.The research of BJ-4210 wire provids technical support for the engineering application of 2195 aluminum-lithium alloy.
作者
温斯涵
周炼刚
孙建秋
焦好军
吴素君
WEN Sihan;ZHOU Liangang;SUN Jianxiu;JIAO Haojun;WU Sujun(Aerospace Research Institute of Materials&Processing Technology,Beijing 100076;School of Materials Science and Engineering,Beihang University,Beijing 100191)
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2021年第4期131-135,共5页
Aerospace Materials & Technology
关键词
铝锂合金
焊丝
裂纹敏感性
力学性能
微观组织
Al-Li alloy
Weld filler wire
Crack sensitivity
Mechanical property
Microstructure
