交变磁场对TC4合金TIG焊接接头组织与性能的影响  

Effect of Alternating Magnetic Field on Microstructure and Properties of TC4 Alloy TIG Welded Joint

作　　者：秦彬皓 于鹏海 孙国立 弗拉基斯拉夫·哈斯金 张宇鹏 Qin Binhao;Yu Penghai;Sun Guoli;Khaskin Vladyslav;Zhang Yupeng(China-Ukraine Institute of Welding,Guangdong Academy of Sciences,Guangzhou 510615,China)

机构地区：[1]广东省科学院中乌焊接研究所,广州510615

出　　处：《机电工程技术》2025年第4期29-33,105,共6页Mechanical & Electrical Engineering Technology

基　　金：广东省科学院发展专项资金项目(2022GDASZH-2022010108,2020GDASYL-20200301001);国家科研项目(G2023030020L);国家重点研发计划资助项目(2020YFE0205300);广东省科技计划项目(2022B1212050001)。

摘　　要：为探究交变磁场对国产某型TC4钛合金窄间隙TIG焊接接头组织与性能的影响,深入探讨了焊接工艺对接头微观结构以及力学性能进行表征。实验结果表明焊缝及热影响区(HAZ)的初始微观组织由β相、α相及α'相构成。交变磁场在焊接过程中的影响显著,不仅影响强化相的生成和形态,还能通过促进熔池搅拌起到细化晶粒的作用。特别地,交变磁场有利于焊缝中马氏体的生成,在6.5 mT和10 Hz焊接参数下,焊缝组织中马氏体含量增加至8.97%,这一含量的增加对接头的力学性能产生了积极影响,使得接头强度达到了1 040 MPa,超出母材的强度,且断后伸长率达到6.9%,展现出良好的塑性。此外,接头显微硬度最大值均出现在HAZ区域,最大值达到355 HV,这一硬度值与焊缝中马氏体含量及形态有着直接的对应关系。综上所述,在6.5 mT和10 Hz的焊接参数下进行焊接,能够获得具有优良组织和综合力学性能的TC4钛合金接头,上述研究为焊接参数的选择和探究提供依据和参考。To explore the effects of an alternating magnetic field on the microstructure and properties of narrow-gap TIG welding joints of a certain domestic TC4 titanium alloy,the characterization of the welding process's impact on the joint's microstructure and mechanical properties is delved into.The experimental results reveal that the initial microstructure of the weld and the heat-affected zone(HAZ)is composed ofβ-phase,α-phase,andα'-phase.The influence of the alternating magnetic field during the welding process is pronounced,not only affecting the formation and morphology of the strengthening phases,but also refining the grains through the promotion of molten pool stirring.Particularly,the alternating magnetic field is conducive to the generation of martensite in the weld.Under the welding parameters of 6.5 mT and 10 Hz,the content of martensite in the weld structure increases to 8.97%,which positively influences the mechanical properties of the joint,resulting in a joint strength of 1040 MPa,surpassing the strength of the base material,and a tensile elongation of 6.9%,demonstrating good ductility.Additionally,the maximum microhardness values of the joint are observed in the HAZ,reaching a maximum of 355 HV,which correlates directly with the content and morphology of martensite in the weld.In summary,welding under the parameters of 6.5 mT and 10 Hz yields TC4 titanium alloy joints with superior microstructure and comprehensive mechanical properties.The research provides a basis and reference for the selection and exploration of welding parameters.

关 键 词：磁控窄间隙TIG焊接 TC4钛合金 焊接工艺 组织性能 

分 类 号：TG44[金属学及工艺—焊接]