摘要
以C1,C2和C3作为奥氏体不锈钢A-TIG焊的活性剂,分析了不同活性剂对A-TIG焊微观组织和力学性能的影响。结果表明,在相同焊接参数下,3种活性剂均能增加焊缝熔深。其中涂敷活性剂C3时,所得焊缝的熔深增加最大,为不涂活性剂的3.11倍。与常规TIG焊相比,3种活性剂均有助于焊缝和熔合线附近晶粒的细化,提高了接头的抗拉强度和硬度。经扫描电镜能谱分析(EDS)发现活性剂中合金元素的加入改变了接头的元素含量,接头出现了Al,B元素。对于涂敷C2,C3活性剂的接头,焊缝和熔合线附近的晶粒细化是由于晶界强化及活性剂元素进入了焊缝,在液相结晶过程中形成化合物或中间相,阻碍位错的移动,增加形核率共同作用的结果。对于涂敷C1活性剂的接头,通过冶金反应,SiO 2会略微增加焊缝中的Si含量,促进FA凝固模式的发展,促进δ相的生成。
C1,C2 and C3 were used as activating flux for A-TIG welding of austenitic stainless steel.Effects of different activating flux on the microstructure and mechanical properties of A-TIG welding were analyzed.The results showed that under the same welding parameters,three kinds of activating flux could increase the weld penetration.When C3 was applied,the weld penetration increased the most,which was 3.11 times of that without C3.Compared with conventional TIG welding,three kinds of activators could contribute to refining the grains near the weld and fusion line,and improve the tensile strength and hardness of the joint.It was found by EDS that the addition of alloy elements in the activating flux changed the element content of the joint,and Al and B elements appeared in the joint.For joints coated with C2 and C3 activating flux,the grain refinement near the weld and fusion line was due to the interaction of grain boundary strengthening and the entry of activating flux elements into the weld,which formed compounds or mesophase during the liquid-phase crystallization process to hinder the dislocation movement and increase nucleation rate.For joints coated with C1 activating flux,SiO 2 slightly caused increase of Si content in the weld through metallurgical reaction,promoted the development of FA solidification mode and the formation ofδphase.
作者
付彧
任泽良
肖中
占国平
张成高
Fu Yu;Ren Zeliang;Xiao Zhong;Zhan Guoping;Zhang Chenggao(Jiujiang Haitian Equipment Manufacturing Co.,Ltd.,Jiujiang 332100,Jiangxi,China)
出处
《焊接》
2020年第4期56-60,64,共6页
Welding & Joining
关键词
不锈钢
A-TIG焊
微观组织
力学性能
stainless steel
A-TIG welding
microstructure
mechanical properties
