摘要
制备了3种不同合金成分的TiO_2-MgO-Al_2O_3熔渣体系自保护药芯焊丝,研究焊缝熔敷金属性能,得到工艺性能较好的T50SS-3药芯焊丝。采用X射线探伤、金相显微镜、SEM等测试方法,研究药芯焊丝的焊缝宏观、微观组织、断口形貌及夹杂物分布、尺寸和成分。结果表明,焊缝无未焊透、咬边、气孔、夹渣等缺陷,微观组织主要为低分散型贝氏体+少量铁素体,中间为奥氏体颗粒,非金属夹杂为锆的氧化物为形核中心形成铝的氮化物,弥散均匀分布。
Three kinds of TiO2-MgO-Al2O3 slag system self-shielded flux-cored wires with different components are used to study the properties of the deposited metal,and the T50SS-3 flux-cored wire is obtained. The X ray inspection,metallographic microscope,SEM are used to study the properties of tile welded joints,ineluding the maerostmeture,mierostructm＇e and fracture appearance of the wehls,and the distribution,size and composition of the inclusions. The results show that there are no dects such as lack of penetration,undercut,pores, slag and so on in the welds. The microsh：ucture bchmgs to low dispersion bainite ＋ a small amount of ferrite,intermediates are austenite grains,non-metallic inclusions are aluminunl nitride,whose the nucleation occurs with zirconia,and distribute uniformly.
作者
刘凤美
易江龙
郭春富
万娣
牛犇
王键益
LIU Fengntei YI Jianglong GUO Chmffu WAN Di NIU Ben WANG Jianyi(Guangdong Wehting Instilule（China-Ukraine E. O. Paton Institute of Welding）, Key LaboratoU of Guangdong Province of Modern Wehling Technology,Guangzhou 510650, China)
出处
《电焊机》
2017年第9期115-119,共5页
Electric Welding Machine
基金
广州市科技计划项目(201508030024)
广东省科学院项目(2016GDASPT-0205)
广东省项目(2012A061400011
2015B050502005
2014B050503004)
关键词
X70管线钢
自保护焊接
药芯焊丝
微观组织
非金属夹杂
X70 pipeline steel
self-shield welding
flux-cored wire
microstruelure
non-metallic inclusion
