摘要
采用直流磁场辅助TIG焊进行铜-钢异种材料对接试验,分析了直流磁场对TIG焊接头微观组织及力学性能的影响。结果表明:当磁场强度B=10 mT时,接头外观形貌良好且焊缝无气孔等缺陷。随着磁场强度的增大,接头的抗拉强度呈先上升后下降的趋势。当B=10 mT时,接头抗拉强度最高,达到194.6 MPa,相比无磁场时增加了25.79%,接头熔合区的显微维氏硬度提升了8.8%。接头由钢母材、钢侧热影响区、钢侧熔合区、焊缝区、铜侧热影响区和铜母材组成。其中熔合区组织由球状大颗粒(Ⅰ层)与带状小颗粒(Ⅱ层)的铜-钢固溶体组成。当B=10 mT时,Ⅰ层球状富铁相出现明显团聚现象且其中包含的铜颗粒增多,旋涡状的(α+ε)双相组织变多且旋度增加,铁基体由网状变为小条状;Ⅱ层富铁相消失且(α+ε)双相组织的厚度变薄。熔合区(α+ε)双相组织旋度增加与富铁相的团聚起到机械咬合和增强第二相强化的效果,这是接头强度与硬度提升的原因。
The butt joint test of different materials of copper and steel was conducted by using DC magnetic field assisted TIG welding.The influence of DC magnetic field on the microstructure and mechanical properties of TIG welding joint was analyzed.The results show that when the magnetic field intensity B=10 mT,the appearance of the joint is good and the weld has no porosity and other defects.With the increase of magnetic field strength,the tensile strength of the joint first increases and then decreases.When B=10 mT,the tensile strength of the joint reached the highest(194.6 MPa),which increased by 25.79%compared with no magnetic field.The micro-vickers hardness of the joint fusion zone increased by 8.8%.The joint was composed of steel base material,steel side heat affected zone,steel side fusion zone,weld zone,copper side heat affected zone and copper base material.The fusion zone tissue from a large globular particles(Ⅰlayer)and strip granules(Ⅱlayer)of copper steel solid solution.When B=10 mT,Ⅰlayer spherical iron-rich phase appeared obvious reunion phenomenon and containing copper particles increased,gyrate(α+ε)bipolar tissue increasing much and curl,iron substrate from mesh into small strips;Ⅱlayer iron-rich phase disappeared and(α+ε)bipolar thickness of the organization thinned.The increase of the curl and the aggregation of Fe rich phase in the fusion zone enhanced the mechanical bite and the second phase strengthening.It is the reason that the strength and hardness of the joint improve.
作者
戎易
王德
陈益平
熊震宇
程东海
胡德安
邹鹏远
李文杰
RONG Yi;WANG De;CHEN Yiping;XIONG Zhenyu;CHENG Donghai;HU De’an;ZOU Pengyuan;LI Wenjie(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330036,China;School of Mechanical and Electrical Engineering,Nanchang University,Nanchang 330031,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第22期22137-22140,共4页
Materials Reports
基金
国家自然科学基金(51965045)。
关键词
直流磁场
双相组织
机械咬合
第二相强化
富铁相
DC magnetic field
bipolar organization
mechanical interlocking
second phase reinforcement
Fe rich phase
作者简介
戎易,南昌航空大学航空制造工程学院,硕士研究生。主要研究方向为异种金属材料焊接;熊震宇,1968年11月出生,中共党员,研究生学历,教授、博士、硕士生导师、江西省中青年骨干教师,江西省机械工程学会副理事长,江西省焊接学会副理事长。主要从事焊接机器人与自动化、焊接质量控制的研究工作。主持或参与国家“863”计划项目2项,国家自然科学基金项目2项,省部级项目多项。现任南昌航空大学副校长,xzyww@163.com。
