纳米SiC颗粒对镁合金搅拌摩擦焊接头性能影响研究
Study on the effect of nano SiC on the properties of friction stir welded joints of magnesium alloy
高辉 1张楷 1林渊浩 1雷丹1
作者信息
- 1. 北京石油化工学院能源先进连接技术北京高校工程研究中心,北京 102617
- 折叠
摘要
为提高AZ31 镁合金焊接接头的综合性能,文章分别研究了无纳米SiC-1 道次、添加纳米SiC-1道次和SiC-4 道次的搅拌摩擦焊焊接接头,通过光学显微镜、显微硬度仪和拉伸试验机分析了焊接接头的微观组织与力学性能;利用电化学工作站研究了接头的腐蚀行为,采用扫描电镜、EDS和XRD分析了接头的腐蚀形貌、元素成分和物相组成.结果表明,搅拌摩擦焊焊接接头成形良好、无缺陷;接头焊核区组织为均匀的等轴状晶粒,焊接道次的增加可有效改善SiC颗粒的分布情况,异质形核位点的存在起到了晶粒细化的作用,提高了接头的力学性能;在3.5%NaCl溶液腐蚀试验中,含SiC颗粒的接头耐腐蚀性能提升,其中SiC-4 道次的接头耐腐蚀性能最佳.
Abstract
In order to improve the comprehensive performance of AZ31 magnesium alloy welded joints,the friction stir welded joints without nano-SiC-1 pass and with nano-SiC-1 pass and 4 passes were studied respectively.The microstructure and mechanical properties of the welded joints were analyzed by optical microscope,microhardness tester and tensile testing machine.The corrosion behavior of the joints was studied by electrochemical workstation.The corrosion morphology,element composition and phase composition of the joints were analyzed by scanning electron microscopy,EDS and XRD.The results show that the friction stir welding joint is well formed and has no defects.The microstructure of the weld nugget zone of the joint is uniform equiaxed grains.The increase of welding passes can effectively improve the distribution of SiC particles.The existence of heterogeneous nucleation sites plays a role in grain refinement and improves the mechanical properties of the joint.In the 3.5%NaCl solution corrosion test,the corrosion resistance of the joint containing SiC particles is improved,and the corrosion resistance of the SiC-4 pass joint is the best.
关键词
纳米SiC/搅拌摩擦焊/微观组织/力学性能/电化学腐蚀Key words
nano-SiC/friction stir welding/microstructure/mechanical properties/electrochemical corrosion引用本文复制引用
基金项目
&&(11000023T000002199202)
出版年
2024
NETL
NSTL
万方数据