闫德俊,李海洋,刘晓莉,钟美达,罗玖强,粱志敏.船用5083铝合金变极性等离子焊接头组织和性能[J].稀有金属材料与工程,2018,47(10):3161~3166.[YAN De-jun,LI Hai-yang,LIU Xiao-li,ZHONG Mei-da,LUO Jiu-qiang,LIANG Zhi-min.Microstructure and Mechanical Properties of Variable Polarity Plasma Arc Welded of 5083SAluminumSAlloySfor Shipbuilding[J].Rare Metal Materials and Engineering,2018,47(10):3161~3166.]
船用5083铝合金变极性等离子焊接头组织和性能
投稿时间:2016-11-29  修订日期:2018-08-03
中文关键词:  5083铝合金  变极性等离子焊  显微组织  力学性能
基金项目:中国博士后科学基金资助项目(2016M590821),国防科学技术工业基础研究项目(A0720133002),黄埔区科技计划项目(201518),河北省自然科学基金(E2016208077)
中文摘要:
      采用变极性等离子焊接工艺实现了5mm厚船用5系铝合金立向上位置焊接,并分析了接头的组织和力学性能。力学试验显示:接头抗拉强度达到295MPa,延伸率达到10%,断裂位置在熔合线附近;焊缝区和热影响区的显微硬度均低于母材,且焊缝中心处最低。接头金相观察发现熔合线附近的焊缝为粗大的等轴晶组织,但焊缝区大部分为胞状树枝晶组织,从两侧呈对称生长并在焊缝中心处相遇,热影响区为再结晶组织。利用电子探针分析了拉伸断裂位置附近成分,发现该区域Mg含量偏低且分布不均匀,固溶强化效果下降,组织和成分的不均匀导致该区域成为接头的薄弱环节。
Microstructure and Mechanical Properties of Variable Polarity Plasma Arc Welded of 5083SAluminumSAlloySfor Shipbuilding
英文关键词:5083 aluminum alloy  variable polarity plasma welding  microstructure  mechanical properties
英文摘要:
      5000 series (Al-Mg) aluminum alloy for shipbuilding with thickness of 5mm was successfully welded by variable polarity plasma welding process at vertical-up position. The microstructure and mechanical properties of the joint were investigated. The ultimate tensile strength of the joint was 295MPa, the elongation was 10%, and the location of fracture was near the partly melted zone. The micro hardness of fusion line and heat affected zone was lower than the base metal, and the lowest hardness appeared in the center of the weld. The optical micrographs of the joint shown that the weld microstructure near the fusion line was coarse equiaxed grain structure and most of the weld region was cellular dendritic structure which grown from the two sides to the middle, while the microstructure of heat affected zone was typical recrystallization structure. The composition around the tensile fracture position was analyzed by EPMA, and the results revealed that the content of Mg was low and heterogeneously distributed. The lack and segregation of Mg and non-homogeneous microstructure decreased solution strengthening and resulted in a weak zone of the joint.
作者单位E-mail
闫德俊 中船黄埔文冲船舶有限公司 yandejun_2003@163.com 
李海洋 河北科技大学  
刘晓莉 中船黄埔文冲船舶有限公司  
钟美达 中船黄埔文冲船舶有限公司  
罗玖强 中船黄埔文冲船舶有限公司  
粱志敏 河北科技大学  
摘要点击次数: 14
全文下载次数: 8
查看全文  查看/发表评论  下载PDF阅读器
关闭