张子阳,王善林,柯黎明,李娟.电子束扫描波形对铝锂合金显微组织及力学性能的影响[J].稀有金属材料与工程,2018,47(7):2245~2251.[ZHANG Ziyang,WANG Shanlin,KE Liming,Li juan.Effect of scanning mode on Microstructure and mechanical properties of 2198 Al-Li alloy joint fabricated by electron beam welding[J].Rare Metal Materials and Engineering,2018,47(7):2245~2251.]
电子束扫描波形对铝锂合金显微组织及力学性能的影响
投稿时间:2016-06-17  修订日期:2016-12-05
中文关键词:  铝锂合金  真空电子束焊  焊缝成形  力学性能
基金项目:国家自然科学基金(51461031)、江西省教育厅基金(GJJ150733,GJJ14539),轻合金加工科学与技术国防重点实验室基金(gf201501005),江西省自然科学基金(20132BAB216024)
中文摘要:
      铝锂合金被认为是在航空航天领域中实现飞行器轻量化的理想结构材料之一。对1.8mm厚度的2198-T8态铝锂合金薄板进行真空电子束焊接,分析了不同扫描方式对焊缝成形及接头力学性能的影响,以及最优焊接工艺下焊接接头的显微组织与力学性能。结果表明:在工作距离为300mm、加速电压U=60kV、聚焦电流If=498mA以及电子束流Ib=6.8mA情况下,不添加扫描可获得成形良好且宏观气孔缺陷的焊接接头。相同参数条件下对比添加了扫描方式的焊接,得出焊接过程中添加三角波扫描时,焊接接头的硬度值和抗拉强度均得到了提高。焊接接头的平均抗拉强度为323.55MPa,其中最高抗拉强度可达到母材的71.5%,延伸率最高可达母材延伸率的86.8%,焊缝熔合区较整个焊缝区来说最为薄弱。
Effect of scanning mode on Microstructure and mechanical properties of 2198 Al-Li alloy joint fabricated by electron beam welding
英文关键词:aluminum-lithium alloy  Electron beam welding  Weld formation  mechanical property
英文摘要:
      Aluminum lithium alloy is considered to be one of the ideal materials for lightweight structural materials in the aerospace field. The 2198-T851 aluminum lithium alloy 1.8 mm thickness sheet of vacuum electron beam test,analysis the different scanning modes on weld forming and the influence of mechanical properties of joints, and under the optimal welding process welding joint microstructure and mechanical properties. The results show that the working distance is 300mm, the acceleration voltage is U=60kV, the focusing current is If=498mA ,the welding speed V=1200mm/min and the electron beam is Ib=6.8mA, the welding joint without the addition of scanning can obtain good forming and no macro porosity defects.Under the same conditions compared to other add scan mode of welding, derived welding in the process of adding triangle wave scanning, we can not only obtain the forming good macro porosity defects in the welded joints, and the welding joint of the hardness values and tensile strength is improved. The average tensile strength of welded joint is 323.55MPa, and the fracture strength of the joint is 71.5%, The extension rate is up to 86.8% of the elongation of base metal.which is the weakest part of the weld zone.
作者单位E-mail
张子阳 南昌航空大学轻合金加工科学与技术国防重点学科实验室 m15270808960@163.com 
王善林 南昌航空大学轻合金加工科学与技术国防重点学科实验室  
柯黎明 南昌航空大学轻合金加工科学与技术国防重点学科实验室  
李娟 南昌航空大学轻合金加工科学与技术国防重点学科实验室  
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