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Beam scanning effect on properties optimization of thick-plate 2A12 aluminum alloy electron-beam welding joints

机译：束流扫描对厚板2A12铝合金电子束焊接接头性能优化的影响

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摘要

Electron-beam welding (EBW) of a 25-mm-thick 2A12 aluminum alloy was performed. Obvious concave defect was detected at the upper surface of welded joint. The grains in weld were coarse, which reduced the strength of the joint via conventional EBW (CEBW). The tensile strength of the joint was 292 MPa, which reached 64% of the tensile strength of the base metal. Therefore, beam scanning was conducted during the EBW. With the addition of beam scanning, the dendrites near the fusion line were broken, the grains were refined, and the strength was enhanced. Additionally, the welding process tended to be stable, and the formation of the weld joint was improved. The eutectic at the grain boundaries reduced the strength of the joint. There was no obvious preferential growth orientation in the fusion zone (FZ) during crystallization, and the distribution of the grain was more uniform. The number of small-angle grain boundaries increased, which was conducive to the precipitation of the secondary phase. Compared with the case of CEBW, the width of the FZ increased from 2 to 4 mm, and the microhardness was basically unchanged. The average tensile strength of the joint increased by 31.2%, to 383 MPa. Moreover, the fatigue strength of the joints satisfied the engineering requirements.
机译：对厚度为25mm的2A12铝合金进行电子束焊接（EBW）。在焊接接头的上表面检测到明显的凹形缺陷。焊缝中的晶粒较粗，这通过传统的EBW（CEBW）降低了接头的强度。接头的抗拉强度为292 MPa，达到母材抗拉强度的64％。因此，在EBW期间进行了光束扫描。通过添加束扫描，熔合线附近的树枝状晶体被破坏，晶粒细化，强度得到增强。另外，焊接过程趋于稳定，并且改善了焊接接头的形成。晶界处的共晶降低了接头的强度。结晶过程中，熔合区（FZ）没有明显的优先生长取向，晶粒的分布更均匀。小角度晶界的数量增加，这有利于第二相的析出。与CEBW的情况相比，FZ的宽度从2mm增加到4mm，并且显微硬度基本不变。接头的平均抗拉强度增加了31.2％，达到383 MPa。而且，接头的疲劳强度满足工程要求。

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  • 来源
    《Materials Science and Engineering》 |2019年第28期|583-592|共10页
  • 作者

    Chen Guoqing; Liu Junpeng; Shu Xi; Gu Hua; Zhang Binggang; Feng Jicai;

  • 作者单位

    Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Molten pool scanning; Second-phase strengthening; Mechanical property; Microstructures;

    机译：熔池扫描;第二相强化;力学性能;显微组织;

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