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Effect of thermal cycles on the laser beam welded joint of AA2060 alloys

机译：热循环对AA2060合金激光焊接头的影响

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摘要

The effects of the thermal cyclic aging treatment on the microstructure and mechanical properties of 2060 Al-Li alloy laser beam welded joints were investigated. Aging treatments were conducted at different temperatures and for different cycles. Test results showed that the tensile strength of the weld joints increased and the elongation slightly decreased after the thermal cycling treatment. It was also found that the heat affected zone (HAZ) of the welds exhibited a significant increase in microhardness, whilst the microhardness variation of the nondendrite equiaxed zone (EQZ) can be neglected. The strengthening effect of the thermal cycling became more obvious as the temperature and cycles increased. The highest strength of around 513 MPa (96% of the base metal) was obtained at the temperature of 180 degrees C. Reprecipitation of strengthening phases such as T1 in the HAZ at 180 degrees C was observed by TEM, which can be considered as the main reason for the strengthening effect of the aging treatment.
机译：研究了循环时效处理对2060 Al-Li合金激光束焊接接头组织和力学性能的影响。老化处理是在不同的温度和不同的周期下进行的。试验结果表明，经过热循环处理后，焊缝的抗拉强度增加，伸长率略有下降。还发现，焊缝的热影响区（HAZ）的显微硬度显着提高，而非枝晶等轴区（EQZ）的显微硬度变化可以忽略。随着温度和循环次数的增加，热循环的强化效果变得更加明显。在180摄氏度的温度下获得了约513 MPa的最高强度（96％的贱金属）。通过TEM观察到，在180摄氏度的热影响区中，诸如T1的强化相再沉淀，可以认为是加强时效处理效果的主要原因。

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  • 来源
    《Journal of Materials Research》 |2018年第20期|3439-3448|共10页
  • 作者

    Mao Ling; Jin Huijin; Ye Fan; Wang Feifei; Zheng Gang; Wu Sujun;

  • 作者单位

    Beihang Univ BUAA, Sch Mat Sci & Engn, Beijing 100191, Peoples R China;

    Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100191, Peoples R China;

    Beihang Univ BUAA, Sch Mat Sci & Engn, Beijing 100191, Peoples R China;

    Beihang Univ BUAA, Sch Mat Sci & Engn, Beijing 100191, Peoples R China;

    Principle Engineer State Nucl Power Technol Co Lt, Cent Res Inst, Beijing 102209, Peoples R China;

    Beihang Univ BUAA, Sch Mat Sci & Engn, Beijing 100191, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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