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1420鋁鋰合金雙光點激光焊接頭組織性能
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國家 “十一五”預研資助項目(2006145)


Microstructure and Properties of Twin Spot Laser Welded Joints of 1420 Al-Li Alloy
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    摘要:

    在2 mm厚1420鋁鋰合金雙光點激光焊接試驗的基礎(chǔ)上，研究接頭的組織與性能。 對比分析單、雙光點激光焊接頭各區(qū)域的組織、顯微硬度及室溫拉伸力學性能，并觀察斷口形貌。結(jié)果表明：1420鋁鋰合金雙光點激光焊接頭組織與單光點激光焊接頭組織分布類似，從熔合區(qū)至焊縫中心依次是等軸細晶、柱狀晶和等軸樹枝晶，但較單光點接頭細化；雙光點激光焊接頭各區(qū)域硬度低于母材，但高于單光點激光焊接頭；雙光點激光焊接頭焊態(tài)抗拉強度較母材下降，但略高于單激光焊接頭，可達母材的86%

    Abstract:

    The microstructure and properties of the joint were studied, based on the trial of twin spot laser welding of 2 mm thick 1420 aluminium-lithium alloy. The characteristics of microstructure, micro-hardness, room-temperature tensile strength and fractography of both twin spot and single spot laser welded joints were compared. The results indicate that the microstructures of the joints by twin spot and single spot laser welding are similar. Equiaxed grains, columnar crystals, and equiaxed dendrite crystals can be found from fusion zone to the weld center in the twin spot welded joint, which are finer than that of single spot welded joint. The microhardness of twin spot laser welded joint is higher than that of single spot laser welded joint, but lower than that of base metal. Meanwhile, the tensile properties of twin spot laser welded joint is decreased to 86% of that of base metal, but a little higher than that of single spot laser welded joint

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楊 璟,李曉延,陳 俐,鞏水利,李巧艷.1420鋁鋰合金雙光點激光焊接頭組織性能[J].稀有金屬材料與工程,2011,40(5):871~874.[Yang Jing, Li Xiaoyan, Chen Li, Gong Shuili, Li Qiaoyan. Microstructure and Properties of Twin Spot Laser Welded Joints of 1420 Al-Li Alloy[J]. Rare Metal Materials and Engineering,2011,40(5):871~874.]
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  • 收稿日期:2010-05-20
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