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焊后熱處理對(duì)鋁鋰合金電子束焊接頭組織與性能的影響
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南昌航空大學(xué)輕合金加工科學(xué)與技術(shù)國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室開(kāi)放課題研究基金 (gf201001001)


Influence of Post-Weld Heat Treatment on Microstructure and Mechanical Properties of Al-Li Alloy Electron Beam Welding Joint
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    摘要:

    對(duì)2090鋁鋰合金電子束焊接頭進(jìn)行焊后熱處理，熱處理工藝為530 ℃固溶0.5 h +190 ℃時(shí)效12 h。結(jié)果發(fā)現(xiàn)，焊接接頭的抗拉強(qiáng)度由焊態(tài)下的331 MPa提高到熱處理后的415 MPa，焊后熱處理使接頭的強(qiáng)度大大提高。金相組織觀察表明，鋁鋰合金電子束焊接頭經(jīng)過(guò)熱處理后焊縫晶粒形貌由焊態(tài)下的等軸樹(shù)枝晶轉(zhuǎn)變成等軸晶，并且在晶粒內(nèi)部和晶界處析出細(xì)小的強(qiáng)化相。XRD相結(jié)構(gòu)分析顯示接頭焊縫中的強(qiáng)化相主要為δ′(Al3Li)、T1(Al2CuLi)、β′(Al3Zr)等。TEM觀察證實(shí)，熱處理后2090鋁鋰合金接頭焊縫中析出了多量的球狀δ′相和針狀T1相。拉伸斷口分析表明，鋁鋰合金電子束焊接頭在焊態(tài)下為帶韌窩的穿晶斷裂，經(jīng)過(guò)熱處理后接頭斷裂模式轉(zhuǎn)變?yōu)檠鼐嗔选?/p>

    Abstract:

    2090 Al-Li alloy electron beam welding joints were heat treated after welding, and the heat treatment scheme was 530 °C quenching for 0.5 h + 190 °C artificial aging for 12 h. Results show that the strength of 2090 Al-Li alloy joint is from 331 MPa in the as-welded state to 415 MPa under the condition of post-weld heat treatment. Therefore, the post-weld heat treatment can increase the strength of Al-Li alloy joints greatly. The observation of joint microstructure demonstrates that the grain morphology of the weldment varies form equiaxed dendrites in as-welded state into equiaxed grains after heat treatment, and the fine strengthening phases precipitate within the grain and along the grain boundary. The XRD analysis of phase constituent indicates that the main strengthening phases in Al-Li weldment are δ′(Al3Li), T1(Al2CuLi) and β′(Al3Zr), etc. The TEM observation shows that after heat treatment, many strengthening phases of spheroidal δ′ and needle-like T1 precipitate in weld metal of 2090 Al-Li alloy joint, which contribute to the joint strength. The observation of joint tensile fracture shows that the Al-Li alloy electron beam welding joint presents the characteristic of transgranular ductile fracture in the as-welded state. After post-weld heat treatment, the Al-Li alloy welded joint presents the pattern of intergranular fracture

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王少剛,俞 曠,陳 忱,邢 麗.焊后熱處理對(duì)鋁鋰合金電子束焊接頭組織與性能的影響[J].稀有金屬材料與工程,2013,42(3):579~584.[Wang Shaogang, Yu Kuang, Chen Chen, Xing Li. Influence of Post-Weld Heat Treatment on Microstructure and Mechanical Properties of Al-Li Alloy Electron Beam Welding Joint[J]. Rare Metal Materials and Engineering,2013,42(3):579~584.]
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  • 收稿日期:2012-02-17
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