發(fā)布時(shí)間：2018-12-21 11:22

【摘要】：研究了硅對(duì)SAl5356焊絲及其焊接的5083鋁合金焊縫顯微組織及力學(xué)性能的影響.結(jié)果表明,Si元素含量在0~0.12%時(shí),隨著Si元素含量的增加,SAl5356焊絲及其焊接接頭強(qiáng)度稍有升高,塑性稍有下降;當(dāng)Si元素含量高于0.12%時(shí),隨著Si元素含量的增加,SAl5356焊絲及其焊縫組織中含硅粗大相增多,焊絲拉伸性能下降,硬度不均勻性加劇,焊接接頭強(qiáng)度及彎曲性能變差.特別是當(dāng)Si元素含量超過(guò)0.2%后,合金中含硅粗大相在晶界處富集,與α(Al)基體構(gòu)成魚骨狀共晶組織,焊絲及其焊接接頭力學(xué)性能下降更加明顯,鋁線材的強(qiáng)度比峰值下降了約12%,斷后伸長(zhǎng)率下降了約45%.因此從提高SAl5356焊絲及其焊縫性能角度考慮,Si元素含量不宜超過(guò)0.2%,以控制在0.12%以內(nèi)最佳.
[Abstract]:The effect of silicon on microstructure and mechanical properties of SAl5356 wire and 5083 aluminum alloy weld was studied. The results show that when the content of Si is 0 ~ 0.12, with the increase of Si content, the strength of SAl5356 wire and its welded joint increases slightly, and the plasticity decreases slightly. When the content of Si is higher than 0.12, with the increase of Si content, the content of silicon in the structure of SAl5356 welding wire and its weld increases, the tensile property of the wire decreases, the hardness inhomogeneity intensifies, and the strength and bending properties of the welded joint become worse. Especially when the content of Si is more than 0.2%, the coarse silicon-containing phase in the alloy is enriched at grain boundary, and the fishbone eutectic structure is formed with 偽 (Al) matrix, and the mechanical properties of welding wire and welded joint decrease more obviously. The strength of the aluminum wire is about 12 percent lower than the peak, and the elongation after break is about 45 percent. Therefore, from the point of view of improving the properties of SAl5356 welding wire and weld, the content of Si element should not exceed 0.2%, so that the content of Si element should be controlled within 0.12%.
【作者單位】： 南京航空航天大學(xué)材料科學(xué)與技術(shù)學(xué)院;浙江宇光鋁材有限公司;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51375233) 江蘇高校優(yōu)勢(shì)學(xué)科建設(shè)工程資助項(xiàng)目
【分類號(hào)】：TG457.14;TG407

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