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電磁連鑄和微合金化對(duì)5356鋁合金組織性能的影響
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大連理工大學(xué),大連理工大學(xué),大連理工大學(xué),大連理工大學(xué),大連理工大學(xué),大連理工大學(xué),大連理工大學(xué),大連理工大學(xué),大連理工大學(xué)

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TG146.2 1

基金項(xiàng)目:

國(guó)家自然科學(xué)基金資助項(xiàng)目（項(xiàng)目號(hào)51375071）；中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目（DOT12ZD205）


The effects of the EMC technology and micro-alloying to 5356-Al alloy
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Dalian University of Technology,Dalian University of Technology,Dalian University of Technology,Dalian University of Technology,Dalian University of Technology,Dalian University of Technology,Dalian University of Technology,Dalian University of Technology,Dalian University of Technology

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    摘要:

    本文研究了不同電源功率、拉坯速率和冷卻水量等參數(shù)以及微量Sc元素對(duì)5356鋁合金組織和性能的影響。結(jié)果表明，在電源功率10kw，拉坯速率8cm/min，冷卻水量1.7m3/h的工藝條件下，5356鋁合金具有最優(yōu)的表面和內(nèi)部質(zhì)量以及綜合力學(xué)性能，抗拉強(qiáng)度、伸長(zhǎng)率分別可達(dá)310.0MPa和16.3%，且鑄錠表面無明顯鑄造缺陷，邊部組織基本為等軸晶，心部組織呈破碎枝晶形態(tài)，第二相分布均勻。5356鋁合金合理的均勻化處理工藝參數(shù)為440℃?30h，空冷，均勻化處理后合金元素Mg的微觀偏析基本消除，在晶界連續(xù)分布的Al8Mg5相明顯回溶。微量的Sc元素顯著提高5356鋁合金的強(qiáng)度和塑性。實(shí)驗(yàn)證明，5356-Al 0.4wt.%Sc合金晶粒明顯細(xì)化，第二相數(shù)量減少，抗拉強(qiáng)度和伸長(zhǎng)率達(dá)330.0MPa和29.0%，分別提高6.5%和77.9%。

    Abstract:

    The effects of the different power, casting rate, quantity of cooling water and trace amount of Sc to 5356-Al alloy are investigated. The experiment shows 5356-Al alloy has the optimal surface and internal quality and tensile properties with the process parameters which the power is 10kw, the casting speed is 8-9cm/ min, the quantity of cooling water is 1.7m3/h. The tensile strength and elongation of 5356-Al alloy can be up to 310.0MPa and 16.3%, and the surface has no obvious casting defects. At the same time, the microstructure of the edge is equiaxed crystals basically, while the center is broken dendrite crystals with an uniform distribution of the second phases. Besides, the homogenization heat-treatment of 5356-Al alloy has also been established: 440℃?30h with the air cooling. After the homogenization heat-treatment, the micro-segregation of Mg has been eliminated basically and the phase Al8Mg5 which is distributing along the grain boundaries continuously dissolves significantly. In addition, trace amount of Sc can significantly improve the strength and plasticity of 5356-Al alloy. The experiment proves 5356-Al 0.4wt. %Sc alloy can refine the grain size and reduce the number of the second phase, the tensile strength and elongation can be up to 330.0MPa and 29.0%, which increased by 6.5% and 77.9% respectively.

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引用本文

邢清源,孟令剛,鄧亮,楊洪碩,甄麗玲,劉紅偉,房燦峰,樊建勛,張興國(guó).電磁連鑄和微合金化對(duì)5356鋁合金組織性能的影響[J].稀有金屬材料與工程,2016,45(2):487~492.[Xing Qingyuan, Meng Linggang, Deng Liang, Yang Hongshuo, Zhen Liling, Liu Hongwei, Fan Canfeng, Fan Jianxun, Zhang Xingguo. The effects of the EMC technology and micro-alloying to 5356-Al alloy[J]. Rare Metal Materials and Engineering,2016,45(2):487~492.]
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  • 收稿日期:2014-03-24
  • 最后修改日期:2014-05-04
  • 錄用日期:2014-05-15
  • 在線發(fā)布日期: 2016-07-19
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