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7050鋁合金軟接觸連鑄扁錠裂紋抑制原因分析
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Analysis on Hot Cracking Depression Reasons for 7050 Aluminum Alloy Slab by Soft-Contact Continuous Casting
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國(guó)家自然科學(xué)基金(50675148)；山西省重點(diǎn)實(shí)驗(yàn)室開放基金(2007031014)；山西省回國(guó)留學(xué)人員科研項(xiàng)目(2008-39)

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    摘要:

    7050鋁合金軟接觸電磁連鑄過程中的電磁場(chǎng)能促使熔體產(chǎn)生受迫流動(dòng)，改善鑄坯質(zhì)量，抑制微裂紋。電磁場(chǎng)一方面通過均勻溫度場(chǎng)降低內(nèi)應(yīng)力或應(yīng)變，使金屬高溫脆性區(qū)主要處于受壓狀態(tài)，減少了熱裂紋形成的外部誘因；另一方面，通過細(xì)化組織，減小不可補(bǔ)縮區(qū)間，減少晶界低熔點(diǎn)化合物數(shù)量，降低了合金鑄錠的熱裂傾向性，從而達(dá)到了抑制鑄造裂紋的目的

    Abstract:

    In the process of soft-contact electromagnetic continuous casting of 7050 aluminum alloy, the forced flow of molten melt is produced by the intermediate magnetic field, which can improve the microstructure and eliminate hot cracks. On one hand, the electromagnetic filed can reduce the external factors for hot cracking through improving the casting condition to decrease the temperature gradient, to release the thermal stress and strain and to make alloying brittleness zone mainly in the state of being compressed. On the other hand, it also can decrease the hot cracking tendency of alloys by reducing the size of unfeeding zone and decreasing the quantities of eutectic compounds of low melting point. As a result of the two facts above, the cracking of electromagnetic continuous casting slab is eliminated

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曹志強(qiáng),李廷舉,張紅亮,劉吉東,王家淳.7050鋁合金軟接觸連鑄扁錠裂紋抑制原因分析[J].稀有金屬材料與工程,2010,39(12):2222~2226.[Cao Zhiqiang, Li Tingju, Zhang Hongliang, Liu Jidong, Wang Jiachun. Analysis on Hot Cracking Depression Reasons for 7050 Aluminum Alloy Slab by Soft-Contact Continuous Casting[J]. Rare Metal Materials and Engineering,2010,39(12):2222~2226.]
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  • 收稿日期:2009-12-18
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