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復(fù)合電磁場(chǎng)作用下高溫合金錠的真空熔鑄技術(shù)研究
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國(guó)家自然科學(xué)基金 (50474055)


Vacuum Casting of Superalloy Ingots with Multi-electromagnetic Field
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    摘要:

    系統(tǒng)研究了在K417高溫合金真空熔鑄過(guò)程中施加由工頻交流電磁場(chǎng)和恒穩(wěn)直流電磁場(chǎng)組成的復(fù)合電磁場(chǎng)對(duì)高溫合金鑄錠凝固組織的影響。實(shí)驗(yàn)結(jié)果表明：在澆注完畢后同時(shí)施加60 A旋轉(zhuǎn)電磁場(chǎng)和290 A恒穩(wěn)直流電磁場(chǎng)的工藝條件下，由于恒穩(wěn)直流電磁場(chǎng)在金屬液面處產(chǎn)生的電磁制動(dòng)效應(yīng)可以抑制施加旋轉(zhuǎn)電磁場(chǎng)所引起的金屬液面的波動(dòng)，不僅避免了因金屬液面波動(dòng)太大而使鑄錠縮孔惡化的情況出現(xiàn)，而且大幅提高了旋轉(zhuǎn)電磁場(chǎng)在金屬液凝固過(guò)程中的作用范圍和效果，最終得到細(xì)小等軸晶比例達(dá)到96%、縮孔明顯改善的優(yōu)質(zhì)高溫合金鑄錠

    Abstract:

    The effect of multi-electromagnetic field on the K417 superalloy ingots solidification microstructure has been studied. The results show that during the solidification process of superalloy vacuum casting, the application of the multi-electromagnetic field, composed of rotary electromagnetic field with 60 A current and steady DC electromagnetic field with 290 A current, can increase the scope and effect of rotary electromagnetic field as well as improve the feeding conditions of ingots. The reason can be attributed to that the electromagnetic brake generated by DC electromagnetic field can suppress effectively the metal surface fluctuation generated by rotary electromagnetic field. As a result, the fine equiaxed grain fraction of ingots can be increased to 96 % and the shrinkage porosity of ingots can be greatly reduced

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金文中,李素芳,李廷舉,殷國(guó)茂.復(fù)合電磁場(chǎng)作用下高溫合金錠的真空熔鑄技術(shù)研究[J].稀有金屬材料與工程,2015,44(6):1546~1549.[Jin Wenzhong, Li Sufang, Li Tingju, Yin Guomao. Vacuum Casting of Superalloy Ingots with Multi-electromagnetic Field[J]. Rare Metal Materials and Engineering,2015,44(6):1546~1549.]
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  • 收稿日期:2014-06-18
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  • 在線發(fā)布日期: 2016-01-04
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