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TiAl基合金金屬型真空吸鑄成形方法研究
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Study on Vacuum Suction Casting for TiAl-Based Alloys
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NSCF(50271020, 50771041); Program of Excellent Team in Harbin Institute of Technology

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    摘要:

    提出了一種鈦鋁基合金金屬型真空吸鑄成形新方法，并通過數(shù)值模擬研究了TiAl基合金薄板、葉片的充型規(guī)律。研究表明，在真空吸鑄過程中，充型速度和石墨吸口直徑的增加，有利于充型分數(shù)的提高，另外石墨吸口直徑與反向充填出現(xiàn)的位置密切相關(guān)。在凝固過程中，合金從下而上逐層凝固，但隨著鑄型溫度的增加，凝固了的合金在金屬液中所占的比例減少。以數(shù)值模擬結(jié)果指導(dǎo)試驗，得到質(zhì)量良好的TiAl基合金薄板和葉片鑄件

    Abstract:

    A novel type of foundry method for TiAl-based alloy is presented in the present paper. The filling processes of Ti-47Al alloy sheet and blade have been studied via numerical simulation. The investigation results indicate that the filling fraction is enhanced by the increase of filling velocity and graphite throat diameter. The graphite throat diameter is the main parameter for the backward filling location in the process of vacuum suction casting. With the increase of mould temperature, the solid fraction is reduced. The alloy solidification begins from bottom to top. The TiAl sheet and the blade are produced by this method. The grain size of the sheet is in the range from 10 μm to 40 μm. There is no obvious shrinkage cavity

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蘇彥慶,葉喜蔥,郭景杰,傅恒志. TiAl基合金金屬型真空吸鑄成形方法研究[J].稀有金屬材料與工程,2009,38(9):1505~1508.[Su Yanqing, Ye Xicong, Guo Jingjie, Fu Hengzhi. Study on Vacuum Suction Casting for TiAl-Based Alloys[J]. Rare Metal Materials and Engineering,2009,38(9):1505~1508.]
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  • 收稿日期:2008-10-08
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