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抽拉速率對(duì)含Ru鎳基單晶高溫合金凝固組織的影響
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國家自然科學(xué)基金青年基金項(xiàng)目資助（50901046）


Effects of Withdrawal Rate on Solidification Microstructure of Single Crystal Ni-based Superalloy Containing Ruthenium
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    摘要:

    研究了不同抽拉速率對(duì)含Ru鎳基單晶高溫合金凝固組織的影響。結(jié)果表明，隨著抽拉速率的加快，單晶合金的鑄態(tài)組織由粗枝狀晶向細(xì)枝狀晶演變，枝晶干和枝晶間的g ￠相尺寸減少，合金元素的偏析降低，g-g ￠共晶含量減少，NiAl基b相含量逐漸降低。同時(shí)，抽拉速率對(duì)合金的相變溫度影響不大。

    Abstract:

    The effect of withdrawal rates on the solidification microstructure of a single crystal Ni-based superalloy containing ruthenium was investigated. The results show that with the increase of the withdrawal rate, the as-cast microstructure of the single crystal alloy transforms from coarse dendrite to fine dendrite. Meanwhile, the size of the g ￠ particles decreases, segregation of alloying elements for the dendrite and interdendritic regions tends to be reduced, the volume fraction of g-g ￠ eutectic and NiAl-based b phase decreases gradually. In addition, the withdrawal rate has little influence on the phase transformation temperature of the superalloy.

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劉麗榮,茆 亮,陳立佳,金 濤,胡壯麒.抽拉速率對(duì)含Ru鎳基單晶高溫合金凝固組織的影響[J].稀有金屬材料與工程,2011,40(12):2212~2215.[Liu Lirong, Mao Liang, Chen Lijia, Jin Tao, Hu Zhuangqi. Effects of Withdrawal Rate on Solidification Microstructure of Single Crystal Ni-based Superalloy Containing Ruthenium[J]. Rare Metal Materials and Engineering,2011,40(12):2212~2215.]
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  • 收稿日期:2010-12-25
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