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有/無強(qiáng)制流動下定向凝固界面形貌的數(shù)值模擬研究
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國家自然科學(xué)基金重大項目(50331040,60171034)；西北工業(yè)大學(xué)基礎(chǔ)研究基金(G9KY101502)


Phase Field Simulation of the Interface Morphology during Directional Solidification in a Forced Flow/Free Flow
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    基于相場法對Ni-Cu合金的定向凝固過程進(jìn)行了數(shù)值模擬，對比研究了抽拉速度、溫度梯度對有/無強(qiáng)制流動下的凝固界面形貌的影響。結(jié)果表明，在強(qiáng)制流動的作用下，凝固界面向迎流方向傾斜生長；隨著強(qiáng)制流速的增大，胞晶增大，溝槽的傾斜深度也逐漸增大，并且胞晶間的深度差別增大；在流動條件下，隨著抽拉速度的增大，定向凝固界面演變模式為：平界面→深胞→淺胞→平界面，隨著溫度梯度的增大，凝固界面演化模式為：深胞→淺胞→平界面。此外，流動對凝固形成的胞晶一次間距產(chǎn)生重要影響

    Abstract:

    The directional solidification of Ni-Cu alloy was simulated numerically based on a phase filed method, and the effects of pulling speed and thermal gradient on the interface shape in a forced flow/free flow were studied comparatively. The results indicate that the growth of the solidification interface incline towards the upstream direction in the forced flow. With the forced flow velocity increasing, the cells become bigger, the inclination depth of grooves is increased gradually and the depth difference becomes more obvious. With the increase in the pulling speed, the morphological evolution mode of directional solidification is planar interface→deep cells→ shallow cellular→ planar interface, while with the increasing thermal gradients the morphological evolution mode is deep cells → shallow cellular → planar interface. In addition, the forced flow has a great effect on the primary spacing of cells formed by solidification

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陳 志,陳長樂,郝麗梅.有/無強(qiáng)制流動下定向凝固界面形貌的數(shù)值模擬研究[J].稀有金屬材料與工程,2010,39(12):2117~2121.[Chen Zhi, Chen Changle, Hao Limei. Phase Field Simulation of the Interface Morphology during Directional Solidification in a Forced Flow/Free Flow[J]. Rare Metal Materials and Engineering,2010,39(12):2117~2121.]
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  • 收稿日期:2009-12-21
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