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基于三相模型的Al-4%Cu合金三維半連鑄圓錠的宏觀偏析數(shù)值模擬
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西北工業(yè)大學(xué)材料學(xué)院,西北工業(yè)大學(xué)材料學(xué)院,Simulation and Modeling of Metallurgical Processes,University of Leoben,A-,Austria,Simulation and Modeling of Metallurgical Processes,University of Leoben,A-,Austria,西北工業(yè)大學(xué)材料學(xué)院

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國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目(2016YFF0101301)


Numerical simulation for macrosegregation in the 3D ingot of Al-4%Cu aluminum alloy during direct-chill casting based on three-phase model
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State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an,State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an,Chair of Simulation and Modeling of Metallurgical Processes,Montan Universitaet Leoben, Leoben,Austria,State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an;China;Chair of Simulation and Modeling of Metallurgical Processes,Montan Universitaet Leoben, Leoben,Austria,

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    摘要:

    本文采用基于 Eulerian-Eulerian方法的等軸晶、柱狀晶以及熔體三相完全混合的凝固模型計(jì)算了三維半連鑄Al-4%Cu鋁合金圓錠的宏觀偏析。基于熱溶質(zhì)對流的基礎(chǔ)上,模型考慮了等軸晶的移動,以及柱狀晶對浮游等軸晶的捕獲,等軸晶和柱狀晶的相互競爭生長行為。模擬結(jié)果表明鑄錠底部出現(xiàn)了明顯的錐形負(fù)偏析區(qū)(CET轉(zhuǎn)變區(qū)域),鑄錠中心正偏析帶,毗鄰中心的負(fù)偏析區(qū),以及鑄錠1/2半徑處正偏析帶,總的偏析形態(tài)呈現(xiàn)W型,與鑄錠實(shí)際情況基本一致。此外,鑄造速度相較于澆注溫度對鑄錠宏觀偏析具有更大的影響。

    Abstract:

    A mixed three-phase solidification model based on Eulerian-Eulerian approach and volume average method for macrosegregation is applied to predict segregation in three dimensional ingot of Al-4%Cu aluminum alloy during direct chill casting (DC). In addition to the thermosolutal buoyancy flow, we consider the movement of equiaxed crystal, the capture of the equiaxed crystals by growing columnar tree trunks and the interaction and impingement between columnar and equiaxed crystals in the model. The results show that the cone zone of negative segregation is obviously observed at the bottom of ingot. Negative segregation is also observed adjacent to the center, whereas positive segregation obtained in the center and middle part of the radius. This W-type segregation profile is agreement with measured experimental data obtained from literatures. At the same time, the influence of pouring temperature and casting speed on macrosegregation are studied. It indicates that casting speed has a greater impact on segregation.

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羅海軍,介萬奇,鄭永健,吳孟懷,高志明.基于三相模型的Al-4%Cu合金三維半連鑄圓錠的宏觀偏析數(shù)值模擬[J].稀有金屬材料與工程,2018,47(10):3030~3037.[Luo Haijun, Jie Wanqi, Zheng Yongjian, WU Menghuai, Gao Zhiming. Numerical simulation for macrosegregation in the 3D ingot of Al-4%Cu aluminum alloy during direct-chill casting based on three-phase model[J]. Rare Metal Materials and Engineering,2018,47(10):3030~3037.]
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  • 收稿日期:2018-03-07
  • 最后修改日期:2018-04-04
  • 錄用日期:2018-04-26
  • 在線發(fā)布日期: 2018-11-08
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