基于實驗與3D-CAFE法的高硅鋼鑄錠凝固行為

宋煒; 張炯明; 王順璽

doi:10.13374/j.issn2095-9389.2017.03.007

基于實驗與3D-CAFE法的高硅鋼鑄錠凝固行為

doi: 10.13374/j.issn2095-9389.2017.03.007

北京科技大學鋼鐵冶金新技術國家重點實驗室, 北京 100083

詳細信息

中圖分類號: TG142.71
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出版歷程
- 收稿日期: 2016-05-12

Solidification behavior of high-silicon steel based on experimental and 3D-CAFE method

State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要: 通過空冷和水冷實驗研究了高硅鋼的鑄態組織，發現高硅鋼鑄態組織主要由粗大的柱狀晶構成，水冷鑄錠中柱狀晶比例高達90%以上.依據鑄錠的化學成分和晶粒統計結果，確定了3D-CAFE法模擬所需的枝晶生長動力學系數及高斯分布等參數.采用CAFE法對不同冷卻條件下高硅鋼的凝固過程進行模擬研究，發現空冷鑄錠較水冷鑄錠的溫度場更均勻，糊狀區更寬闊；空冷鑄錠呈“過渡式”凝固，水冷鑄錠呈“分層式”凝固；空冷流場較水冷流場更穩定，凝固末期冒口處出現明顯的抽吸現象，而水冷模擬結果中未觀察到該現象.組織模擬結果發現，模擬得到的高硅鋼凝固組織無論是形貌還是晶粒尺寸都與實驗結果相一致；最后通過改變澆注溫度模擬研究了過熱度對高硅鋼凝固組織的影響，結果表明，隨著過熱度的降低，鑄錠中心等軸晶率提高，晶粒數量增加，晶粒尺寸變得細小.
- 硅鋼 /
- 凝固 /
- 溫度場 /
- 流動速率
Abstract: The as-cast structure of high-silicon steel ingots under different cooling conditions was studied in this paper. It is found that the as-cast structure of the ingot is formed mainly by coarse columnar crystals, especially in the water cooling ingot, and the ratio is reaches as 90%. The dendrite tip growth kinetic coefficients and Gauss distribution parameters for 3D-CAFE simulation were determined according to the compositions of high-silicon steel and the results of as-cast structure. Then the solidification process of high-silicon steel under different cooling conditions was simulated by 3D-CAFE method. The results show that the temperature field under air cooling is more uniform, the mushy zone is broader, and it exhibits a transitional solidification pattern, however, which shows a layered solidification pattern under water cooling. The flow field under air cooling is more stable than that under water cooling, there is a remarkable suction region within the feeder head of the air cooling ingot, and this phenomenon is not observed in the water cooling one. The CAFE results including both morphology and grain size show a good agreement with the results from experiments. Moreover, the influence of superheat on the solidification structures was researched to find that the ratio and quantity of equiaxed structures increase with the decrease of the superheat, and the grain size becomes finer.
- silicon steel /
- solidification /
- temperature field /
- flow rate

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參考文獻(19)

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