金属学报  2006, Vol. 42 Issue (6): 591-598

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等轴球晶凝固多相体系内热溶质对流、补缩流及晶粒运动的数值建模 II．模型的应用

王同敏; 李廷举; 曹志强; 金俊泽; T Grimmig; A Buhrig-Polaczek; M Wu; A Ludwig

大连理工大学材料科学与工程学院三束材料改性国家重点实验室; 辽宁省原材料特种制备技术重点实验室; 大连 116024

MODELLING THE THERMO-SOLUTAL CONVECTION, SHRINKAGE FLOW AND GRAIN MOVEMENT DURING GLOBULAR EQUIAXED SOLIDIFICATION IN A MULTI-PHASE SYSTEM II. MODEL APPLICATION

Tongmin Wang

大连理工大学

王同敏; 李廷举; 曹志强; 金俊泽; T.Grimmig; A.Buhrig-Polaczek; M.Wu; A.Ludwig . 等轴球晶凝固多相体系内热溶质对流、补缩流及晶粒运动的数值建模 II．模型的应用[J]. 金属学报, 2006, 42(6): 591-598 .
, , , , , , , . MODELLING THE THERMO-SOLUTAL CONVECTION, SHRINKAGE FLOW AND GRAIN MOVEMENT DURING GLOBULAR EQUIAXED SOLIDIFICATION IN A MULTI-PHASE SYSTEM II. MODEL APPLICATION[J]. Acta Metall Sin, 2006, 42(6): 591-598 .

摘要 参考文献 相关文章 Metrics 全文: PDF(425 KB)   摘要: 利用等轴球晶三相凝固模型模拟了A356铝合金半固态浆料冷却斜槽法制备过程, 研究了晶粒密度、尺寸及固相分数的分布与工艺参数的关系. 结果表明, 在 斜槽浇注处晶粒形核密度最大, 在斜槽末端晶粒尺寸、固相分数最大, 在铸型 中这三者的最终分布大致均匀. 适当降低浇注温度有助于提高斜槽上形核密度 和固相分数及降低晶粒尺寸. 此外, 还模拟了热溶质对流及补缩流在Al-4%Cu (质量分数)合金等轴球晶凝固过程所起的作用, 以及晶粒运动及补缩流对合金 自由表面和宏观偏析形成的影响. 结果表明, 凝固初期热对流及补缩流为主导, 凝固中期热溶质对流为主导, 凝固后期补缩流为主导; 晶粒运动受阻程度直接 影响自由表面形状, 补缩流考虑与否导致完全不同的宏观偏析图. 实验测 得晶粒尺寸与模拟结果分布较相似, 但其绝对值存在较大差异. 关键词 ： 半固态,  宏观偏析,  自由表面     Abstract：The developed three-phase model of equiaxed globular solidification has been applied for two examples: (1) cooling channel process of semi-solid slurry of A356 aluminum alloy; (2) equiaxed globular solidification process of Al-4%Cu. In the example (1), the effects of processing parameters on the grain density, size and solid fraction have been studied. The cooling channel semi-solid slurry preparation process has been reproduced. The results show that, the grain density has its maximum at the pouring position of the cooling channel, the grain size and solid fraction have their maximum at the end of the cooling channel. Their distributions are almost uniform in the mold after rheocasting process. Decreasing proper pouring temperature is helpful to increase the grain density and solid fraction, and to decrease the grain size. In the example (2), the roles that thermo-solutal convection and feeding flow acted in the solidification have been studied. Thermal convection and feeding flow dominate the flow pattern at the beginning of solidification, thermo-solutal convection plays the important role at the middle of solidification and the feeding flow controls the end of solidification. Additionally, the effects of grain movement and feeding flow on the formation of free surface and macrosegregation have been studied. The results show that, the obstacle of grain movement directly affects the shape of free surface, and completely different macrosegregation maps are obtained in case of considering feeding flow and without. The developed model has been validated by comparing the grain size between the measurement and simulation. Key words： semi-solid    macrosegregation    free surface 收稿日期: 2005-09-29      ZTFLH:  TG249， TG291   服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 王同敏 李廷举 曹志强 金俊泽 T.Grimmig A.Buhrig-Polaczek M.Wu A.Ludwig 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y2006/V42/I6/591 [1] Ohno A. Solidification-The Separation Theory and Its Practical Applications. Berlin: Springer-Verlag, 1987: 15 [2] Aguilar J, Fehlbier M, Biihrig-Polaczek A. In: Kainer K U, ed., Proc 6th Int Conf Magnesium Alloys and Their Applications. Wolfsburg, 2004: 37 [3] Aguilar J, Grimmig T, Buhrig-Polaczek A. In: Kainer K U, ed., Proc 6th Int Conf Magnesium Alloys and Their Applications. Wolfsburg, 2004: 767 [4] Wu S, Wu X, Xiao Z. Acta Mater, 2004; 52: 3519 [5] Modigell M, Koke J. J Mater Process Technol, 2001: 111(1-3): 53 [6] Petera J, Kotynia M. Int J Heat Mass Transf, 2004; 47: 1483 [7] Wang T M, Yao S, Zhang X G, Jin J Z, Wu M. Lndwig A, Pustal B, Biihrig-Polaczek A. Acta Metall Sin, 2006; 42: 584 (王同敏,姚山,张兴国,金俊泽,Wu M,Ludwig A,Pustal B,Buhrig-Polaczek A．金属学报,2006;42:584) [8] Ludwig A, Wu M. Metall Mater Trans, 2002; 33A: 3673 [9] Wang T, Pustal B, Abondano M. Trans Nonferrous Met Soc, 2005; 15: 289 [10] Conley J G, Huang J, Asada J, Akiba K. Mater Sci Eng 2000; A285: 49 [11] Kaempfer Th U, Rappaz M. In: Sahm PRed., Proc 9th Conf on Modeling of Casting, Welding and Advanced Solidification Processes, Aachen, TMS, 2000: 640 [1] 张利民, 李宁, 朱龙飞, 殷鹏飞, 王建元, 吴宏景. 交流电脉冲对过共晶Al-Si合金中初生Si相偏析的作用机制[J]. 金属学报, 2023, 59(12): 1624-1632. [2] 冯苗苗, 张红伟, 邵景霞, 李铁, 雷洪, 王强. 耦合热力学相变路径预测Fe-C包晶合金宏观偏析[J]. 金属学报, 2021, 57(8): 1057-1072. [3] 姜巨福, 张逸浩, 刘英泽, 王迎, 肖冠菲, 张颖. RAP法制备AlSi7Mg合金半固态坯料研究[J]. 金属学报, 2021, 57(6): 703-716. [4] 吴春雷,李德伟,朱晓伟,王强. 电磁旋流水口连铸技术对小方坯凝固组织形貌和宏观偏析的影响[J]. 金属学报, 2019, 55(7): 875-884. [5] 王强, 王连钰, 李宏侠, 蒋佳伟, 朱晓伟, 郭占成, 赫冀成. 钢包出钢末期漩涡抑制机理探究及防漩设计[J]. 金属学报, 2018, 54(7): 959-968. [6] 李军, 夏明许, 胡侨丹, 李建国. 大型铸锭均质化问题及其新解[J]. 金属学报, 2018, 54(5): 773-788. [7] 陈光, 郑功, 祁志祥, 张锦鹏, 李沛, 成家林, 张中武. 受控凝固及其应用研究进展[J]. 金属学报, 2018, 54(5): 669-681. [8] 刘政, 陈志平, 陈涛. 坩埚尺寸和电磁频率对半固态A356铝合金浆料流动的影响[J]. 金属学报, 2018, 54(3): 435-442. [9] 沈厚发, 陈康欣, 柳百成. 钢锭铸造过程宏观偏析数值模拟[J]. 金属学报, 2018, 54(2): 151-160. [10] 王永金, 宋仁伯, 宋仁峰. 9Cr18合金半固态触变压缩变形行为及组织演变[J]. 金属学报, 2018, 54(1): 39-46. [11] 李军, 王军格, 任凤丽, 葛鸿浩, 胡侨丹, 夏明许, 李建国. 基于成分均匀化的层状铸造方法的实验与模拟研究[J]. 金属学报, 2018, 54(1): 118-128. [12] 康利梅,杨超,李元元. 半固态烧结法制备高强韧新型双尺度结构钛合金[J]. 金属学报, 2017, 53(4): 440-446. [13] 李军,葛鸿浩,GE Honghao,WU Menghuai,李建国. 基于热溶质对流及晶粒运动的柱状晶-非球状等轴晶混合三相模型*[J]. 金属学报, 2016, 52(9): 1096-1104. [14] 刘政,张嘉艺,罗浩林,邓可月. 混沌对流下的半固态A356铝合金初生相形貌演变研究*[J]. 金属学报, 2016, 52(2): 177-183. [15] 刘政, 刘小梅, 朱涛, 谌庆春. 低频电磁搅拌对半固态铝合金中稀土分布的影响[J]. 金属学报, 2015, 51(3): 272-280. Viewed Full text Abstract Cited   Shared      Discussed