金属学报  2011, Vol. 47 Issue (11): 1408-1417    DOI: 10.3724/SP.J.1037.2011.00354

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γ-TiAl基合金汽车排气阀吸铸充型过程水模拟

熊超, 马颖澈, 陈波, 刘奎, 李依依

中国科学院金属研究所, 沈阳 110016

WATER MODELING OF MOULD FILLING DURING SUCTION CASTING PROCESS OF AUTOMOTIVE EXHAUST VALVES OF γ-TiAl BASED ALLOYS

XIONG Chao, MA Yingche, CHEN Bo, LIU Kui, LI Yiyi

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

熊超 马颖澈 陈波 刘奎 李依依. γ-TiAl基合金汽车排气阀吸铸充型过程水模拟[J]. 金属学报, 2011, 47(11): 1408-1417.
, , , , . WATER MODELING OF MOULD FILLING DURING SUCTION CASTING PROCESS OF AUTOMOTIVE EXHAUST VALVES OF γ-TiAl BASED ALLOYS[J]. Acta Metall Sin, 2011, 47(11): 1408-1417.

摘要 参考文献 相关文章 Metrics 全文: PDF(5229 KB)   摘要: 熔模吸铸是一种经济的γ-TiAl基合金汽车排气阀成型方法, 但早期的吸铸气阀存在严重的气孔缺陷, 这种缺陷的产生与吸铸充型过程的合金液流动密切相关. 为了直接观察和测量γ-TiAl基合金汽车排气阀吸铸充型过程中合金液的形态和卷气现象, 采用水模拟实验模拟了3种充型压力控制方式, 两种壳型组合形式下气阀吸铸充型过程. 模拟结果表明, 利用壳型顶部通气孔粗略控制充型压力的普通吸铸过程存在严重的卷气现象; 精确控制充型压力的“下进气法”和“上排气法”, 充型流动平稳, 充气流量<1.7 m3/h或排气流量<1.5 m3/h时, 充型流动无卷气现象. 进行了γ-TiAl基合金汽车排气阀吸铸实验, 实验结果与水模拟结果吻合. 应用吸铸充型运动学原理对上述现象进行了讨论. 关键词 ： &gamma,  -TiAl基合金, 汽车排气阀, 吸铸, 水模拟     Abstract：Investment and suction casting represents a more cost effective route to produce automotive exhaust valves of γ-TiAl based alloys, but the castings have severe gas porosities in the preliminary suction casting. It has been conferred that the generation of the porosity defects in the castings is a result directly associated with the entrapped air during filling flow. In order to investigate the filling patterns and the entrapped air during the suction casting process of automotive exhaust valves of γ-TiAl based alloys, water modeling experiments have been done. The effect of three types of filling pressure control methods and two types of moulds on the filling patterns are systematically investigated in this paper. Results show that serious entrapped air occur during the filling flow with an rough pressure control method by means of the vents at the top of the moulds (called a general suction casting); Tranquil filling patterns are obtained under an accurate pressure control method (“gas charging” or “air leakage”), and if the gas charging flow is smaller than 1.7 m3/h or the air leakage flow is smaller than 1.5 m3/h, the entrapped air phenomenon disappear. Meanwhile, the general and the“air leakage” suction casting of TiAl automotive exhaust valves are implemented using the conclusions of the corresponding water modeling experiments, and the real casting results claim good qualitative agreement with that of the water modeling experiments. Finally, The reasonable explanation for the aforementioned results of the water modeling experiments is given using the filling kinetic principle of suction casting. Key words： gamma titanium aluminides    automotive exhaust valves    suction casting    water modeling 收稿日期: 2011-06-07      作者简介: 熊超, 男, 1979年生, 博士生 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 熊超 马颖澈 陈波 刘奎 李依依 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2011.00354      或      https://www.ams.org.cn/CN/Y2011/V47/I11/1408 [1] Clemens H, Kestler H. Adv Eng Mater, 2000; 2: 551 [2] Yamaguchi M, Inui H, Ito K. Acta Mater, 2000; 48: 307 [3] HartfieldWunsch S E, Sperling A A, Morrison R S, DowlingWE, Allison J E. In: Kim YW,Wagner R, Yamaguchi M eds., Gamma Titanium Aluminides. Warrendale, PA: Minerals, Metals and Materials Soc, 1995: 41 [4] Dowling W E, Donlon W T, Allison J E. In: Horton J, Baker I, Hanada S, Noebe R D, Schwartz D S eds., High–Temperature Ordered Intermetallic Alloys. Pittsburgh, PA: Materials Research Soc, 1995: 757 [5] Gebauer K. Intermetallics, 2006; 14: 355 [6] SmarslyW, Baur H, Glitz G, Clemens H, Khan T, Thomas M. In: Hemker K J, Dimiduk D M, Clemens H, Darolia R, Inui H, Larsen J M, Sikka V K, Thomas M, Whittenberger J D eds., Structural Intermetallics 2001, Warrendale, PA: Minerals, Metals and Materials Soc, 2001: 25 [7] Chandley G D. AFS Trans, 1976; 84: 37 [8] Chandley G D, Cargill D L. AFS Trans, 1990; 98: 413 [9] Giese S R, Dix L. AFS Trans, 1999; 107: 217 [10] Koitzsch R, Odenthal H J, Pfeifer H. Steel Res Int, 2007; 78: 473 [11] Buchholz A, Ji M S, Schmitz W, Engler S. In: Huglen R ed., Technical Session on Light Metals 1997, the 126th TMS Annual Meeting, Worrendale, PA: Minerals, Metals and Materials Soc, 1997: 1043 [12] Odenthal H J, Bolling R, Pfeifer H. Steel Res Int, 2003; 74: 35 [13] Zhao Z W, Gao Y, Zhang H. Spec cast Nonferrous Alloy, 2007; 27: 351 (赵志维, 高永, 张 虎. 特种铸造及有色合金, 2007; 27: 351) [14] Li C Y, Wu S P, Guo J J, Su Y Q, Bi W S, Fu H Z. J Mater Process Technol, 2006; 176: 268 [15] Tu X. Basic Theories and Method of Model Experiment. Xi’an: Northwestern Polytechnical University Press, 1989: 51 (屠 兴. 模型实验的基本理论与方法. 西安: 西北工业大学出版社, 1989: 51) [16] Bai Y F. PhD Thesis, Harbin Institute of Technology, 2002 (白云锋. 哈尔滨工业大学博士论文, 2002) [17] Xia T C. Engineering Fluid Mechanics. Shanghai: Shanghai Jiao Tong University Press, 2006: 5 (夏泰淳. 工程流体力学. 上海: 上海交通大学出版社, 2006: 5) [18] Dong X Q, Wang D, Wang C Z, Li Y H, Guo G S, Wang Y C, Liu Z M. Theory and Practice of Low Pressure and Counter Pressure Casting, 3rd Ed., Beijing: China Machine Press, 2003:124 (董秀琦, 王冬, 王承志, 李玉海, 郭广思, 王永臣, 刘志明. 低压及差压铸造理论与实践, 第三版. 北 京: 机械工业出版社, 2003: 124) [19] Zhou G Q, Yan Z Y, Xu S X, Zhang K B. Fluid Mechanics. Beijing: Higher Education Press, 1992: 88 (周光坰, 严宗毅, 许世雄, 章克本. 流体力学. 北京: 高等教育出版社, 1992: 88) [20] He L Q. 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