Modeling of Filling and Solidification Process for TiAl Exhaust Valves During Suction Casting

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	Modeling of Filling and Solidification Process for TiAl Exhaust Valves During Suction Casting
	C. Xiong; Y. C. Ma; B. Chen; K. Liu; Y. Y. Li
	2013
发表期刊	Acta Metallurgica Sinica-English Letters
ISSN	1006-7191
卷号	26 期号:1 页码:33-48
摘要	Investment and suction casting (ISC) represents an economic and promising process route to fabricate automotive exhaust valves of gamma-TiAl based alloys, but information available on the metal flow and the temperature changes during mould filling and solidification process for the ISC process is meager. A sequentially coupled mathematical flow-thermal model, based on the commercial finite-volume/finite-difference code FLOW-3D and the finite- element code PROCAST, has been developed to investigate the ISC process. In term of calculating the flow and temperature fields during the filling and solidification stages, potential defects including the gas bubbles and the surface air entrainment occurred in the mould filling process and the shrinkage porosities formed in the solidification process are predicted and the reasons for the formation of these defects' are also analyzed. The effects of filling pressure difference control methods and moulds on gas bubble and surface air entrainment behavior are presented. It is found that by changing the filling pressure difference control methods from general suction casting to "air leakage" suction casting and reducing air leakage flow rates, the gas bubbles are eliminated effectively, and the surface air entrainment attenuate dramatically. With resort to a mould with a tetragonal runner, the surface air entrainment decrease to the lowest level. Finally, the water analogue and suction casting experiments of exhaust valves are implemented for further validation of the simulation results.
部门归属	[xiong, chao ; ma, yingche ; chen, bo ; liu, kui ; li, yiyi] chinese acad sci, inst met res, shenyang 110016, peoples r china. ; ma, yc (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china. ; ycma@imr.ac.cn
关键词	Filling And Solidification Gamma-tial Exhaust Valves Suction Casting Simulation Gamma-titanium Aluminides Interface Heat-transfer Thermophysical Properties Numerical-simulation Alloys System
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71600
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	C. Xiong,Y. C. Ma,B. Chen,et al. Modeling of Filling and Solidification Process for TiAl Exhaust Valves During Suction Casting[J]. Acta Metallurgica Sinica-English Letters,2013,26(1):33-48.
APA	C. Xiong,Y. C. Ma,B. Chen,K. Liu,&Y. Y. Li.(2013).Modeling of Filling and Solidification Process for TiAl Exhaust Valves During Suction Casting.Acta Metallurgica Sinica-English Letters,26(1),33-48.
MLA	C. Xiong,et al."Modeling of Filling and Solidification Process for TiAl Exhaust Valves During Suction Casting".Acta Metallurgica Sinica-English Letters 26.1(2013):33-48.