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

doi:10.3724/SP.J.1037.2011.00354

IMR OpenIR

	WATER MODELING OF MOULD FILLING DURING SUCTION CASTING PROCESS OF AUTOMOTIVE EXHAUST VALVES OF gamma-TiAl BASED ALLOYS
	Xiong Chao; Ma Yingche; Chen Bo; Liu Kui; Li Yiyi
通讯作者	Ma Yingche(ycma@imr.ac.cn)
	2011-11-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	47 期号:11 页码:1408-1417
摘要	Investment and suction casting represents a more cost effective route to produce automotive exhaust valves of gamma-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 gamma-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 m(3)/h or the air leakage flow is smaller than 1.5 m(3)/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.
关键词	gamma titanium aluminides automotive exhaust valves suction casting water modeling
DOI	10.3724/SP.J.1037.2011.00354
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000299492300009
出版者	SCIENCE PRESS
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/105711
专题	中国科学院金属研究所
通讯作者	Ma Yingche
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Xiong Chao,Ma Yingche,Chen Bo,et al. WATER MODELING OF MOULD FILLING DURING SUCTION CASTING PROCESS OF AUTOMOTIVE EXHAUST VALVES OF gamma-TiAl BASED ALLOYS[J]. ACTA METALLURGICA SINICA,2011,47(11):1408-1417.
APA	Xiong Chao,Ma Yingche,Chen Bo,Liu Kui,&Li Yiyi.(2011).WATER MODELING OF MOULD FILLING DURING SUCTION CASTING PROCESS OF AUTOMOTIVE EXHAUST VALVES OF gamma-TiAl BASED ALLOYS.ACTA METALLURGICA SINICA,47(11),1408-1417.
MLA	Xiong Chao,et al."WATER MODELING OF MOULD FILLING DURING SUCTION CASTING PROCESS OF AUTOMOTIVE EXHAUST VALVES OF gamma-TiAl BASED ALLOYS".ACTA METALLURGICA SINICA 47.11(2011):1408-1417.