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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
Corresponding AuthorMa Yingche(ycma@imr.ac.cn)
2011-11-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume47Issue:11Pages:1408-1417
AbstractInvestment 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.
Keywordgamma titanium aluminides automotive exhaust valves suction casting water modeling
DOI10.3724/SP.J.1037.2011.00354
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000299492300009
PublisherSCIENCE PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/105711
Collection中国科学院金属研究所
Corresponding AuthorMa Yingche
AffiliationChinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
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.
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