Numerical study of crucial parameters in tilt casting for titanium aluminides  

作　　者：Hong Wang G. Djambazov K. A. Pericleous 

机构地区：[1]School of Petroleum Engineering, University of Changzhou, Changzhou 213164, China [2]Centre for Numerical Modeling and Process Analysis, Universi~ of Greenwich, London, SEIO 9LS, UK

出　　处：《China Foundry》2011年第3期274-281,共8页中国铸造（英文版）

基　　金：financially supported by EU:IP project IMPRESS(Intermetallic Materials Processing in Relation to Earth and Space Solidif ication,No.NMP3-CT-2004-500635)

摘　　要：Numerical modeling of the tilt casting process for TiAI alloys was investigated to achieve a tranquil mould filling and TiAI castings free of defects. Titanium alloys are very reactive in molten state, so they are widely melted in cold crucible, e.g. the Induction Skull Melting （ISM） furnace. Then the crucible holding the molten metal together with the mould is rotated to transfer the metal into the mould -- ISM＋ tilt casting. This paper emphasizes the effect of crucial parameters on mould filling and solidification of the castings during tilt casting. All crucial parameters, such as rotation rate, rotation profile, venting, initial mould temperature, casting orientation, feeder design, change of radius in ＇T＇ junction and mould insulation have been discussed using numerical modeling data. Simulations were performed using a 3D CFD code PHYSICA implemented with front tracking, heat transfer algorithms and a turbulence model （which accounts for an advancing solid front）.Numerical modeling of the tilt casting process for TiAl alloys was investigated to achieve a tranquil mould filling and TiAl castings free of defects. Titanium alloys are very reactive in molten state, so they are widely melted in cold crucible, e.g. the Induction Skull Melting (ISM) furnace. Then the crucible holding the molten metal together with the mould is rotated to transfer the metal into the mould--ISM+ tilt casting. This paper emphasizes the effect of crucial parameters on mould filling and solidification of the castings during tilt casting. All crucial parameters, such as rotation rate, rotation profile, venting, initial mould temperature, casting orientation, feeder design, change of radius in'T'junction and mould insulation have been discussed using numerical modeling data. Simulations were performed using a 3D CFD code PHYSICA implemented with front tracking, heat transfer algorithms and a turbulence model (which accounts for an advancing solid front).

关 键 词：crucial parameters numerical modeling tilt casting TiAI alloy 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TP391.9[金属学及工艺—金属材料]