Numerical Simulation and Process Optimization of Investment Casting of the Blades for High Nb Containing TiAl Alloy

Liang Yang; Li Hua Chai; Lai Qi Zhang; Jun Pin Lin

doi:10.4028/www.scientific.net/MSF.747-748.105

Paper Titles

Laser Remelting Effect on the Joint Property of Diffusion Bonding of TiAl Intermetallics and TC4 Alloy
p.77

The Influence of Niobium on the Interdiffusion Coefficients in α₂and γ of TiAl Alloys
p.85

Effects of Scandium on Corrosion Resistance and Mechanical Properties of Cellular Al-Based Foams
p.93

Preparation of TiAl Intermetallic Alloy by Gelcasting
p.101

Numerical Simulation and Process Optimization of Investment Casting of the Blades for High Nb Containing TiAl Alloy
p.105

The Microstructure and Compression Behavior of Multi-Step Forging Ti-45Al-8Nb Alloy after Annealing at 1100 °C
p.111

Influence of Exposure at 750°C on Room Temperature Tensile Ductility of Cast TiAl Alloy with the Directional Lamellar Microstructure
p.115

Investigation on B, Cr Doped Ni₃Al Alloy Prepared by Self-Propagation High-Temperature Synthesis and Hot Extrusion
p.124

Room Temperature Brittlement of T2 in the Mo-Si-B System
p.132

HomeMaterials Science ForumMaterials Science Forum Vols. 747-748Numerical Simulation and Process Optimization of...

Numerical Simulation and Process Optimization of Investment Casting of the Blades for High Nb Containing TiAl Alloy

Abstract:

Low pressure turbine blades (LPT) made by investment casting from intermetallic titanium aluminide alloys for aero-engine applications have about 50% weight saving compared with that from nickel-based counterparts. Investment casting process of the low pressure turbine blades for high Nb containing TiAl alloy was simulated by Procast. The height of the blade is about 125mm and the thinnest part of it is about 6mm. Compositions of the cast and mould are Ti-45.5Al-8Nb (at %) and Zircon sand, respectively. The simulation result showed that there were porosities appearing in the centre of blades, which may be due to the formation of isolated liquid. In this work, the simulation, analysis and comparison of different casting ways were carried out. The result showed that compared with top and bottom casting, blades made by side casting have less porosity defects. And then the casting temperature, casting velocity, mould preheating temperature and interface heat transfer coefficient were optimized based on orthogonal design. The result also indicated that the influence of process parameters to porosity defects of blades can be ranked from strong to weak as follow: casting temperature>shell mould preheating temperature>casting velocity>interface heat transfer coefficient. When the casting temperature was 1700, the mould preheating temperature was 500, the casting velocity was 0.5 m·s^-1, and the interface heat transfer coefficient was 500 W·m^-2·K^-1, the volume of porosity defects was the smallest.

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Periodical:

Materials Science Forum (Volumes 747-748)

Pages:

105-110

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.747-748.105

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Online since:

February 2013

Authors:

Liang Yang, Li Hua Chai, Lai Qi Zhang, Jun Pin Lin

Keywords:

High Nb Containing TiAl Alloy, Investment Casting, Orthogonal Design, ProCAST Simulation, Process Optimization

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