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http://dx.doi.org/10.5228/KSPP.2009.18.4.354

Hot Forging Design of Titanium Compressor Wheel for a Marine Turbocharger  

Yeom, J.T. (한국기계연구원 부설 재료연구소)
Na, Y.S. (한국기계연구원 부설 재료연구소)
Lim, J.S. (한국기계연구원 부설 재료연구소)
Kim, J.H. (한국기계연구원 부설 재료연구소)
Hong, J.K. (한국기계연구원 부설 재료연구소)
Park, N.K. (한국기계연구원 부설 재료연구소)
Publication Information
Transactions of Materials Processing / v.18, no.4, 2009 , pp. 354-360 More about this Journal
Abstract
Hot-forging process and die design were made for a large-scale compressor wheel of Ti-6Al-4V alloy by using the results of 2-D FEM simulation. The design integrated the geometry-controlled approach and the processing contour map based on the dynamic materials model and the flow stability criteria. In order to obtain the processing contour map of Ti-6Al-4V alloy, compression tests were carried out in the temperature range of $915^{\circ}C$ to $1015^{\circ}C$ and the strain rate range of $10^{-3}s^{-1}$ to $10s^{-1}$. In the die design of the compressor wheel using the rigid-plastic FEM simulation, forging dimensional accuracy, the capacity of the forging machine and defect-free forging were considered as main design factors. The microstructure of hot forged wheel using the designed die showed a typical alpha-beta structure without forging-defects.
Keywords
A Large-Scale Compression Wheel; Ti-6Al-4V; Hot Forging; Dynamic Materials Model(DMM); Forging-Defects; FEM Simulation;
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