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Contact |
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Carreño-Morelli Efraín |
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Title |
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Investment casting of nozzle guide vanes from nickel-based superalloys: part II - grain structure prediction |
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Author(s) |
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Torroba A. J., Koeser O., Calba L., Maestro L., Carreño-Morelli E., Rahimian M., Milenkovic S., Sabirov I., Llorca J. |
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References |
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Integrating Materials and Manufacturing Innovation 2014, 3:26, pp. 1-16 |
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Url |
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http://link.springer.com/article/10.1186%2Fs40192-014-0026-4# |
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Abstract |
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The control of grain structure, which develops during solidification processes in
investment casting of nozzle guide vanes (NGVs), is a key issue for optimization of their
mechanical properties. The main objective of this part of the work was to develop a
simulation tool for predicting grain structure in the new generation NGVs made from
MAR-M247 Ni-based superalloy. A cellular automata - finite element (CAFE) module is
employed to predict the three-dimensional (3D) grain structure in the as-cast NGV. The
grain structure in the critical sections of the experimentally cast NGV is carefully
analyzed, the experimental results are compared with the modeling outcomes, and the
model is calibrated via tuning parameters which govern grain nucleation and growth.
The grain structures predicted by the calibrated model show a very good accordance
with the real ones observed in the critical sections of the as-cast NGV. It is demonstrated
that the calibrated CAFE model is a reliable tool for the foundry industry to predict grain
structure of the as-cast NGVs with very high accuracy. |
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