<P><B>Abstract</B></P><P>A three-dimensional cellular automaton (CA) model has been coupled with finite-element (FE) heat flow calculation to predict the solidification grain structures in a Ni-base superalloy. In the pre...
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https://www.riss.kr/link?id=A107561349
2007
-
SCOPUS,SCIE
학술저널
713-716(4쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P><B>Abstract</B></P><P>A three-dimensional cellular automaton (CA) model has been coupled with finite-element (FE) heat flow calculation to predict the solidification grain structures in a Ni-base superalloy. In the pre...
<P><B>Abstract</B></P><P>A three-dimensional cellular automaton (CA) model has been coupled with finite-element (FE) heat flow calculation to predict the solidification grain structures in a Ni-base superalloy. In the present CA–FE model, Gaussian distribution of nucleation sites was adopted and the Kurz–Giovanola–Trivedi model was extended to multi-component alloys to account for the growth kinetics of the dendrite tip. In particular, for describing the Gaussian distribution of nucleation sites at the mold surface, an empirical relationship between the nucleation density at the surface and the initial cooling time of the melt was proposed and applied to the input parameter in the model. The predicted grain structures were validated at various casting conditions by comparison with the experimental micrographs obtained with cylindrical shaped castings. The CA–FE model was also applied to the complex shaped turbine blade casting and the computed grain structure of turbine blade airfoil was compared with the experimental micrograph.</P>
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