EBSD characterization and modeling of columnar dendritic grains growing in the presence of fluid flow[Electron Backscattered Diffraction]
Columnar dendritic grains of steel growth in the presence of fluid flow (e.g., solidified on turning rolls) have been characterized by Electron Backscattered Diffraction (EBSD) technique. It is shown that grains have a random crystallographic orientation at the surfaces of the sheet in contact with the mould. In the middle of the sheet, the grains which have survived the growth selection mechanisms exhibit a (100) texture in which the average dendrite trunk direction is not exactly aligned with the thermal gradient (i.e., the normal to the surfaces of the sheet). It is tilted by about 15{degree} toward the upstream direction. This deviation is examined by simulations of grain structure formation based on a three-dimensional Cellular Automation (CA)-Finite Element (FE) (3D CAFE) model, which has been modified in order to account for fluid flow effects. The modified Ca algorithm includes a growth kinetics of the dendrites which is a function of both the undercooling and fluid flow direction. It is validated by comparing the predicted shape of an individual grain growing under given thermal and fluid flow conditions with an analytical solution. The 3D CAFE predictions of the columnar grains grown in the presence of fluid flow are in good agreement with the experimental EBSB results.
- Research Organization:
- Lab. de Metallurgie Physique, Lausanne (CH)
- OSTI ID:
- 20015222
- Journal Information:
- Acta Materialia, Vol. 48, Issue 3; Other Information: PBD: 9 Feb 2000; ISSN 1359-6454
- Country of Publication:
- United States
- Language:
- English
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