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3D Stochastic Modeling of As-Cast Microstructure for Aluminum Alloy Casting

[+] Author Affiliations
Q. Y. Xu, W. M. Feng, B. C. Liu

Tsinghua University, Beijing, China

Paper No. IMECE2002-32894, pp. 243-249; 7 pages
doi:10.1115/IMECE2002-32894
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 5
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3636-3 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

A 3D stochastic modeling was carried out to simulate the dendritic grains during solidification process of aluminum alloy, including time-dependent calculations for temperature field, solute redistribution in liquid, curvature of the dendritic tip, and growth anisotropy. The nucleation process was calculated by continuous nucleation. A 3D simplified grain shape model was established to represent the equiaxed dendritic grain. Based on the Cellular Automaton method, a grain growth model was proposed to capture the neighbor cells of the nucleated cell. On growing, each grain continues to capture the nearest neighbor cells to form the final shape. When a neighboring cell has been captured by the other grains, the grain growth along this direction is stopped. Three-dimensional calculations were performed to simulate the evolution of dendritic grain. In order to verify the modeling results, aluminum alloy sample castings were cast in sand and metal mold.

Copyright © 2002 by ASME

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