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Stochastic modeling of columnar dendritic grain growth in weld pool of Al‐Cu alloy
Author(s) -
Zhan X. H.,
Dong Z. B.,
Wei Y. H.,
Tian N.
Publication year - 2009
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200800206
Subject(s) - dendrite (mathematics) , supercooling , temperature gradient , materials science , alloy , diffusion , welding , weld pool , tungsten , metallurgy , inert gas , gas tungsten arc welding , composite material , thermodynamics , geometry , arc welding , physics , mathematics , quantum mechanics
A multi‐scale model is used to simulate columnar dendritic growth in TIG (tungsten inert‐gas) weld molten pool of Al‐Cu alloy. The grain morphologies at the edge of the weld pool are studied. The simulated results indicate that the average primary dendrite spacing changes during the solidification process in the weld pool because of the complicated thermal field, solute diffusion field and competitive growth. And it is shown that the secondary dendrite arms grow insufficiently in the space between dendrite trunks if the primary dendrite spacing is small. And the phenomenon has been explained by analyzing the influence of the solute accumulation on the constitutional undercooling and undercooling gradient when there are two different opposite solute diffusion fields. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)