Macro–Micro Scale Modeling and Simulation of Columnar Grain Evolution During Gas Tungsten Arc Welding of Nickel-Based Alloy GH3039

A cellular automata model combined with the finite element method was developed to simulate the solidification microstructure of nickel-based alloy GH3039 molten pool gotten with gas tungsten arc welding. The macro temperature field simulated with the finite element model was projected into the cell...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2020-02, Vol.51 (2), p.887-896
Main Authors: Chen, Lili, Wei, Yanhong, Qiu, Shufan, Zhao, Wenyong
Format: Article
Language:English
Subjects:
Base metal
Cellular automata
Characterization and Evaluation of Materials
Chemistry and Materials Science
Computer simulation
Electron backscatter diffraction
Epitaxial growth
Evolution
Finite element method
Gas tungsten arc welding
Grain size distribution
Grain structure
Materials Science
Mathematical models
Metallic Materials
Model accuracy
Nanotechnology
Nickel alloys
Nickel base alloys
Nucleation
Optical microscopy
Solidification
Structural Materials
Surfaces and Interfaces
Temperature distribution
Temperature gradients
Thin Films
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Summary:A cellular automata model combined with the finite element method was developed to simulate the solidification microstructure of nickel-based alloy GH3039 molten pool gotten with gas tungsten arc welding. The macro temperature field simulated with the finite element model was projected into the cellular automata mesh. Based on the meshes, the epitaxial nucleation and competitive growth in the molten pool were carried out. The effects of base metal grain structure and welding conditions on the solidification evolution were investigated. The results show that the width of columnar grain increases as the initial grain size grows. The shape and the thermal distribution of the molten pool vary with the welding conditions. The competitive growth is dominant by the temperature gradient direction, and the grain structures in the weld eventually tended to be perpendicular to the fusion line. The geometry and the microstructures of experimental joints were fully characterized using optical microscopy and electron backscattered diffraction. The simulation results agree well with the corresponding experimental results, validating the accuracy of the current model.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-019-05546-w