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

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Abstract

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.

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Acknowledgments

The authors gratefully acknowledge a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) and the financial support of the project from the Fundamental Research Funds for the Central Universities NP2016204.

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Authors and Affiliations

  1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, P.R. China

    Lili Chen, Yanhong Wei, Shufan Qiu & Wenyong Zhao

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  1. Lili Chen
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  2. Yanhong Wei
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  3. Shufan Qiu
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Correspondence to Yanhong Wei.

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Manuscript submitted July 10, 2019.

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Chen, L., Wei, Y., Qiu, S. et al. Macro–Micro Scale Modeling and Simulation of Columnar Grain Evolution During Gas Tungsten Arc Welding of Nickel-Based Alloy GH3039. Metall Mater Trans A 51, 887–896 (2020). https://doi.org/10.1007/s11661-019-05546-w

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