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Effect of Surface Tension Anisotropy and Welding Parameters on Initial Instability Dynamics During Solidification: A Phase-Field Study

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Abstract

The effects of surface tension anisotropy and welding parameters on initial instability dynamics during gas tungsten arc welding of an Al-alloy are investigated by a quantitative phase-field model. The results show that the surface tension anisotropy and welding parameters affect the initial instability dynamics in different ways during welding. The surface tension anisotropy does not influence the solute diffusion process but does affect the stability of the solid/liquid interface during solidification. The welding parameters affect the initial instability dynamics by varying the growth rate and thermal gradient. The incubation time decreases, and the initial wavelength remains stable as the welding speed increases. When welding power increases, the incubation time increases and the initial wavelength slightly increases. Experiments were performed for the same set of welding parameters used in modeling, and the results of the experiments and simulations were in good agreement.

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Acknowledgments

The study is supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) and the financial aid for the project from the Fundamental Research Funds for the Central Universities NP2016204. The authors acknowledge Long-Qing Chen and Xiaoxing Cheng at Pennsylvania State University for their help in the development of the phase-field code.

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Authors and Affiliations

  1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Fengyi Yu & Yanhong Wei

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  1. Fengyi Yu
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  2. Yanhong Wei
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Correspondence to Yanhong Wei.

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Manuscript submitted November 27, 2017.

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Yu, F., Wei, Y. Effect of Surface Tension Anisotropy and Welding Parameters on Initial Instability Dynamics During Solidification: A Phase-Field Study. Metall Mater Trans A 49, 3293–3305 (2018). https://doi.org/10.1007/s11661-018-4663-7

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  • DOI: https://doi.org/10.1007/s11661-018-4663-7

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