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Affiliation of Author(s):材料科学与技术学院

Journal:METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE

Key Words:AL-CU ALLOY DIRECTIONAL-SOLIDIFICATION ALUMINUM-ALLOY MICROSTRUCTURE EVOLUTION TRANSIENT CONDITIONS DENDRITE GROWTH 3 DIMENSIONS MOLTEN POOL SIMULATION INTERFACE

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.

ISSN No.:1073-5623

Translation or Not:no

Date of Publication:2018-08-01

Co-author:Yu, Fengyi

Correspondence Author:Yu, Fengyi,Wei Yanhong