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所属单位：材料科学与技术学院

发表刊物：METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE

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

摘要：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号：1073-5623

是否译文：否

发表时间：2018-08-01

合写作者：Yu, Fengyi

通讯作者：Yu, Fengyi,魏艳红