Effect of the misorientation angle and anisotropy strength on the initial planar instability dynamics during solidification in a molten pool

Fengyi Yu, Yanzhou Ji, Yanhong Wei, Long-qing Chen

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The initial planar instability will appear with the solute accumulation ahead of the solid/liquid (S/L) interface during solidification in a molten pool. The instability process is dominated by the misorientation angle and the surface tension anisotropy strength, where the misorientation angle is the angle between the preferred crystalline orientation of base metal and the thermal gradient direction in front of the S/L interface. In this study, their effects on the initial planar instability during gas tungsten arc welding of an Al-alloy are investigated using a modified analytic model and a quantitative phase-field model, respectively. Specifically, we apply the uniform fluctuation spectrum assumption, A ω (0) = k B T M /{γ 0 [1 − 15γ 4 cos(4θ 0 )]ω 2 }, to represent the influence of thermal noise on S/L interface evolution. The incubation time, average wavelength and detailed interface morphology of the initial planar instability are investigated with varying surface tension anisotropies (determined by anisotropy strength γ 4 and misorientation angle θ 0 ). The results indicate that -γ 4 cos(4θ 0 ) is a reasonable indicator for the effect of surface tension anisotropy on the initial planar instability. Moreover, rather than influencing solute diffusion, the surface tension anisotropy just affects the planar interface stability during the solidification. Finally, the experimental observations with the same welding parameters was carried out, which are in general agreement with the simulated results.

Original languageEnglish (US)
Pages (from-to)204-214
Number of pages11
JournalInternational Journal of Heat and Mass Transfer
Volume130
DOIs
StatePublished - Mar 1 2019

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misalignment
solidification
Solidification
Molten materials
Anisotropy
interfacial tension
liquid-solid interfaces
anisotropy
Surface tension
solutes
interface stability
gas tungsten arc welding
Liquids
thermal noise
Tungsten
Thermal noise
welding
Electric arc welding
Crystal orientation
Thermal gradients

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

@article{596e106ce6464961a99e77034779d073,
title = "Effect of the misorientation angle and anisotropy strength on the initial planar instability dynamics during solidification in a molten pool",
abstract = "The initial planar instability will appear with the solute accumulation ahead of the solid/liquid (S/L) interface during solidification in a molten pool. The instability process is dominated by the misorientation angle and the surface tension anisotropy strength, where the misorientation angle is the angle between the preferred crystalline orientation of base metal and the thermal gradient direction in front of the S/L interface. In this study, their effects on the initial planar instability during gas tungsten arc welding of an Al-alloy are investigated using a modified analytic model and a quantitative phase-field model, respectively. Specifically, we apply the uniform fluctuation spectrum assumption, A ω (0) = k B T M /{γ 0 [1 − 15γ 4 cos(4θ 0 )]ω 2 }, to represent the influence of thermal noise on S/L interface evolution. The incubation time, average wavelength and detailed interface morphology of the initial planar instability are investigated with varying surface tension anisotropies (determined by anisotropy strength γ 4 and misorientation angle θ 0 ). The results indicate that -γ 4 cos(4θ 0 ) is a reasonable indicator for the effect of surface tension anisotropy on the initial planar instability. Moreover, rather than influencing solute diffusion, the surface tension anisotropy just affects the planar interface stability during the solidification. Finally, the experimental observations with the same welding parameters was carried out, which are in general agreement with the simulated results.",
author = "Fengyi Yu and Yanzhou Ji and Yanhong Wei and Long-qing Chen",
year = "2019",
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language = "English (US)",
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TY - JOUR

T1 - Effect of the misorientation angle and anisotropy strength on the initial planar instability dynamics during solidification in a molten pool

AU - Yu, Fengyi

AU - Ji, Yanzhou

AU - Wei, Yanhong

AU - Chen, Long-qing

PY - 2019/3/1

Y1 - 2019/3/1

N2 - The initial planar instability will appear with the solute accumulation ahead of the solid/liquid (S/L) interface during solidification in a molten pool. The instability process is dominated by the misorientation angle and the surface tension anisotropy strength, where the misorientation angle is the angle between the preferred crystalline orientation of base metal and the thermal gradient direction in front of the S/L interface. In this study, their effects on the initial planar instability during gas tungsten arc welding of an Al-alloy are investigated using a modified analytic model and a quantitative phase-field model, respectively. Specifically, we apply the uniform fluctuation spectrum assumption, A ω (0) = k B T M /{γ 0 [1 − 15γ 4 cos(4θ 0 )]ω 2 }, to represent the influence of thermal noise on S/L interface evolution. The incubation time, average wavelength and detailed interface morphology of the initial planar instability are investigated with varying surface tension anisotropies (determined by anisotropy strength γ 4 and misorientation angle θ 0 ). The results indicate that -γ 4 cos(4θ 0 ) is a reasonable indicator for the effect of surface tension anisotropy on the initial planar instability. Moreover, rather than influencing solute diffusion, the surface tension anisotropy just affects the planar interface stability during the solidification. Finally, the experimental observations with the same welding parameters was carried out, which are in general agreement with the simulated results.

AB - The initial planar instability will appear with the solute accumulation ahead of the solid/liquid (S/L) interface during solidification in a molten pool. The instability process is dominated by the misorientation angle and the surface tension anisotropy strength, where the misorientation angle is the angle between the preferred crystalline orientation of base metal and the thermal gradient direction in front of the S/L interface. In this study, their effects on the initial planar instability during gas tungsten arc welding of an Al-alloy are investigated using a modified analytic model and a quantitative phase-field model, respectively. Specifically, we apply the uniform fluctuation spectrum assumption, A ω (0) = k B T M /{γ 0 [1 − 15γ 4 cos(4θ 0 )]ω 2 }, to represent the influence of thermal noise on S/L interface evolution. The incubation time, average wavelength and detailed interface morphology of the initial planar instability are investigated with varying surface tension anisotropies (determined by anisotropy strength γ 4 and misorientation angle θ 0 ). The results indicate that -γ 4 cos(4θ 0 ) is a reasonable indicator for the effect of surface tension anisotropy on the initial planar instability. Moreover, rather than influencing solute diffusion, the surface tension anisotropy just affects the planar interface stability during the solidification. Finally, the experimental observations with the same welding parameters was carried out, which are in general agreement with the simulated results.

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