A phase field investigation of dendrite morphology and solute distributions under transient conditions in an Al–Cu welding molten pool

Wang, L.; Wei, Yanhong; Zhan, Xiaohong; Yu, Fengyi

doi:10.1080/13621718.2015.1124504

Cited by 15 publications

(6 citation statements)

References 22 publications

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“…In the past decades, phase-field modeling has been widely used for the simulation of microstructure evolution in the solidification process [13] and for high-speed processes as RP-welding [14,15]. The progress of the phase evolution is dependent to minimizing the free energy functional.…”

Section: Introductionmentioning

confidence: 99%

Transient Softening at the Fusion Boundary of Resistance Spot Welds: A Phase Field Simulation and Experimental Investigations for Al–Si-coated 22MnB5

Sherepenko

Kazemi

Rosemann

et al. 2019

Metals

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This work gives an insight into the transient softening at the fusion boundary of resistance spot welds on hot stamped steel. Metallographic investigations and hardness mapping were combined with finite phase–field modeling of phase evolution at the fusion boundary. Saturation of weld nugget growth in the welding process was observed. For industrially relevant, long welding times, the fusion boundary of a spot weld is therefore isothermally soaked between the peritectic and solidus temperatures. This leads to a carbon segregation to the liquid phase due to higher carbon solubility and possibly to δ-Fe formation at the fusion boundary. Both results in a local carbon depletion at the fusion boundary. This finding is in good agreement with carbon content measurements at the fusion boundary and the results of hardness measurements.

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Section: Introductionmentioning

confidence: 99%

Transient Softening at the Fusion Boundary of Resistance Spot Welds: A Phase Field Simulation and Experimental Investigations for Al–Si-coated 22MnB5

Sherepenko

Kazemi

Rosemann

et al. 2019

Metals

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“…Wang et al studied the microstructure evolution during solidification of welding molten pool. They found that the columnar dendrite growth during welding can be divided into four stages: linear growth stage, nonlinear growth stage, competitive growth stage and relatively steady growth stage [22]. In our early stage works, the variation of maximum undercooling ahead of planar S/L interface with time at linear growth stage is shown in Figure 3.…”

Section: Computational Detailsmentioning

confidence: 73%

“…The radius of heterogeneous nuclei was 2 ∆x. [22]. In our early stage works, the variation of maximum undercooling ahead of planar S/L interface with time at linear growth stage is shown in Figure 3.…”

Section: Computational Detailsmentioning

confidence: 95%

The Interaction between Grains during Columnar-to-Equiaxed Transition in Laser Welding: A Phase-Field Study

Xiong

Wang

et al. 2020

Metals

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A phase-field model was applied to study CET (columnar-to-equiaxed transition) during laser welding of an Al-Cu model alloy. A parametric study was performed to investigate the effects of nucleation undercooling for the equiaxed grains, nucleation density and location of the first nucleation seed ahead of the columnar front on the microstructure of the fusion zone. The numerical results indicated that nucleation undercooling significantly influenced the occurrence and the time of CET. Nucleation density affected the occurrence of CET and the size of equiaxed grains. The dendrite growth behavior was analyzed to reveal the mechanism of the CET. The interactions between different grains were studied. Once the seeds ahead of the columnar dendrites nucleated and grew, the columnar dendrite tip velocity began to fluctuate around a value. It did not decrease until the columnar dendrite got rather close to the equiaxed grains. The undercooling and solute segregation profile evolutions of the columnar dendrite tip with the CET and without the CET had no significant difference before the CET occurred. Mechanical blocking was the major blocking mechanism for the CET. The equiaxed grains formed first were larger than the equiaxed grains formed later due to the decreasing of undercooling. The size of equiaxed grain decreased from fusion line to center line. The numerical results were basically consistent with the experimental results obtained by laser welding of a 2A12 Al-alloy.

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“…The increase trend is more obvious with the decrease of the welding velocity. In the study conducted by Wang et al, 30 the evolution of the dendrite in the welding molten pool is divided into the linear growth period, the nonlinear growth period, the competitive growth period and the short-term steady growth period. In this work, the primary dendrite arm spacing at the short-term steady growth period is investigated and discussed.…”

Section: Primary Dendrite Arm Spacing Under Different Welding Velocitiesmentioning

confidence: 99%

Simulation of primary dendrite arm spacing in an Al–Cu welding molten pool

Wang

Wei

2017

Materials Science and Technology

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Primary dendrite arm spacing in tungsten inert gas welding pool for Al–4wt%Cu alloys is predicted by a quantitative phase-field model. Transient conditions are obtained by functions of thermal gradient and solidification rate. When the same welding power is given by 3500 W and different welding velocities are given by 1.5, 2.0 and 2.5 mm s−1, the primary dendrite arm spacing obtained by simulation results is the largest under the welding velocity of 2.0 mm s−1. When the same welding velocity is given by 2.5 mm s−1 and different welding power is given by 3500, 4000 and 5000 W, the primary dendrite arm spacing acquired by simulation results is the largest under the welding power of 5000 W. Primary dendrite arm spacing and morphology obtained by simulation results agrees well with experimental findings.

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A phase field investigation of dendrite morphology and solute distributions under transient conditions in an Al–Cu welding molten pool

Cited by 15 publications

References 22 publications

Transient Softening at the Fusion Boundary of Resistance Spot Welds: A Phase Field Simulation and Experimental Investigations for Al–Si-coated 22MnB5

Transient Softening at the Fusion Boundary of Resistance Spot Welds: A Phase Field Simulation and Experimental Investigations for Al–Si-coated 22MnB5

The Interaction between Grains during Columnar-to-Equiaxed Transition in Laser Welding: A Phase-Field Study

Simulation of primary dendrite arm spacing in an Al–Cu welding molten pool

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