Phase-field simulation of solidification morphology in laser powder deposition of Ti–Nb alloys

Fallah, Vahid; Amoorezaei, Morteza; Provatas, Nikolas; Corbin, Stephen F.; Khajepour, Amir

doi:10.1016/j.actamat.2011.12.009

Cited by 165 publications

(69 citation statements)

References 32 publications

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“…These results suggest that an indirect coupling between thermal modeling of a cast ingot and local modeling of microstructure selection is a valid approach for spacing selection (see examples of such couplings with phase-field in Refs. 48,49). However, this type of coupling does not account for the history-dependent selection of spacing.…”

Section: Resultsmentioning

confidence: 99%

Three-Dimensional Multiscale Modeling of Dendritic Spacing Selection During Al-Si Directional Solidification

Tourret

Clarke

Imhoff

et al. 2015

JOM

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We present a three-dimensional extension of the multiscale dendritic needle network (DNN) model. This approach enables quantitative simulations of the unsteady dynamics of complex hierarchical networks in spatially extended dendritic arrays. We apply the model to directional solidification of Al-9.8 wt.%Si alloy and directly compare the model predictions with measurements from experiments with in situ x-ray imaging. We focus on the dynamical selection of primary spacings over a range of growth velocities, and the influence of sample geometry on the selection of spacings. Simulation results show good agreement with experiments. The computationally efficient DNN model opens new avenues for investigating the dynamics of large dendritic arrays at scales relevant to solidification experiments and processes.

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Section: Resultsmentioning

confidence: 99%

Three-Dimensional Multiscale Modeling of Dendritic Spacing Selection During Al-Si Directional Solidification

Tourret

Clarke

Imhoff

et al. 2015

JOM

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“…Fallah et al [5] used the thermal analysis model in the process of direct laser deposited Ti-Nb alloy as follows:…”

Section: Pf Simulation Methods Of Solidification Microstructure Of Allmentioning

confidence: 99%

The Study on Simulation Theory of Solidification Microstructure of Alloy Melt Pool in the Laser Additive Manufacturing Process

Zhou¹,

Chen²,

Guan³

et al. 2017

2017 International Conference on Materials Science and Biological Engineering (ICMSBE 2017)

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Keywords:Laser additive manufacturing; alloy steel; microstructure of melt pool; phase field method; cellular automaton method. Abstract:With the development of laser additive manufacturing technology (LAM) and computer technology, it has been widely concerned that the simulation method is used to predict the solidification microstructure of alloy melt pool in the LAM process, because simulation method has advantages of short experimental period, low cost and comprehensiveness. This paper respectively introduces the basic principle of phase field (PF) model and cellular automaton (CA) model, and then illustrates the application of simulating the solidification microstructure of alloy melt pool in the process of LAM. In addition, the results of comparative analysis shows that CA method is more suitable for simulating the microstructure of melt pool than PF method in the LAM process. Finally, the existing problems and future development trends of models and algorithms are put forward, which provides a theoretical reference for the laser additive manufacturing of alloy steel.

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“…where j at is expressed as (6) As can be seen in equation (6), the anti-trapping current is proportional to the interface width w, the growth velocity V n = ∂φ/∂t, and is related to the equilibrium partition coefficient k e . To include the solid diffusivity in the model, the expressions of q ∼ (φ) a(φ) proposed by Ohno and Matsuura [21] are adopted, i.e.…”

Section: A Multi-scale Approach To Simulate Solidification Structure mentioning

confidence: 99%

“…Thus, the solidified microstructure, characterized by arrays of columnar cells/dendrites where microsegregation occurs, vary spatially in a range of length scales [2]. The microstructure and microsegregation have a significant impact on the mechanical properties of the welded products and subsequent heat treatment processes [6][7][8]. For instance, as observed in the dendritic array by Dong et al [9][10][11], the solute is richer in the liquid between the neighbouring primary arms and thus the undesirable columnar to equiaxed transition is more likely to happen in these places.…”

Section: Introductionmentioning

confidence: 99%

A Multi-Scale Approach to Simulate Solidification Structure Evolution and Solute Segregation in a Weld Pool

Xie

Dong

et al. 2013

Journal of Algorithms & Computational Technology

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During welding, work-pieces are melted to form a weld pool and are joined upon solidification. The quality of the welded product is largely determined by the solidified microstructure and solute distribution. In recent years phasefield (PF) models have been developed to simulate solidification structure evolution and microsegregation. However many input data for the PF simulations are difficult to measure, including at the nanoscale the solid-liquid interfacial energy and its anisotropy, and at the macroscale the solidification conditions. In this study, an integrated scheme is proposed to resolve the above challenges by linking nanoscale molecular dynamics modelling (MD) and mesoscale front tracking (FT) modelling to the PF modelling. The approach is demonstrated in a case study in which the solidified structures and solute distributions are simulated in the weld pool for Fe-0.3wt. %C steel.

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Phase-field simulation of solidification morphology in laser powder deposition of Ti–Nb alloys

Cited by 165 publications

References 32 publications

Three-Dimensional Multiscale Modeling of Dendritic Spacing Selection During Al-Si Directional Solidification

Three-Dimensional Multiscale Modeling of Dendritic Spacing Selection During Al-Si Directional Solidification

The Study on Simulation Theory of Solidification Microstructure of Alloy Melt Pool in the Laser Additive Manufacturing Process

A Multi-Scale Approach to Simulate Solidification Structure Evolution and Solute Segregation in a Weld Pool

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