A void closure model based on hydrostatic integration and the Lode parameter for additive manufacturing AlSi10Mg

Niu, Liqun; Zhang, Qi

doi:10.1016/j.jmapro.2021.10.056

Cited by 8 publications

(7 citation statements)

References 21 publications

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“…At the temperature T = 862 • C, a polymorphic transformation takes place in zircon, and the crystal lattice changes from the hexagonal A3 lattice to the spatially centered cubic lattice A2 [2]. The non-monotonicity of the curve may be caused by the beginning of the polymorphic transformation [11]. This difference may be due to the dynamic softening process being delayed with the increase in strain rate.…”

Section: Testing Resultsmentioning

confidence: 99%

“…At the temperature T = 862 °C, a polymorphic transformation takes place in zircon, and the crystal la ice changes from the hexagonal A3 la ice to the spatially centered cubic la ice A2 [2]. The non-monotonicity of the curve may be caused by the beginning of the polymorphic transformation [11]. As an effect of approximation of the investigational zirconium alloy curves, Hensel-Spittel coefficients were determined for the temperature and speed of the following plastic processing conditions: T = 770-950 • C, and .…”

Section: Testing Resultsmentioning

confidence: 99%

“…An analysis of the literature shows that methods for closing foundry voids during hot elongation of steel bars and aluminum and magnesium alloys are known [8][9][10][11][12][13][14][15], while no workswere found on closing foundry voids in the elongation operation of zirconium bars with the exception of the authors' work [16].…”

Section: Introductionmentioning

confidence: 97%

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Modeling of Closure of Metallurgical Discontinuities in the Process of Forging Zirconium Alloy

et al. 2023

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This article presents the results of testing the conditions of closing foundry voids during the hot forging operation of an ingot made of zirconium with 1% Nb alloy and use of physical and numerical modeling, continuing research presented in a previous thematically related article published in the journal Materials. The study of the impact of forging operation parameters on the rheology of zirconium with 1% Nb alloy was carried out on a Gleeble 3800 device. Using the commercial FORGE®NxT 2.1 program, a numerical analysis was performed of the influence of thermo-mechanical parameters of the hot elongation operation in trapezoidal flat and rhombic trapezoidal anvils on the closure of foundry voids. The analysis of the obtained test results was used to formulate recommendations on the technology of hot forging and the anvilgeometry, ensuring closure of foundry voids. Based on their research, the authors conclude that the shape of the deformation basin and the value and hydrostatic pressure have the greatest influences on the closure of foundry voids.

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Section: Testing Resultsmentioning

confidence: 99%

Section: Testing Resultsmentioning

confidence: 99%

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Modeling of Closure of Metallurgical Discontinuities in the Process of Forging Zirconium Alloy

et al. 2023

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“…Early void closure models often considered stress triaxiality only. However, recent studies have revealed that the Lode angle is also a significant parameter influencing void deformation behaviour [2,16,17,19]. In this study, the model coefficients in Equation ( 16) were expressed as polynomial functions of the triaxiality, Lode angle, shape parameters, and direction cosine as follows:…”

Section: Void Closure Modelmentioning

confidence: 99%

“…The geometry and orientation parameters could be calibrated from RVE simulations with different initial void shapes and orientations. Based on the STB model, numerous forms of void volume evolution functions were proposed [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A Geometry-Dependent Void Closure Model Considering Void Deformation and Orientation Changes during Hot Metal Formation

Kim

Park

Kim

et al. 2023

JMMP

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In this paper, a void closure model applicable to the general hot forming process has been proposed. Through the representative volume element (RVE) method, the influences of void shape, orientation, and stress state on void closure tendency were analysed. The void closure model was established so that it could consider these cross effects. The model calculates the changing void radius and orientation during deformation by considering the rate of change of the parameters affecting void deformation with respect to the effective strain. The model predicted the void closure tendency well on the RVE scale and predicted the void closure adequately in a multi-stage process with random voids. The results were compared with the stress-triaxiality-based (STB) model, which showed that the void closure model proposed in this study is applicable in general situations. A cogging process was analysed, and the degree of void closure at the end of each pass was compared with the calculated results of the void closure model. For the experimental verification of the proposed model, spherical and ellipsoid voids were placed in a rectangular specimen, and the radii of the voids after compression were measured. The measurement results were compared with the calculation results of the proposed model.

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Simulation and experiment research on integrated casting and forging process of automobile control arm

et al. 2022

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A void closure model based on hydrostatic integration and the Lode parameter for additive manufacturing AlSi10Mg

Cited by 8 publications

References 21 publications

Modeling of Closure of Metallurgical Discontinuities in the Process of Forging Zirconium Alloy

Modeling of Closure of Metallurgical Discontinuities in the Process of Forging Zirconium Alloy

A Geometry-Dependent Void Closure Model Considering Void Deformation and Orientation Changes during Hot Metal Formation

Simulation and experiment research on integrated casting and forging process of automobile control arm

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