Development of a fast converging material specific void closure model during ingot forging

Harris, Nathan; Shahriari, D.; Jahazi, Mohammad

doi:10.1016/j.jmapro.2017.02.021

Cited by 15 publications

(9 citation statements)

References 10 publications

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“…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%

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: Introductionmentioning

confidence: 97%

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

et al. 2023

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“…We conducted a literature analysis [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ] to explore methods of closing internal metallurgical discontinuities in the process of the hot forging of steel ingots. We previously conducted the numerical modeling of the welding of metallurgical discontinuities during the rod-rolling process in Mg alloy blanks using the FORGE program, and physical verification results were presented in [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Influence of Hot Forging Parameters on the Closing Conditions of Internal Metallurgical Defects in Zirconium Alloy Ingots

et al. 2023

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In this article, we present research results on the closing conditions of internal metallurgical discontinuities during the hot elongation operation of a Zr-1%Nb alloy ingot using physical and numerical modeling. Research on the influence of thermal and deformation parameters of elongation operations on the rheological behavior of a Zr-1% Nb alloy was conducted using the Gleeble 3800 metallurgical process simulator. Modeling of the influence of thermal–mechanical parameters of hot elongation operations in combinations of rhombic and flat anvils on the closure of metallurgical discontinuities was performed with the help of the FORGE®NxT 2.1 program. Based on the results of the research, recommendations were made regarding forging elongation technology and the geometry of working tools in order to ensure the closure of metallurgical discontinuities during hot elongation operations of Zr-1% Nb alloy ingots.

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“…where V is the volumetric strain rate of the void, V is the void volume, Ė is the macroscopic equivalent strain rate, and q 1 and q 2 are the model constants. Similarly to the empirical model, numerous models were developed based on the Gurson-Tvergaard model [2,23].…”

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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Development of a fast converging material specific void closure model during ingot forging

Cited by 15 publications

References 10 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

Investigation of the Influence of Hot Forging Parameters on the Closing Conditions of Internal Metallurgical Defects in Zirconium Alloy Ingots

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

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