Investigation of void closure in open-die forging considering changing load directions

Hibbe, Paul; Wolfgarten, Martin

doi:10.1007/s11740-019-00924-0

Cited by 3 publications

(7 citation statements)

References 10 publications

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“…For example, mostly only cylindrical or spherical void geometries are considered, process variables are strongly simplified and no or insufficient validation is performed. [ 17,18 ]…”

Section: Void Closure Modelsmentioning

confidence: 99%

“…The resulting “Cicaporo” model provides a volume fraction of a void for linear strain and symmetric stress paths as a function of initial void geometry, initial void orientation, triaxiality, and effective strain. An extension by Hibbe et al [ 18 ] allows the application of the “Cicaporo” model for processes with changing load paths. The mesomechanical approach also provides the basis for other approaches that fully describe the stress state by taking the Lode parameter into account, thus improving accuracy for nonsymmetric stress states.…”

Section: Void Closure Modelsmentioning

confidence: 99%

“…In a recent publication in which Hibbe et al [ 18 ] extended the “Cicaporo” model to changing loading directions, the model was parameterized for the heat‐treatable steel AISI 4140. In their publication, a total of three orientations, six geometries, and nine triaxialities were investigated (162 RVE simulations in total).…”

Section: Void Closure Modelsmentioning

confidence: 99%

“…With the extended “Cicaporo” model by Hibbe et al, [ 18 ] void closure can also be described reliably in multipass forging processes. The prerequisite for this is that a stress state is present, which can be represented by the axisymmetric conditions in the RVE.…”

Section: Aim Of This Workmentioning

confidence: 99%

“…For example, mostly only cylindrical or spherical void geometries are considered, process variables are strongly simplified and no or insufficient validation is performed. [17,18] To overcome parts of these limitations, Saby et al [17] developed the so-called "Cicaporo" model based on a mesomechanical approach. This approach assumes that the voids are so much smaller compared to the workpiece that the void itself does not affect the global deformation in the workpiece.…”

Section: Void Closure Modelsmentioning

confidence: 99%

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Investigation on the Influence of Shear on Void Closure in Open‐Die Forging Processes

Gouverneur

Bailly

2022

steel research int.

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In addition to achieving a specific target geometry and good material properties, one of the main goals of open‐die forging is to eliminate internal casting‐related voids, as they can lead to a critical failure of the component during application. Models designed to predict void closure often use simplifying assumptions to have limited validity for more complex stress and strain conditions. Therefore, the complex incremental forming during open‐die forging leads to inaccurate predictions of conventional models. In order to consider the complex stress conditions—mainly defined by shearing—and predict void closure more accurately, an extended model for the “Cicaporo” void closure model is created using a representative volume element simulation study. For validation, an ingot of AISI4140 with artificially introduced voids is forged, the voids are subsequently examined by X‐Ray, and their residual void volume is compared with the results of the extended and original void closure model. The results show that the void volume calculated by the extended model agrees well with the real void volume, and hence the new approach considering shear, can provide a much more accurate representation of the void closure in open‐die forging.

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“…For example, mostly only cylindrical or spherical void geometries are considered, process variables are strongly simplified and no or insufficient validation is performed. [ 17,18 ]…”

Section: Void Closure Modelsmentioning

confidence: 99%

Section: Void Closure Modelsmentioning

confidence: 99%

Section: Void Closure Modelsmentioning

confidence: 99%

Section: Aim Of This Workmentioning

confidence: 99%

Section: Void Closure Modelsmentioning

confidence: 99%

See 3 more Smart Citations

Investigation on the Influence of Shear on Void Closure in Open‐Die Forging Processes

Gouverneur

Bailly

2022

steel research int.

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Integration of a void healing criterion in multi-scale modeling of hot rolling

Czempas,

Liebsch,

Hirt

2024

Advances in Industrial and Manufacturing Engineering

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Void-closing Behavior and Estimation Using Finite Element Analysis via Hydrostatic Integration in Hot Rolling of S10C Steel Plates

Ueshima

Oikawa

2023

ISIJ Int.

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The closure of large voids, whose thickness-to-void-height ratio exceeds 0.2, in S10C steel plates during hot rolling was investigated to determine whether hydrostatic integration (Q-value) can be used to predict the closing behavior of large voids. The steel plates with an open void along the rolling (RD), transverse (TD), and normal (ND) directions were hot rolled at 1 000 and 1 300°C with a target rolling reduction of 10% at each pass until 40% total target reduction. It was found that the effect of temperature on the closing behavior was negligibly small. RD and TD voids were almost entirely closed at a reduction of 40%, whereas ND voids could not be closed. The width of RD void was almost linearly decreased with reduction increase. TD void were closed at a lower reduction ratio than RD void. The thickness above and below the void was compressed after rolling in RD void but less reduced in TD void, which is presumable reason of the earlier closure of TD void. The FE analysis clarified that the void volume over initial volume (V/V 0 ) of the voids could be expressed as a function of the Q-value in the case of RD and TD voids. However, the closure behavior of the ND void cannot be expressed by the Q-value. These results indicate that the Q-value can be used to predict the closure of large voids in the RD and TD during rolling, although it cannot be used if the void shape is elongated in the compression direction.

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Investigation of void closure in open-die forging considering changing load directions

Cited by 3 publications

References 10 publications

Investigation on the Influence of Shear on Void Closure in Open‐Die Forging Processes

Investigation on the Influence of Shear on Void Closure in Open‐Die Forging Processes

Integration of a void healing criterion in multi-scale modeling of hot rolling

Void-closing Behavior and Estimation Using Finite Element Analysis via Hydrostatic Integration in Hot Rolling of S10C Steel Plates

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