Investigations on Residual Stress Generation in Extruded Steel Components

Jobst, Andreas; Kiener, Christoph; Merklein, Marion

doi:10.1007/978-3-662-60417-5_8

Cited by 9 publications

(10 citation statements)

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“…When using 1.4462 as part material, the die springback is not sufficient to plastically deform the part and the residual stresses are only changed in axial direction by shear stresses during ejection. This shows that both the part material and the particular process setup are influencing the residual stresses generation during extrusion [35]. An interesting material-dependent behaviour is also observed in hot forging.…”

Section: Difficulties Related To the Analysis Of The Formation Of Resmentioning

confidence: 76%

“…Therefore, the transferability of the results should be checked carefully, if a transfer of findings from one material to another is sought. An example related to the extrusion process is presented in [35]. Figure 3 shows the residual stresses after cold forward rod Material-dependent influence of ejection after cold forward extrusion on residual stresses [35] extrusion for two stainless steels, measured through X-ray diffraction.…”

Section: Difficulties Related To the Analysis Of The Formation Of Resmentioning

confidence: 99%

“…An example related to the extrusion process is presented in [35]. Figure 3 shows the residual stresses after cold forward rod Material-dependent influence of ejection after cold forward extrusion on residual stresses [35] extrusion for two stainless steels, measured through X-ray diffraction. For mild ferritic stainless steel 1.4016, the ejection of the part leads to a decrease in the tensile residual stresses in axial and tangential direction.…”

Section: Difficulties Related To the Analysis Of The Formation Of Resmentioning

confidence: 99%

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Strategies for residual stress adjustment in bulk metal forming

et al. 2021

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The family of bulk forming technologies comprises processes characterised by a complex three-dimensional stress and strain state. Besides shape and material properties, also residual stresses are modified during a bulk metal forming process. The state of residual stresses affects important properties, like fatigue behaviour and corrosion resistance. An adjustment of the residual stresses is possible through subsequent process steps such as heat treatments or mechanical surface modification technologies, like shot peening and deep rolling. However, these additional manufacturing steps involve supplementary costs, longer manufacturing times and harmful effects on the product quality. Therefore, an optimized strategy consists in a targeted introduction of residual stresses during the forming processes. To enable this approach, a fundamental understanding of the underlying mechanisms of residual stress generation in dependence of the forming parameters is necessary. The current state of the art is reviewed in this paper. Strategies for the manipulation of the residual stresses in different bulk forming processes are classified according to the underlying principles of process modification.

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Section: Difficulties Related To the Analysis Of The Formation Of Resmentioning

confidence: 76%

Section: Difficulties Related To the Analysis Of The Formation Of Resmentioning

confidence: 99%

Section: Difficulties Related To the Analysis Of The Formation Of Resmentioning

confidence: 99%

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Strategies for residual stress adjustment in bulk metal forming

et al. 2021

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“…Nach dem Umformschritt erfährt das Bauteil beim Ausstoßen eine zweite Verformung mit geringem Umformgrad. Infolgedessen werden die Zugeigenspannungen an der Oberfläche typischerweise verringert [7], wobei die Stärke dieses Effektes vom umgeformten Material abhängt [8]. Allerdings ist der Umformgrad beim Ausstoßen nicht ausreichend, um den randnahen Eigenspannungszustand effizient zu optimieren.…”

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Optimierung des Eigenspannungszustands kaltfließgepresster austenitischer Stähle durch einen kontrollierten Ausstoßvorgang

Jaeger

Franceschi

Hoche

et al. 2021

Forsch Ingenieurwes

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ZusammenfassungAusgehend von vorherigen Ergebnissen zur Prozessoptimierung fließgepresster Proben aus dem austenitischen Werkstoff 1.4404 mittels einer aktiven Prozessführung zur Verbesserung des Eigenspannungszustands, wurde das gleiche Verfahren auf den metastabilen austenitischen Werkstoff 1.4307 angewandt. Es wurden neue Erkenntnisse erwartet, da dieses Material bereits bei geringen Umformgraden zur Bildung von verformungsinduziertem Martensit neigt. Zum Vergleich der erwarteten Optimierung des Eigenspannungszustands wurden konventionell fließgepresste Proben hegestellt und spannungsarmgeglüht.Es wurde gezeigt, dass die Reduktion der Zugeigenspannungen durch die aktive Prozessführung beim 1.4307 insbesondere in der martensitischen Phase auftritt, während diese beim 1.4404 im Austenit erfolgt. Durch einen zusätzlichen Prozessschritt der Wärmebehandlung konventionell fließgepresster Proben werden ebenfalls Zugeigenspannungen abgebaut. Allerdings zeigt die Kaltumformung mit aktiver Prozessführung ein höheres Potenzial zur Verbesserung des Eigenspannungszustands.

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“…8. The residual stress change during ejection is caused by the movement of the formed shaft through the die land, whose diameter is reduced due to springback [31].…”

Section: Parametermentioning

confidence: 99%

Towards an holistic account on residual stresses in full-forward extruded rods

et al. 2021

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An holistic view is attempted towards prediction of the effect of residual stresses induced by full-forward extrusion on fatigue life of workpieces during operation. To study the effect of constitutive model on the accuracy of forming simulations, a combined nonlinear isotropic/kinematic hardening model as well as the isotropic hardening part of the same model are calibrated based on five compression-tension-compression uniaxial stress experiments. A full-forward extrusion finite element model is developed adapting both the aforementioned hardening plasticity models and the predicted residual stress states at the surface of the workpiece are compared against that of a corresponding forming experiment. Results show residual stress predictions of remarkable accuracy by the FE-models with the isotropic hardening model. The effect of residual stresses on fatigue life of the workpiece is qualitatively studied by uncoupled multiscale simulations featuring gradient crystal plasticity at the microscale. While the effective (homogenized) macroscale response indicates elastic response during a macroscopically cyclic loading, plasticity accompanying reduction of residual stresses is still present at the microscale within, e.g. grain boundaries.

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Investigations on Residual Stress Generation in Extruded Steel Components

Cited by 9 publications

References 0 publications

Strategies for residual stress adjustment in bulk metal forming

Strategies for residual stress adjustment in bulk metal forming

Optimierung des Eigenspannungszustands kaltfließgepresster austenitischer Stähle durch einen kontrollierten Ausstoßvorgang

Towards an holistic account on residual stresses in full-forward extruded rods

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