Characterization of metal-forming processes with respect to non-monotonity

Bobor, Kristóf; Krállics, György

doi:10.1088/1742-6596/240/1/012126

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…In an attempt to show the influence of deformation monotonicity on grain refinement, Bobor and Kralics demonstrated that ECAP and torsion differ from a monotonic deformation and argue that this condition results in more efficient grain refinement. This is because ECAP is characterized by a complex mode of deformation consisting of shear, tension, and compression components; hence, the deformation path is non‐stationary, a mode that enhances the deformation distribution (activates more and changing slip systems) while decreasing texture as deformation increases.…”

Section: Resultsmentioning

confidence: 99%

Severe Plastic Deformation by Equal Channel Angular Pressing and Rolling: The Influence of the Deformation Path on Strain Distribution

et al. 2017

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The present work compares two deformation techniques, rolling and Equal Channel Angular pressing (ECAP), and the response offered by three different materials that differ in Stacking Fault Energy (SFE): AA1010 Al, commercially pure Cu, and an austenitic stainless steel. The objective of this investigation is to study the effect of each deformation mode on tensile behavior, deformation mechanism, texture, and microstructure and to establish the influence of the stacking fault energy on said effects. The results show that the different strain paths of ECAP and rolling do not affect the strength, but rolling leads to an accentuated texture and thus to elastic and plastic anisotropy. This finding has practical relevance for micro manufacturing techniques. Furthermore, it is observed that lower SFE results in smaller domain size and higher dislocation density, which are microstructural details related to strength and to the work hardening capacity. Finally, both techniques are able to produce a high amount of high angle grain boundaries, a feature that characterizes refined microstructures. These processes operate at different strain rates; thus, in low SFE materials, a more effective grain fragmentation by deformation-induced twins is observed after the ECAP process.

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Section: Resultsmentioning

confidence: 99%

Severe Plastic Deformation by Equal Channel Angular Pressing and Rolling: The Influence of the Deformation Path on Strain Distribution

et al. 2017

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“…I.e., the ASR process, due to the combination of rolling and shear deformation, can be considered as non-monotonic. In contrast, the CR process has been reported to be monotonic [43].…”

Section: Microstructure Characterizationmentioning

confidence: 94%

Comparison of a low carbon steel processed by Cold Rolling (CR) and Asymmetrical Rolling (ASR): Heterogeneity in strain path, texture, microstructure and mechanical properties

Serrano-Muñoz

Ávalos

Schell

et al. 2021

Journal of Manufacturing Processes

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“…The mixture of different texture components in this process is a consequence of the combination of monotonic (rolling) and not monotonic (shearing) deformations which was confirmed by Ncorr and Abaqus calculations. It has been demonstrated by Bobor et al [50] that shearing can be considered as a not monotonic process which can lead not only to texture changes but also to microstructure modifications. This is coherent with other investigations in processes like rolling and asymmetrical rolling [51,52], where it was found the existence of shearing components in the edge vicinities while the rolling components were more intense in the sheet core.…”

Section: Texture Evolutionmentioning

confidence: 99%

Equal channel angular sheet extrusion (ECASE) as a precursor of heterogeneity in an AA6063-T6 alloy

Serrano-Muñoz

Higuera

Tartalini

et al. 2019

Int J Adv Manuf Technol

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We study the deformation inducing heterogeneity in an Aluminum alloy 6063-T6 in the form of a sheet processed at room temperature by Equal Channel Angular Sheet Extrusion (ECASE) up to a maximum equivalent strain of 1.86 following route C. The through thickness strain distribution showed higher strains in the edge vicinities than in the sheet core. The texture was heterogeneous between the edges and the sheet core with a strong Cube component in the initial deformation stages, and a rolling texture with the S component in the sheet edges. Different microstructural characteristic, like grain size, average misorientation and fraction of High Angle Grain Boundaries (HAGB) decreased by increasing the deformation. The Geometrically Necessary Dislocation (GND) calculations corroborated the existence of a heterogeneous microstructure along the sheet thickness, giving rise to gradients of plastic deformation which allowed to obtain a good strength-ductility relationship. It was demonstrated that ECASE process was a good alternative to produce heterogeneous microstructures. The material heterogeneity was found not to be randomly distributed across the sheet thickness but rather showing higher dislocation concentration and bigger grain size reductions in the edge's vicinities than in its middle zone.

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Characterization of metal-forming processes with respect to non-monotonity

Cited by 5 publications

References 6 publications

Severe Plastic Deformation by Equal Channel Angular Pressing and Rolling: The Influence of the Deformation Path on Strain Distribution

Severe Plastic Deformation by Equal Channel Angular Pressing and Rolling: The Influence of the Deformation Path on Strain Distribution

Comparison of a low carbon steel processed by Cold Rolling (CR) and Asymmetrical Rolling (ASR): Heterogeneity in strain path, texture, microstructure and mechanical properties

Equal channel angular sheet extrusion (ECASE) as a precursor of heterogeneity in an AA6063-T6 alloy

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