Physical and Technical Foundations of the Use of Alternating Free Bending for Producing Long-length Semi-products from Metals and Alloys with Improved Mechanical Properties

Raab, Georgy; Utyashev, F. Z.; Asfandiyarov, R. N.; Рааб, А. Г.; Аксенов, Д. А.; Kodirov, I. S.; Janeček, Miloš; Krajňák, Tomáš

doi:10.3390/met10070879

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…An example of such a process is the pressing of a rod in intersecting channels with an elliptical cross section executed with the possibility of their relative rotation in the junction plane at the circular cross sections, [ 32 ] as well as drawing with bending. [ 33 ]…”

Section: Discussionmentioning

confidence: 99%

Large and Severe Plastic Deformation of Metals: Similarities and Differences in Flow Mechanics and Structure Formation

2021

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Large and severe plastic deformations (SPD) are two widely known approaches for the processing of metallic billets that have a different effect on the microstructure and physicoÀmechanical properties of materials. After a large deformation is implemented, for example, by longitudinal rolling or drawing, dislocation substructure cells and microbands are formed in billets. As a result of SPD, in particular, after equal-channel angular pressing (ECAP), ultrafine nanoscale grains are formed in metals, [1,2] which provides their high mechanical and functional properties. Herein, in both cases, structure formation is largely conditioned by the patterns in the mechanics of plastic deformation. The difference in the produced microstructures is determined by different scalar and vector characteristics of large and severe strains. In the former case, monotonic strain accumulation takes place in a billet. In the latter case, due to the active nonmonotonic deformation of a billet, heavy strain is accumulated, and rotational modes are realized, which, as a result, produces shear bands with further formation of ultrafine grains with high-angle grain boundaries. As a conclusion, a more precise definition of SPD is introduced, and recommendations are given for increasing the efficiency of the process of UFG structure formation in metals.

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Section: Discussionmentioning

confidence: 99%

Large and Severe Plastic Deformation of Metals: Similarities and Differences in Flow Mechanics and Structure Formation

2021

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“…One of the SPD techniques that overcame the issue presented above is the method of free bending in rotating rollers developed recently by Raab et al [12]. In this technique, the material is processed through the set of rollers, which significantly reduce the friction forces acting during the processing and allow for the processing of long billets at higher speeds, as in the case of the other SPD methods.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution in Cu–0.5 wt% Zr Alloy Processed by a Novel Severe Plastic Deformation Technique of Rotational Constrained Bending

Krajňák

Janeček

Minárik

et al. 2020

Metals

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In the present study, a coarse-grained Cu–0.5 wt% Zr alloy was repeatedly processed by a novel technique of rotational constrained bending (RCB). In this technique, the workpiece was deformed by bending in a channel with an angle of 90°, using a rotating roller. The influence of the number of passes (N) of RCB on strain distribution, microstructure evolution and mechanical properties of the alloy was investigated. The heterogeneous distribution of the microhardness in the billet cross-section after the first pass was transformed into a homogeneous one after twelve passes, due to the rotation of the sample by 90° clockwise between individual passes. In addition, the gradual refinement/homogenization of the microstructure and formation of strong (110) crystallographic texture were found with increasing N. The initial grain size of 180 μm decreased down to 3.4 μm after twelve passes. The dislocation density increased by two orders of magnitude after RCB processing. In accordance with the grain-size refinement and the strong increase of the dislocation density, RCB processing significantly enhanced the strength of the alloy, while the ductility considerably decreased. The yield stress increased from 63 to 524 MPa, while the elongation to failure decreased below 10% after twelve passes.

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Microstructure Evolution and Mechanical Properties of cp-Ti Processed by a Novel Technique of Rotational Constrained Bending

Krajňák

Janeček

Minárik

et al. 2021

Metall Mater Trans A

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Physical and Technical Foundations of the Use of Alternating Free Bending for Producing Long-length Semi-products from Metals and Alloys with Improved Mechanical Properties

Cited by 4 publications

References 23 publications

Large and Severe Plastic Deformation of Metals: Similarities and Differences in Flow Mechanics and Structure Formation

Large and Severe Plastic Deformation of Metals: Similarities and Differences in Flow Mechanics and Structure Formation

Microstructure Evolution in Cu–0.5 wt% Zr Alloy Processed by a Novel Severe Plastic Deformation Technique of Rotational Constrained Bending

Microstructure Evolution and Mechanical Properties of cp-Ti Processed by a Novel Technique of Rotational Constrained Bending

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