Neutron Diffraction Study of Residual Stresses in a W–Ni–Co Heavy Alloy Processed by Rotary Swaging at Room and High Temperatures

Canelo-Yubero, David; Kocich, Radim; Hervoches, Charles H.; Strunz, Pavel; Kunčická, Lenka; Krátká, Ludmila

doi:10.1007/s12540-020-00963-8

Cited by 13 publications

(7 citation statements)

References 41 publications

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“…Regarding the differences between the consolidated structures, i.e., the HRS and CRS samples, the final swaging performed at the elevated temperature can be supposed to provide a structure featuring a higher plasticity compared to a structure finally swaged at room temperature, and thus also a lower flow stress [ 76 ]. However, the comparison of the experimentally acquired flow stress curves shown in Figure 6 b,c reveals that the flow stress levels for both the HRS and CRS composites were comparable.…”

Section: Resultsmentioning

confidence: 99%

Influence of Structure Development on Performance of Copper Composites Processed via Intensive Plastic Deformation

2023

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Designing a composite, possibly strengthened by a dispersion of (fine) oxides, is a favorable way to improve the mechanical characteristics of Cu while maintaining its advantageous electric conductivity. The aim of this study was to perform mechanical alloying of a Cu powder with a powder of Al2O3 oxide, seal the powder mixture into evacuated Cu tubular containers, i.e., cans, and apply gradual direct consolidation via rotary swaging at elevated temperatures, as well as at room temperature (final passes) to find the most convenient way to produce the designed Al2O3 particle-strengthened Cu composite. The composites swaged with the total swaging degree of 1.83 to consolidated rods with a diameter of 10 mm were subjected to measurements of electroconductivity, investigations of mechanical behavior via compression testing, and detailed microstructure observations. The results revealed that the applied swaging degree was sufficient to fully consolidate the canned powders, even at moderate and ambient temperatures. In other words, the final structures, featuring ultra-fine grains, did not exhibit voids or remnants of unconsolidated powder particles. The swaged composites featured favorable plasticity regardless of the selected processing route. The flow stress curves exhibited the establishment of steady states with increasing strain, regardless of the applied strain rate. The electroconductivity of the composite swaged at elevated temperatures, featuring homogeneous distribution of strengthening oxide particles and the average grain size of 1.8 µm2, reaching 80% IACS (International Annealed Copper Standard).

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Section: Resultsmentioning

confidence: 99%

Influence of Structure Development on Performance of Copper Composites Processed via Intensive Plastic Deformation

2023

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“…Nevertheless, the ability to introduce a highly efficient grain refinement is not the only advantage of the IPD and SPD shear strain-based methods. Among their advantages are also that they introduce predominantly compressive stress states, can be optimized to modify/control the state of residual stress [49,50], enable the reduction/elimination of the presence of voids and residual porosity [51], and many more. Therefore, IPD and SPD methods are also highly advantageous for processing materials with challenging formability [52,53], multiphase materials [54][55][56], shape memory alloys [57,58], or various composites [59,60].…”

Section: Methods Of Grain Refinementmentioning

confidence: 99%

Structural Phenomena Introduced by Rotary Swaging: A Review

Kunčická

2024

Materials

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Rotary swaging is an industrially applicable intensive plastic deformation method. Due to its versatility, it is popular, especially in the automotive industry. Similar to the well-known methods of severe plastic deformation (SPD), rotary swaging imparts high shear strain into the swaged materials and thus introduces grain refinement down to a very fine, even ultra-fine, level. However, contrary to SPD methods, one of the primary characteristics of which is that they retain the shapes and dimensions of the processed sample, rotary swaging enables the imparting of required shapes and dimensions of workpieces (besides introducing structure refinement and the consequent enhancement of properties and performance). Therefore, under optimized conditions, swaging can be used to process workpieces of virtually any metallic material with theoretically any required dimensions. The main aim of this review is to present the principle of the rotary swaging method and its undeniable advantages. The focus is primarily on assessing its pros and cons by evaluating the imparted microstructures.

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“…They can also (positively) alter the residual stress state, reduce/eliminate possible presence of voids and porosity, etc. [15][16][17][18]. Moreover, the favorable combination of shear strain and compressive stress is advantageous for direct consolidation of powder-based workpieces [19].…”

Section: Introductionmentioning

confidence: 99%

Direct consolidation of an oxide dispersion strengthened alloy by hot rotary swaging

Kunčická,

Svoboda

2024

Materialwissenschaft Werkst

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Steels strengthened by alloying elements and precipitates typically maintain their enhanced properties up to the ferrite‐austenite transformation. However, oxide dispersion strengthened ferritic steels are creep resistant even at much higher temperatures given by dispersions of nanosized oxides. To ensure homogeneous dispersion of the oxides, powder metallurgy is used for preparation of the original material. The presented study investigates the effects of direct consolidation of powder of ferritic steel strengthened with yttrium oxide nanoparticles. The powders were mechanically alloyed and sealed into evacuated steel containers, which were subjected to gradual hot consolidation via the industrially applicable intensive plastic deformation method of rotary swaging. Investigations assessing the effects of several reduction ratios showed that the direct consolidation of the oxide dispersion strengthened steel was successful – in the macroscale – at the swaging ratio of 1.03; the quality of consolidation further increased with increasing swaging ratio. At the swaging ratio of 1.83, the consolidated bulk material featured ultra‐fine grains characterized with high angle grain boundaries, homogeneous dispersion of oxide precipitates, and the average Vickers microhardness of 706.6 HV 1.

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Neutron Diffraction Study of Residual Stresses in a W–Ni–Co Heavy Alloy Processed by Rotary Swaging at Room and High Temperatures

Cited by 13 publications

References 41 publications

Influence of Structure Development on Performance of Copper Composites Processed via Intensive Plastic Deformation

Influence of Structure Development on Performance of Copper Composites Processed via Intensive Plastic Deformation

Structural Phenomena Introduced by Rotary Swaging: A Review

Direct consolidation of an oxide dispersion strengthened alloy by hot rotary swaging

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