Affecting Structure Characteristics of Rotary Swaged Tungsten Heavy Alloy Via Variable Deformation Temperature

Macháčková, Adéla; Krátká, Ludmila; Petrmichl, Rudolf; Kunčická, Lenka; Kocich, Radim

doi:10.3390/ma12244200

Cited by 36 publications

(27 citation statements)

References 33 publications

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“…The technology incrementally imposes substantial shear strain into the processed material and thus provides significant plastic deformation resulting in the elimination of residual porosity in the microstructure refinement and in the enhancement of mechanical and utility properties [27]. RS is not only suitable for processing of conventionally cast alloys but can also be favorably used to process composites, pseudoalloys, and sintered materials [28].…”

Section: Introductionmentioning

confidence: 99%

Texture and Differential Stress Development in W/Ni-Co Composite after Rotary Swaging

et al. 2020

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Knowledge of texture and residual stresses in tungsten heavy pseudoalloys is substantial for the microstructure optimization. These characteristics were determined in cold and warm rotary swaged W/NiCo composite with help of neutron diffraction. The results were discussed in view of the observed microstructure and mechanical properties. The investigated bars consisted of tungsten agglomerates (bcc lattice) surrounded by NiCo-based matrix (fcc lattice). No preferential crystallographic orientation was found in the as-sintered bar. A strong texture was formed in both the tungsten agglomerates (<101> fiber texture parallel to the swaging axis) and in the NiCo-based matrix (<111> fiber texture) after rotary swaging. Although usually of double-fiber texture, the <001> fiber of the fcc structures was nearly missing in the matrix. Further, the cold-swaged bar exhibited substantially stronger texture for both phases which corresponds to the higher measured ultimate tensile strength. The residual stress differences were employed for characterization of the stress state of the bars. The largest residual stress difference (≈400 MPa) was found at the center of the bar deformed at room temperature. The hoop stresses were non-symmetrical with respect to the swaging axis, which was likely caused by the elliptical cross section of the as-sintered bar.

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Section: Introductionmentioning

confidence: 99%

Texture and Differential Stress Development in W/Ni-Co Composite after Rotary Swaging

et al. 2020

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“…Axisymmetric quadrilateral full integration elements were chosen to develop the finite element analysis (FEA) model of rotary swaging for an Mg alloy [11]. FEA was conducted for the tungsten heavy alloy using FORGE software; the highest strain was observed in the surface regions, which were directly affected by the swaging dies [12]. Using Forge NxT commercial software, FEA was conducted for an elastic-viscoplastic material model [12].…”

Section: Introductionmentioning

confidence: 99%

“…FEA was conducted for the tungsten heavy alloy using FORGE software; the highest strain was observed in the surface regions, which were directly affected by the swaging dies [12]. Using Forge NxT commercial software, FEA was conducted for an elastic-viscoplastic material model [12]. [2] and (b) the zones of the swaging process [3], with permission from Elsevier, 2020.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis and Experimental Evaluation of Residual Stress of Zr-4 alloys Processed through Swaging

Singh

Kalita

Narayanan³

et al. 2020

Metals

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Zirconium alloy has been extensively used as a cladding material in nuclear power reactors due to its low neutron absorption cross section, excellent mechanical properties, and corrosion resistance. The influence of the swaging parameter, feed rate (0.7, 1.25, 2 m/min) on residual stress induced in Zr-4 alloy is investigated in the present work. A three-dimensional finite element model was implemented in the Deform 3D software to simulate the rotary swaging (RS) process over a circular rod of Zr-4 alloy. The simulation results based on the 3D framework provide a detailed insight of residual stress, true stress versus true strain and force applied over the rod during the multiple pass swaging process; the results are compared with experimental results. The experimental hole drilling method is used to determine the residual stresses on swaged zirconium alloy at different feed rates (0.7, 1.25, and 2 m/min). A similar trend of residual stress between experimental and numerical results from the surface to the center on the swaged rod samples is observed. The same magnitude of residual stress at the surface of the swaged Zr-4 rod is also observed. It is found to be compressive at the surface and tensile in the center of the samples, as observed in the present work.

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“…These are usually manufactured by milling. The grain size distribution and morphology of the grains have fundamental effects not only on the sintering process itself, as mentioned by Wang et al [15], but also on the final structure of the alloys as described by Macháčková et al [16]. Surzhenkov et al studied the wear resistance and mechanisms of abrasion during milling.…”

Section: Introductionmentioning

confidence: 99%

Effect of Imposed Shear Strain on Steel Ring Surfaces during Milling in High-Speed Disintegrator

et al. 2020

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This contribution characterizes the performance of a DESI 11 high-speed disintegrator working on the principle of a pin mill with two opposite counter-rotating rotors. As the ground material, batches of Portland cement featuring 6–7 Mohs scale hardness and containing relatively hard and abrasive compounds with the specific surface areas ranging from 200 to 500 m2/kg, with the step of 50 m2/kg, were used. The character of the ground particles was assessed via scanning electron microscopy and measurement of the absolute/relative increase in their specific surface areas. Detailed characterization of the rotors was performed via recording the thermal imprints, evaluating their wear by 3D optical microscopy, and measuring rotor weight loss after the grinding of constant amounts of cement. The results showed that coarse particles are ground by impacting the front faces of the pins, while finer particles are primarily milled via mutual collisions. Therefore, the coarse particles cause higher abrasion and wear on the rotor pins; after the milling of 20 kg of the 200 m2/kg cement sample, the wear of the rotor reached up to 5% of its original mass and the pins were severely damaged.

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Affecting Structure Characteristics of Rotary Swaged Tungsten Heavy Alloy Via Variable Deformation Temperature

Cited by 36 publications

References 33 publications

Texture and Differential Stress Development in W/Ni-Co Composite after Rotary Swaging

Texture and Differential Stress Development in W/Ni-Co Composite after Rotary Swaging

Finite Element Analysis and Experimental Evaluation of Residual Stress of Zr-4 alloys Processed through Swaging

Effect of Imposed Shear Strain on Steel Ring Surfaces during Milling in High-Speed Disintegrator

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