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

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 mic...

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Bibliographic Details
Published in:Materials 2020-06, Vol.13 (12), p.2869
Main Authors: Strunz, Pavel, Kocich, Radim, Canelo-Yubero, David, Macháčková, Adéla, Beran, Přemysl, Krátká, Ludmila
Format: Article
Language:English
Subjects:
Agglomerates
Cold
Crystallography
Experiments
Grain size
Intermetallic compounds
Mechanical properties
Microstructure
Neutron diffraction
Neutrons
Optimization
Powder metallurgy
Residual stress
Room temperature
Rotary swaging
Shear strain
Sintering
Stress measurement
Swaging
Texture
Tungsten
Ultimate tensile strength
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Summary: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 ( fiber texture parallel to the swaging axis) and in the NiCo-based matrix ( fiber texture) after rotary swaging. Although usually of double-fiber texture, the 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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma13122869