Abstract
Residual stresses were studied in tungsten heavy alloy bars produced by powder metallurgy and deformed by rotary swaging at room temperature (RT) and at 900 °C. Neutron diffraction technique was used to scan the residual stresses across the bars. Both tungsten particles and NiCo2W solid solution matrix were analysed. Maximum axial stresses of ~ 300 MPa and ~ 200 MPa were observed for the tungsten phase at the centre in the RT and in the high-temperature deformed samples, respectively. Compressive residual axial stresses were found close to the sample surface, showing that rotary swaging is a suitable deformation method for tungsten heavy alloys to provide an appropriate surface modification for its use in metallic parts undergoing, e.g., fatigue. Residual stresses developed in the NiCo2W-phase are larger than those found in the tungsten particles although with a secondary role in the overall equilibrium conditions due to its lower strength and smaller volume fraction. Total stresses for each phase were separated into macro- and microstresses. Macrostresses can be mainly influenced by the incompatibility of the elliptical cross-section of the sintered sample with the head of the rotary machine while microstresses are mainly developed by the elastic mismatch between the constituent phases.
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Acknowledgements
DC-Y, RK, CH, LK, and LK acknowledge the support by the Czech Science Foundation (Project No. 19-15479S). The authors also acknowledge CANAM infrastructure of the NPI CAS Řež supported through the Ministry of Education, Youth and Sports Project No. LM2015056 as well as the infrastructure Reactors LVR-15 and LR-0 supported by Project LM2018120 of the Ministry of Education, Youth and Sports of the Czech Republic. PS acknowledges the Project ESS participation of the Czech Republic (CZ.02.1.01/0.0/0.0/16_013/0001794).
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Canelo-Yubero, D., Kocich, R., Hervoches, C. et al. Neutron Diffraction Study of Residual Stresses in a W–Ni–Co Heavy Alloy Processed by Rotary Swaging at Room and High Temperatures. Met. Mater. Int. 28, 919–930 (2022). https://doi.org/10.1007/s12540-020-00963-8
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DOI: https://doi.org/10.1007/s12540-020-00963-8