Effect of thermomechanical processing via rotary swaging on properties and residual stress within tungsten heavy alloy

0524004 - ÚFM 2021 RIV GB eng J - Journal Article
Kunčická, Lenka - Macháčková, A. - Lavery, N.P. - Kocich, R. - Cullen, J.C.T. - Hlaváč, L. M.
Effect of thermomechanical processing via rotary swaging on properties and residual stress within tungsten heavy alloy.
International Journal of Refractory Metals & Hard Materials. Roč. 87, FEB (2020), č. článku 105120. ISSN 0263-4368. E-ISSN 2213-3917
R&D Projects: GA ČR(CZ) GA19-15479S
Institutional support: RVO:68081723
Keywords : mechanical-properties * clad composite * behavior * microstructure * strain * parameters * evolution * fracture * Tungsten heavy alloys * Finite element analysis * Stress/strain measurements * Electron microscopy * X-ray analysis
OECD category: Materials engineering
Impact factor: 3.871, year: 2020
Method of publishing: Open access
https://doi.org/10.1016/j.ijrmhm.2019.105120

The effects of cold and warm rotary swaging and subsequent post-process annealing on mechanical properties, residual stress, and structure development within WNiCo powder-based pseudo-alloy were predicted numerically and investigated experimentally. The swaging temperature of 900 degrees C imparted increase in the Young's and shear moduli, the post-process annealing at 900 degrees C also imparted decrease in the residual stress values, primarily due to structure recovery introduced within the matrix. Cold rotary swaging at 20 degrees C imparted ultimate tensile strength of almost 1 900 MPa, while warm rotary swaging at 900 degrees C introduced increased plasticity (almost 24 % after a single swaging pass). Post-process heat treatment promoted diffusion of W to the Ni/Co matrix, which increased strength, but remarkably decreased elongation to failure and residual stress. Numerically predicted results of mechanical behaviour corresponded to the experimental results and confirmed the favourable effects of the selected thermomechanical treatments on WNiCo performance.
Permanent Link: http://hdl.handle.net/11104/0308318