Effect of Swaging Temperature on Deformation Behaviour of W93Ni6Co1 Tungsten Heavy Alloy

Abstract:

The study investigates a W93Ni6Co1 tungsten heavy alloy rotary swaged at 20 °C and 900 °C with the aim to optimize its mechanical properties. Deformation behaviour was predicted via numerical simulations and subsequently verified via experimental swaging. The results showed that swaging at 900 °C led to substantial increase in ductility (24% elongation after the first pass), whereas swaging at room temperature primarily increased the UTS (up to 1800 MPa after the second pass). Among the key differences between both the swaging temperature modes were the different substructure developments; the higher swaging temperature imparted activation of softening processes within the γ matrix and homogenization of residual stress. The W agglomerates within both the swaged pieces featured the presence of <101> and <001> preferential orientations.

• Periodical: Key Engineering Materials (Volume 865)
• Pages: 91-96
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.865.91
• Online since: September 2020
• Authors: Lenka Kunčická*, Radim Kocich
• Keywords: Microstructure, Numerical Analysis, Residual Stress, Rotary Swaging, Tungsten Alloys

References

[1] L. Kunčická, R. Kocich, C. Hervoches, A. Macháčková, Study of structure and residual stresses in cold rotary swaged tungsten heavy alloy, Mater. Sci. Eng. A. 704 (2017) 25–31.

DOI: 10.1016/j.msea.2017.07.096

[2] D. Rittel, G., Weisbrod, Dynamic fracture of tungsten base heavy alloys, Int. J. Fract. 112 (2001) 87-98.

[3] D. Handtrack, B. Tabernig, H. Kestler, P. Pohl, W. Glatz, L.S. Sigl, Tungsten Heavy Alloys for Collimators and Shieldings, 18th International Plansee Seminar, Reutte, Austria, (2013).

[4] R. Kocich, L. Kunčická, D. Dohnalík, A. Macháčková, M. Šofer, Cold rotary swaging of a tungsten heavy alloy: Numerical and experimental investigations, Int. J. Refract. Met. Hard Mater. 61 (2016) 264–272.

DOI: 10.1016/j.ijrmhm.2016.10.005

[5] U. Ravi Kiran, J. Kumar, V. Kumar, M. Sankaranarayana, G.V.S. Nageswara Rao, T.K. Nandy, Effect of cyclic heat treatment and swaging on mechanical properties of the tungsten heavy alloys, Mater. Sci. Eng. A. 656 (2016) 256-265.

DOI: 10.1016/j.msea.2016.01.024

[6] N. Durlu, N.K. Caliskan, B. Sakir, Effect of swaging on microstructure and tensile properties of W-Ni-Fe alloys, Int. J. Refract. Met. Hard Mater. 42 (2014) 126-131.

DOI: 10.1016/j.ijrmhm.2013.08.013

[7] L. Kunčická, T.C. Lowe, C.F. Davis, R. Kocich, M. Pohludka, Synthesis of an Al/Al2O3 composite by severe plastic deformation, Mater. Sci. Eng. A. 646 (2015) 234–241.

DOI: 10.1016/j.msea.2015.08.075

[8] R. Kocich, M. Greger, A. Macháčková, Finite element investigation of influence of selected factors on ECAP process, in: Metal 2010 19th 19th international metallurgical and materials conference, Tanger Ltd., 2010: p.166–171.

[9] A.B. Naizabekov, V.A. Andreyachshenko, R. Kocich, Study of deformation behavior, structure and mechanical properties of the AlSiMnFe alloy during ECAP-PBP, Micron 44 (2013) 210-217.

DOI: 10.1016/j.micron.2012.06.011

[10] R. Kocich, L. Kunčická, A. Macháčková, Twist Channel Multi-Angular Pressing ( TCMAP ) as a method for increasing the efficiency of SPD, IOP Conf. Ser. Mater. Sci. Eng. 63 (2014) 12006.

DOI: 10.1088/1757-899x/63/1/012006

[11] R. Kocich, A. Macháčková, F. Fojtík, Comparison of strain and stress conditions in conventional and ARB rolling processes, Int. J. Mech. Sci. 64 (2012) 54–61.

DOI: 10.1016/j.ijmecsci.2012.08.003

[12] R. Kocich, A. Macháčková, L. Kunčická, F. Fojtík, Fabrication and characterization of cold-swaged multilayered Al–Cu clad composites, Mater. Des. 71 (2015) 36-47.

DOI: 10.1016/j.matdes.2015.01.008

[13] B. Katavić, Z. Odanović, M. Burzić, Investigation of the rotary swaging and heat treatment on the behavior of W- and γ-phases in PM 92.5W-5Ni-2.5Fe-0.26Co heavy alloy, Mater. Sci. Eng. A 492 (2008) 337-345.

DOI: 10.1016/j.msea.2008.05.021

[14] R. Kocich, L. Kunčická, P. Král, P. Strunz, Characterization of innovative rotary swaged Cu-Al clad composite wire conductors, Mater. Des. 160 (2018) 828–835.

DOI: 10.1016/j.matdes.2018.10.027

[15] R. Liu, Z.M. Xie, X. Yao, T. Zhang, X.P. Wang, T. Hao, Q.F. Fang, C.S. Liu, Effects of swaging and annealing on the microstructure and mechanical properties of ZrC dispersion-strengthened tungsten, Int. J. Refract. Met. Hard Mater. 76 (2018) 33–40.

DOI: 10.1016/j.ijrmhm.2018.05.018

[16] F.-Z. Wang, H. Zhang, B.-J. Ding, R.-H. Zhu, A thermionic tungsten cathode activated with nanothoria and prepared by swaging method, Mater. Sci. Eng. A. 336 (2002) 59–63.

DOI: 10.1016/s0921-5093(01)01969-4

[17] B. Beausir, J.J. Fundenberger, Analysis Tools for Electron and X-ray diffraction, ATEX - software, www.atex-software.eu, (2017).

[18] B. Verlinden, J. Driver, I. Samajdar, R.D. Doherty, Thermo-mechanical processing of metallic materials, Elsevier Ltd, Amsterdam, (2007).

[19] F.J. Humphreys, M. Hetherly, Recrystallization and Related Annealing Phenomena, 2nd ed., Elsevier Ltd, Oxford, (2004).

[20] C.-L. Chen, S.-H. Ma, Effects of Ni/Co ratio and mechanical alloying on characteristics and sintering behavior of W-Ni-Co tungsten heavy alloys, J. Alloys Compd. 711 (2017) 488–494.

DOI: 10.1016/j.jallcom.2017.04.037