The Influence of Cyclic Sintering on the Structure and Mechanical Properties of Tungsten Heavy Alloy

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Abstract

The results of structure and mechanical properties investigations of tungsten heavy alloy (THA) after cyclic sintering are presented. The material for study was prepared using liquid phase sintering of mixed and compacted powders in hydrogen atmosphere. The specimens in shape of rods were subjected to different number of sintering cycles according to the heating schemes given in the main part of the paper From the specimens the samples for mechanical testing and structure investigations were prepared. It follows from the results of the mechanical studies, that increasing of sintering cycles lead to decrease of tensile strength and elongation of THA with either small or no influence on yield strength. In opposite to that, the microstructure observations showed that the size of tungsten grain increases with number of sintering cycles. Moreover, scanning electron microscope (SEM) observations revealed distinctly more trans-granular cleavage mode of fracture in specimens subjected to large number of sintering cycles compared with that after one or two cycles only.

[1] Germam, R.M. (1992). Proc. International Conference on Tungsten and Tungsten Alloys, eds. A. Bose and R.J. Dowling, MPIF, Princeton, New Jersey, pp. 3-12.

[2] Magness, L.S. (1995). Proc. International Conference on Tungsten and Tungsten Alloys, ds. A. Bose and R.J. Dowling, MPIF, Princeton, New Jersey, pp. 133-142.

[3] Kaczorowski, M., Skoczylas, P. & Krzyńska, A. (2011). The influence of Fe content on spreading ability of tungsten heavy alloys matrix on tungsten surface. Archives of Foundry Engineering. 11(3), 103-106.

[4] Kaczorowski, M., Skoczylas, P. (2015). Formation of structure and properties of tungsten heavy alloys of special purpose. Problemy Mechatroniki. pp. 27-40. Uzbrojenie, lotnictwo, Inżynieria Bezpieczeństwa.

[5] Cordwell, J.E., Hull D. (1971). Observation of {110} cleavage in <110> axis tungsten single crystals, 26(1), pp. 215-224.

[6] Riedle, J., Gumbsch, P., Fischmeister, H.F., Glebovsky, V.G. & Semenov, V.N. (1994). Fracture studies of tungsten single crystals. Materials Letter. 20(5-6), 311-317.

[7] (1978). Metals Handbook vol.12 Fractography, Ninth Edition, Metals Park, Ohio.

[8] Kaczorowski, M., Skoczylas, P. & Nowak, W. (2008). The study of precipitation hardening of weight heavy alloys matrix. Archives of Foundry Engineering. 34(1), 169-174.

[9] Kaczorowski, M., Skoczylas, P., Krzyńska, A. & Kaniewski, J. (2012). The strengthening of weight heavy alloys during heat treatment, Archives of Foundry Engineering. 12(4), 75-80.

[10] German, R.M., Suri, P., Park, S.J. (2009). Review: Liquid Phase Sintering. Journal of Materials Science. 44, 1-39.

Archives of Foundry Engineering

The Journal of Polish Academy of Sciences

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CiteScore 2016: 0.42

SCImago Journal Rank (SJR) 2016: 0.192
Source Normalized Impact per Paper (SNIP) 2016: 0.316

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