Abstract
We have studied the mechanism of plastic deformation and fracture of tungsten-cobalt hard alloys over a broad range of compositions and grain sizes of the carbide phase in different stages of loading by uniaxial compression. We have shown that the behavior of each phase component is due to the cobalt content in the alloy and the tungsten carbide grain size. When the alloys are loaded to the yield stress, microcracks appear in them which are stopped at this stage by the deformed layers of the alloy. Residual strain of the hard alloys under uniaxial compression is the result of at least three deformation processes occurring in the alloys when they are loaded: slip along interphase and intergrain boundaries with the appearance of microcracks at this sites, slip in WC grains, and deformation of the cobalt phase. We conclude that slip in the cobalt phase is one of the basic mechanisms for its deformation when the alloys are loaded by compression.
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REFERENCES
M. G. Loshak, Strength and Durability of Hard Alloys [in Russian], Nauk. Dumka, Kiev (1984).
I. N. Chaporova, L. E. Pivovarov, V. A. Ivensen, et al., “Study of changes in the structure of WC-Co alloys during plastic deformation,” Poroshk. Metall., No. 5, 63–68 (1969).
R. Arndt, “Plasticity of hard metals based on WC-Co,” Metallkunde, No. 5, 274–280 (1972).
G. G. Travushkin, K. S. Chernyavskii, V. A. Fal'kovskii, and N. F. Koval'skaya, “Experimental study of the structural aspect of the origin of fracture in specimens of WC-20% Co hard alloys loaded by uniaxial compression,” Probl. Prochnosti, No. 7, 95–97 (1977).
V. K. Sarin and T. Johannesson, “On the deformation of WC-Co cemented carbides,” Metal. Sci., 472–476, October, (1975).
K. S. Chernyavskii and G. G. Travushkin, “Modern ideas about the relationship between structure and strength for WC-Co hard alloys (Review),” Probl. Prochnosti, No. 4, 11–19 (1980).
T. M. Golovins'ka and V. M. Pelepelin, “Structural changes in hard alloys with plastic deformation,” Dop. AN URSR, No. 10, 1340–1343 (1963).
H. E. Exner, “Physical and chemical nature of cemented carbides,” Int. Met. Rev., No. 4, 13–31 (1979).
G. S. Kreimer, Strength of Hard Alloys [in Russian], Metallurgiya, Moscow (1971).
K. S. Chernyavskii, G. G. Travushkin, Z. N. Sapronova, and A. A. Aleksandrovich, “Micromechanisms for deformation and fracture in successive stages of compressive loading of WC-Co hard alloys,” Probl. Prochnosti, No. 10, 53–62 (1993).
S. Bartolucci-Luycks, “Microscopic aspects of fracture in WC-Co alloys,” Acta Met., 16, 535–544 (1968).
J. Hong and J. Gurland, “A study of the fracture process of WC-Co alloys,” Sci. Hard Mater. Proc. Int. Conf. (August 23–28, 1981, Jachsonwill), Jachsonwill (1981), pp. 649–669.
H. Doi, “Behavior of hard alloys during deformation and the hardening mechanism,” J. Jpn. Soc. Powd. Met., 24, No.2, 33–42 (1977).
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Translated from Poroshkovaya Metallurgiya, Nos. 9–10(445), pp. 93–105, September–October, 2005.
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Aleksandrova, L.I., Bondarenko, V.P. & Loshak, M.G. Metallographic Aspects of Deformation and Fracture of Hard Alloys under Compression. Powder Metall Met Ceram 44, 489–498 (2005). https://doi.org/10.1007/s11106-006-0014-0
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DOI: https://doi.org/10.1007/s11106-006-0014-0