Formation of Twinned WC Grains during Carbonization of Eta Phase (W3Co3C)

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Twinned WC grains are sometimes observed in WC powder and sintered WC-Co alloys. The present investigation has studied the formation of twinned WC grains during carburization of an Eta phase. Eta grains were carburized at 700-1450°C for 1 min to 9 h. Twinned WC grains formed during the carburization. Crystallographic characterization of the formed twins were made using SEM and TEM. The formation of twins was found to be affected by the carbon activity during carburization. The twins formed under high carbon activities while no twins formed under low carbon activities. Two kinds of twins with different orientations were observed. The present experimental observation suggests that the twins formed via 2-dimensional nucleation and layer-bylayer growth on small WC clusters under high supersaturation and high driving force for the growth of WC grains.

Info:

Periodical:

Materials Science Forum (Volumes 534-536)

Edited by:

Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim

Pages:

1189-1192

Citation:

J. D. Kim et al., "Formation of Twinned WC Grains during Carbonization of Eta Phase (W3Co3C)", Materials Science Forum, Vols. 534-536, pp. 1189-1192, 2007

Online since:

January 2007

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$38.00

[1] J. Y. Ko, S. Y. Park, D. Y. Yoon and S. -J. L Kang, J. Am. Ceram. Soc., 87, 2262 (2004).

[2] D. N. French, Int. J. of Powder. Met., 5, 47-60 (1969).

[3] K. Takashima, Report of spring meeting of J. Jap. Inst. Met., 155 (1970).

[4] S. Lay, S. Hamar-Thibault and A. Lackner, pp.106-118 in 2001 Proceedings of the 15 th International Plansee Seminar, Reutte, Plansee AG, Austria, (2001).

[5] L. Pons, Plastic anisotropy in WC; Anisotropy in single crystal refractory compounds, edited by F.V. Vahldiek and J. Mersol, Plenum Press, New York, Vol 2 (1968) 393-444.

DOI: https://doi.org/10.1007/978-1-4899-5307-0

[6] M. Kobayashi and S. Yamaya, Proceedings of the 10th International Plansee Seminar, (Reutte, Plansee AG), 597-614 (1981).

[7] M. Sommer, W. D. Schubert, E. Zobetz, and P. Warbichler, Int. J of Refr. Met. & Hard Mater., 20, 41-50 (2002).

[8] L. Akesson, Ph. D. Thesis, Royal Institute of Technology, Stockholm, Sweden, (1982).

[9] I. V. Markov, Crystal Growth for Beginners; Ch. 3. 2, World Scientific, Singapore, (1995).

[10] B. K. Lee and S. -J. L. Kang, Acta Mater., 49, 1373-1381 (2001).

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