Abstract
A detailed study to assess the effect of surface roughness on three-point flexural strength of a WC-Co hardmetal was undertaken. Eight different types of surface finish were investigated;R-parameters were determined and Weibull statistics were applied to analyse the fracture strength results. It was concluded that the highest values of rupture stress and Weibull modulus are obtained when the surfaces and the edges of the specimens are submitted to careful and gradual, step-by-step, surface-finishing operations and a 1 μm diamond paste is used as the final abrasive. Only when very fine finish is attained may the results of rupture stress then represent the intrinsic behaviour of the material.
Similar content being viewed by others
References
J. L. Chermant, A. Deschanvres andF. Osterstock,Powder Metall. 2 (1977) 63.
M. W. Hawman, P. H. Cohen, J. C. Conway andR. N. Pangborn,J. Mater. Sci. 20 (1985) 482.
J. F. O. Ovri andT. J. Davies,J. Mater. Sci. Lett. 6 (1987) 849. 4. ISO 3372 (1982) “Metaux Durs — Determination de la Resistance a la Flexion”.
J. J. Fernandes, C. Pacheco Da Silva andL. Guerrarosa, in “Proceedings of III Jornadas de Fractura da Sociedade Portuguesa de Materiais”, Lisbon, November 1989, edited by C. M. Branco (Sociedade Portuguesa de Materiais, Lisbon, 1989) p. 8.
M. Steen, C. Saraiva Martins andJ. Bressers, in “Proceedings of the 5th National Meeting of Sociedade Portu guesa de Materiais”, Vol. 1, Lisbon, November 1991, edited by A. P. Loureiro, L. Guerra Rosa, M. Oliveira and M. E. Rosa, (Sociedade Portuguesa de Materiais, Lisbon, 1991) p. 385.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Fernandes, J.J., Da Silva, C.P., Rosa, L.G. et al. Effects of surface roughness on the flexural strength of a hardmetal. J Mater Sci 29, 2008–2012 (1994). https://doi.org/10.1007/BF01154674
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF01154674