Abstract
Indentation fracture of a series of well-characterized WC-Co cermets was studied with a Vickers diamond pyramid indenter. The resulting crack length-indentation load data were analysed in terms of relations characteristic of radial (Palmqvist) and fully developed radial/median (half-penny) crack geometries. The radial crack model gave a better fit to the data on all the alloys studied. Crack shapes determined by repeated surface polishing confirmed the radial nature of the cracks. An indentation fracture mechanics analysis based on the assumption of a wedge-loaded crack is shown to be consistent with the observed linear relation between the radial crack length and the indentation load. The analysis also predicts a simple relation among the fracture toughness (K lc), the Palmqvist toughness (W) and the hardness (H) of the WC-Co alloys.
Similar content being viewed by others
References
J. Larsen-Basse,J. Metals 35 (11) (1983) 35.
E. A. Almond, in Proceedings of the International Conference on The Science of Hard Materials, Jackson, Wyoming, August 1981, edited by R. K. Viswandham, D. J. Rowcliffe, and J. Gurland (Plenum Press, New York, 1983) p. 517.
H. C. Lee andJ. Gurland,Mater. Sci. Eng. 33 (1978) 125.
J. R. Pickens andJ. Gurland,ibid. 33 (1978) 135.
I. G. Wright, D. K. Shetty andA. H. Clauer, in Proceedings of the 6th International Conference on Erosion by Liquid and Solid Impact, Cambridge, UK September 1983, edited by J. E. Field and N. S. Corney (Cavendish Laboratory, University of Cambridge, 1983) p. 63–1.
D. K. Shetty, I. G. Wright andJ. T. Stropki,Trans. ASLE 28 (1985) 5.
A. H. Clauer, I. G. Wright andD. K. Shetty, in Proceedings of the International Symposium on Metallography and Corrosion, Calgary, Canada, May 1983 to be published.
S. Palmqvist,Jernkontorets Ann. 141 (1957) 300.
Idem, Arch. Eisenhuettenw. 33 (1962) 629.
W. Dawihl andG. Altmeyer,Z. Metallkde 55 (1964) 231.
H. E. Exner,Trans. AIME 245 (1969) 677.
R. K. Viswanadham andJ. D. Venables,Met. Trans. 8A (1977) 187.
I. M. Ogilvy, C. M. Perrott andJ. W. Suiter,Wear 43 (1977) 239.
C. M. Perrott,ibid. 47 (1978) 81.
Idem, ibid. 45 (1977) 293.
“Fracture Toughness Testing and Its Applications”, ASTM Special Technical Publication No. 381 (American Society for Testing and Materials, 1965).
C. T. Peters,J. Mater. Sci. 14 (1979) 1619.
E. L. Exner, J. R. Pickens andJ. Gurland,Met. Trans. 9A (1978) 736.
S. S. Chiang, D. B. Marshall andA. G. Evans,J. Appl. Phys. 53 (1982) 298.
K. Niihara,J. Mater. Sci. Lett. 2 (1983) 221.
R. Warren andH. Matzke, in the Proceedings of the International Conference on The Science of Hard Materials, Jackson, Wyoming, August, (1981), edited by R. K. Viswanadham, D. J. Rowcliffe, and J. Gurland (Plenum, New York, 1983) p. 563.
J. Lankford,J. Mater. Sci. Lett. 1 (1982) 493.
K. Niihara, R. Morena andD. P. H. Hasselman,ibid. 1 (1982) 13.
B. R. Lawn, A. G. Evans andD. B. Marshall,J. Amer. Ceram. Soc. 63 (9–10) (1980) 574.
P. O. Snell andE. Parnama, in “Modern Developments in Powder Metallurgy”, edited by H. H. Hausner and W. E. Smith (American Powder Metallurgy Institute, Princeton, New Jersey, 1974) p. 664.
R. A. Cutler et al., Terra Tek Engineering, Final Report, NSF Grant No. DAR-7713273, July (1982).
G. I. Barenblatt,Adv. Appl. Mech. 7 (1962) 56.
J. Tweed,J. Elasticity 1 (1971) 29.
J. C. Newman Jr, in “Part-Through Crack Fatigue Life Prediction”, ASTM STP 687, edited by J. B. Chang (American Society for Testing and Materials, 1979) p. 16.
D. K. Shetty, A. R. Rosenfield, W. H. Duckworth andA. V. Virkar,J. Amer. Ceram. Soc. 67 (1984) C201.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Shetty, D.K., Wright, I.G., Mincer, P.N. et al. Indentation fracture of WC-Co cermets. J Mater Sci 20, 1873–1882 (1985). https://doi.org/10.1007/BF00555296
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00555296