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pure and applied geophysics

, Volume 141, Issue 2–4, pp 545–577 | Cite as

The strength and rheology of commercial tungsten carbide cermets used in high-pressure apparatus

  • Ivan C. Getting
  • Ganglin Chen
  • Jennifer A. Brown
Rheological Investigations

Abstract

Uniaxial compressive stress-strain curves have been measured on a suite of 26 commercial grades of tungsten carbide cermets and three maraging steels of interest for use in high-pressure apparatus. Tests were conducted on cylindrical specimens with a length to diameter ratio of two. Load was applied to the specimens by tungsten carbide anvils padded by extrudable lead disks. Interference fit binding rings of maraging steel were pressed on to the ends of the specimens to inhibit premature corner fractures. Bonded resistance strain gages were used to measure both axial and tangential strains. Deformation was exremely uniform in the central, gauged portion of the specimens. Tests were conducted at a constant engineering strain rate of 1×10−5s−1. The composition of the specimens was principally WC/Co with minor amounts of other carbides in some cases. The Co weight fraction ranged from 2 to 15%. Observed compressive strengths ranged from about 4 to just above 8 GPa. Axial strain amplitude at failure varied from ∼1.5% to ∼9%. Representative stress-strain curves and a ranking of the grades in terms of yield strength and strain at failure are presented. A power law strain hardening relation and the Ramberg-Osgood stress-strain equation were fit to the data. Fits were very good for both functions to axial strain amplitudes of about 2%. The failure of these established functions is accompanied by an abrupt change in the trend of volumetric strain consistent with the onset of substantial microcrack volume.

Key Words

Tungsten carbide strength rheology high pressure design 

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References

  1. Brace, W. F., Paulding, B. W., andScholz, C. (1966),Dilatancy in the Fracture of Crystalline Rocks, J. Geophys. Res.71, 3939–3953.Google Scholar
  2. Dol, H., Fujiwara, Y., andMiyake, K. (1969),Mechanism of Plastic Deformation and Dislocation Damping of Cemented Carbides, Trans. Met. Soc. of AIME245, 1457–1470.Google Scholar
  3. Exner, H. E. (1979),Physical and Chemical Nature of Cemented Carbides, International Metals Reviews4, 149–173.Google Scholar
  4. Exner, H. E., andGurland, J. (1970),A Review of Parameters Influencing Some Mechanical Properties of Tungsten Carbide-cobalt Alloys, Powder Metallurgy13, 13–31.Google Scholar
  5. Fischmeister, H. F., Schmauder, S., andSigl, L. S. (1988),Finite Element Modeling of Crack Propagatin in WC-Co Hard Metals, Mater. Sci. Engr. A105/106, 305–311.Google Scholar
  6. Godse, R., andGuriand, J. (1988),Applicability of the Critical Strain Fracture Criterion to WC-Co Hard Metals, Maten. Sci. Engr. A105-106, 331–336.Google Scholar
  7. Han, D., andMecholsky Jr., J. J. (1990),Fracture Analysis of Cobalt-Tungsten Carbide Composites, J. Mater. Sci.25, 4949–4956.Google Scholar
  8. Han, D., andMecholsky Jr, J. J. (1991),Fracture Behavior of Metal Particulate-reinforced WC-Co Composites, Mater. Sci. Engr. A144, 293–302.Google Scholar
  9. Hanabusa, T., Nishioka, K., andFujiwara, H. (1983),Criterion for the Triaxal X-ray Residual Stress Analysis, Z. Metallkde.74, 307–313.Google Scholar
  10. Hara, A., andIkeda, T. (1972),Behavior of Compressive Deformation of WC-Co Cemented Carbide, Trans. Jpn. Inst. Met.13, 129–133.Google Scholar
  11. Haygarth, J. C., andKennedy, G. C. (1967),Crushing Strength of Cemented Tungsten Carbide Pistons, Rev. Sci. Instru.38, 1590–1592.Google Scholar
  12. Janyaram, V., Kronenberg, A., andKirby, S. H. (1986),Plastic Deformation of WC-Co at High Confining Pressure, Scripta Metallurgica20, 701–705.Google Scholar
  13. Johannesson, B., andWarren, R. (1988),Subcritical Crack Growth and Plastic Deformation in the Fracture of Hard Metals, Mater. Sci. Engr. A.105/106, 353–361.Google Scholar
  14. Johansson, I., Persson, G., andHiltscher, R. (1970),Determination of Static and Fatigue Compressive Strength of Hard Metals, Powder Metallurgy13, 449–464.Google Scholar
  15. Kerper, M. J., Mong, L. E., Stiefel, M. B., andHolley, S. F. (1958),Evaluation of Tensile, Compressive, Torsional, Transverse, and Impact Tests and Correlation of Results for Brittle Cermets, J. Res. Nat. Bureau of Standards61, 149–169.Google Scholar
  16. Krawitz, A. D., Reichel, D. G., andHitterman, R. L. (1989),Residual Stress and Stress Distribution in a WC-Ni Composite, Mater. Sci. Engr. A119, 127–134.Google Scholar
  17. Krawitz, A. D., Roberts, R., andFaber, J.,Residual stress relaxation in cemented carbide composites. InProc. 2nd Int. Conf. on the Science of Hard Materials (ed. Almond, E. A., Brookes, C. A., and Warren, R.) (Adam Hilger Ltd., 1986) pp. 577-589.Google Scholar
  18. Laugier, M. T. (1988),Elevated Temperature Properties of WC-Co Cemented Carbides, Mater. Sci. Engr. A105/106, 363–367.Google Scholar
  19. Lamaitre, J., andChaboche, J.,Mechanics of Solid Materials (Cambridge University Press, Cambridge, 1990).Google Scholar
  20. Lubliner, J.,Plasticity Theory (Macmillan Publishing Co., New York, 1990).Google Scholar
  21. Nabarro, F. R. N., andVekins, G. (1988),Pre-compression, Internal Stresses and Coercivity in MC-Co, Mater. Sci. Engr. A105/106, 337–342.Google Scholar
  22. Paterson, M. S.,Experimental Rock Deformation, The Brittle Field (M. S., Springer-Verlag, New York, 1978).Google Scholar
  23. Pelepelin, V. M. (1965),Effect of Plastic Deformation of the Physicomechanical Properties of Tungsten Carbide-cobalt Hard Alloys, Poroshkovaya Metallurgica35, 76–82.Google Scholar
  24. Pelepelin, V. M. (1967),Variation in Density and Coefficient of Transverse Deformation of Hard Alloys, Poroshkovaya Metallurgica59, 108–110.Google Scholar
  25. Press, W. H., Flannery, B. P., Teuklsky, A. S., Vetterling, W. T.,Numerical Recipes in C, The Art of Scientific Computing (Cambridge University Press, Cambridge, 1988).Google Scholar
  26. Rowcliffe, D. J., Jayaram, V., Hibbs, M. K., andSinclair, R. (1988),Compressive Deformation and Fracture in WC Materials, Mater. Sci. Engr. A105/106, 299–303.Google Scholar
  27. Sarin, V. K., andJohannesson, T. (1975),On the Deformation of WC-Co Cemented Carbides, Metal Science9, 472–476.Google Scholar
  28. Schmid, H. G., Mari, D., Benoit, W., andBonjour, C. (1988),The Mechanical Behavior of Cemented Carbides at High Temperatures, Mater. Sci. Engr. A105/106, 343–451.Google Scholar
  29. Seely, F. B., andSmith, J. O.,Advanced Mechanics of Materials (John Wiley and Sons, Inc., New York, 1967).Google Scholar
  30. Shanley, F. R.,Strength of Materials (The Maple Press, York, PA 1957).Google Scholar
  31. Spiegler, R., andFischmeister, H. F. (1992),Prediction of Crack Paths in WC-Co Alloys, Acta Metall. Mater.40, 1653–1661.Google Scholar
  32. Suresh, S. (1988),The Failure of Hard Materials in Cyclic Compression: Theory, Experiments and Applications, Mater. Sci. Engr. A105/106, 323–329.Google Scholar
  33. Vandeput, R. R., andMastrantonis, N. (1988),A Comparison of the Strength of WC-Co Measured by Ring and Transverse Rupture Strength Specimens, Mater. Sci. Engr. A105/106, 423–428.Google Scholar
  34. Vasel, C. H., Krawitz, A. D., Drake, E. F., andKenik, E. A. (1985),Binder Deformation in WC-(Co, Ni) Cemented Carbide Composites, Metall. Trans. A16A, 2309–2317.Google Scholar
  35. Vekinis, G., andLuyckx, S. B. (1987),The Effects of Cyclic Precompression on the Magnetic Coercivity of WC-6wt%Co, Mater. Sci. Engr.96, L21-L23.Google Scholar

Copyright information

© Birkhäuser Verlag 1993

Authors and Affiliations

  • Ivan C. Getting
    • 1
  • Ganglin Chen
    • 1
  • Jennifer A. Brown
    • 1
    • 2
  1. 1.Cooperative Institute for Research In Environmental Science (CIRES)University of ColoradoBoulderUSA
  2. 2.Department of Geological SciencesUniversity of ColoradoBoulderUSA

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