Resistance of Cemented Carbides to Sliding Abrasion: Role of Binder Metal
Cemented carbides of the WC-Co, WC-FeNi and TiC-MoNi families were studied. Laboratory abrasion test results for hard and soft abrasives were compared with SEM studies of removal mechanisms and with hardness and Palmquist crack resistance data.
In wear by hard abrasives material is removed from the wear surface by a mechanism involving gross plastic deformation due to yielding and extrusion of binder metal and/or by a mechanism of spalling due to crack propagation in the binder metal. In wear by soft abrasives material is removed by a series of microprocesses involving extrusion of binder followed by relaxation of compressive stresses in the carbide grains and subsequent cracking and fragmentation of these grains. In systems where the diffusion or mechanical bond between binder and carbide is weak whole grains may be pulled from the wear surface. In systems where a strong diffusion bond exists between the two phases material may be removed by brittle spalling due to cracks propagating through both phases. Under some wear conditions binder metal may be smeared back onto the wear surface. In the case of cobalt this may provide a lubricating, wear reducing effect.
KeywordsWear Rate Free Path Wear Surface Material Removal Rate Abrasive Wear
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- 1.J. Larsen-Basse and P. A. Tanouye, “Abrasion of WC-Co Alloys by Loose Hard Abrasives,” in: Proc. 1976 Int. Conf. on Hard Material Tool Technology, R. Kamanduri, ed., Carnegie-Mellon University, Pittsburg (1976), 188.Google Scholar
- 3.J. Larsen-Basse, Abrasive Wear Resistance of Tungsten Carbide Composites with Iron-Nickel Binder, in: “Wear of Materials,” S.K. Rhee, A.W. Ruff and K.C. Ludema, eds., ASME, New York (1981), 534.Google Scholar
- 4.N.M. Devnani, Contact Fatigue in Wear of WC-Co and WC-FeNi Alloys, M.S. Thesis, University of Hawaii at Manoa (1979).Google Scholar
- 5.G.K. Nathan and W.J.D. Jones, Influence of Hardness of Abrasives on the Abrasive Wear of Metals, in: “Lubrication and Wear, Fifth Convention, Proc. Inst. Engrs.,” 181:215 (1966-67).Google Scholar
- 6.J. Larsen-Basse, Some Mechanisms of Abrasive Wear of Cemented Carbide Composites, Metaux, Corrosion-Industrie, 653:8 (1980).Google Scholar
- 7.J. Larsen-Basse and B. Premaratne, Abrasive Wear Mechanisms — Effect of Relative Hardness, 2nd Asian-Pacific Corrosion Control Conference, Kuala Lumpur, Malaysia (1981).Google Scholar
- 9.J. Larsen-Basse, C.M. Shishido and L.K. Salem, Abrasion of Some Cemented Carbides by SiC Papers, in: “Proc. 1976 Int. Conf. on Hard Material Tool Technology,” R. Komanduri, ed., Carnegie-Mellon University, Pittsburgh (1976), 231.Google Scholar
- 10.J. Larsen-Basse, Abrasion Mechanisms — Delamination to Machining, in: “Fundamentals of Tribology,” N.P. Suh and N. Saka, eds., The MIT Press, Boston (1978), 679.Google Scholar
- 12.H. Fischmeister and H.E. Exner, Gefugeabhangigkeit der Eigenschaften von WC-Co Hartlegierungen, Arch. Eisenhwes 37:499 (1966).Google Scholar
- 13.H.Y. Doi, Y. Fujiwara and Y. Oosawa, Mechanical Behavior of WC-Co Composite Alloys, in: “Mechanical Behavior of Materials,” Japan Society of Materials Science, 5:207 (1972).Google Scholar
- 14.A. Hara and T. Ikeda, Behavior in Compression Deformation of WC-Co Cemented Carbide, Trans. Japan Inst. Metals 13:128 (1972).Google Scholar
- 15.R.P. Felgar and J.O. Lubahn, Mechanical Behavior of Cemented Carbides, Proc. ASTM, 57:770 (1957).Google Scholar