Fracture Toughness as an Aid to Alloy Development

  • Tom McLaren
  • John B. Lambert


With the portent of raw material shortages for the manufacture of conventional WC-Co cutting tool materials, a study to develop new materials for the hard metal industry was undertaken. Fracture toughness testing, employing short-rod fracture toughness samples on a Fractometer*, was a valuable tool for alloy screening. In this study four material matrices were examined:
  1. (1)

    WC-Co alloys

  2. (2)

    Steel-cutting cemented carbides

  3. (3)

    (Ti, Mo) C-Ni compositions

  4. (4)

    Composite Al2O3-TiC ceramics

Compositional and microstructural variations were introduced to find, first, the effect on mechanical properties, including fracture toughness, and, second, the effect on application and tool performance. Although fracture toughness helped rank material candidates within a system as to relative impact resistance, tool life is dependent also on other factors, such as hardness and oxidation resistance.


Fracture Toughness Flank Wear Cobalt Content Hard Metal Cement Carbide 


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Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • Tom McLaren
    • 1
  • John B. Lambert
    • 2
  1. 1.VR/Wesson DivisionFansteel Inc.WaukeganUSA
  2. 2.Fansteel Inc.North ChicagoUSA

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