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Hardmetals With Alternative Fe/co/ni and Fe/ni Binders – A Study on Mo Doping, Mechanical Properties and Creep Behaviour

  • : C. Buchegger 1, R. Koos 1, W. Lengauer 1, K. Rödiger 2, H. van den Berg 2
  • : 1 Vienna University of Technology, 2 Kennametal Shared Services GmbH
  • : 2013, Vol 1, p. 107-116
  • : PDF Download
  • : 2013


Properties of hardmetals with a Fe/Co/Ni = 40/20/40 wt.% binder alloy were measured. Green bodies were prepared on a usual powder metallurgical route and sintered under vacuum conditions. The sintering behaviour of hardmetals in dependency on the binder content, and Mo-addition from various sources such as molybdenum nitride, molybdenum carbide and alloyed molybdenum was investigated by dilatometry. Microstructure analysis shows an improved grain-growth inhibiting effect of ?-MoN1-x as compared to both Mo2C and alloyed Mo. Hardness HV30, fracture toughness K1C, magnetic saturation and coercive force were determined as a function of the carbon content. The influence of WC grain-size on the creep behaviour was compared to cobalt containing and a cobalt-free Fe/Ni = 15/85 wt.% binder alloy by a three-point bending test under power-law conditions. From experimental data creep parameters such as Norton exponents (n = 3.7 – 8.7) and activation energies (Q = 313 – 318 kJ/mol) were estimated.


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