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Rheological characterization of feedstock based on chromium carbide reinforced high speed steel to be used in MIM

  • : Ana Romero1, Gemma Herranz1, Barbara Bellon1
  • : 1Universidad de Castilla La Mancha
  • : PDF Download
  • : 2015


A practical rheological study has been performed to evaluate the influence of addition of chromium carbide on the rheological behaviour of the feedstock of AISI M2 high speed steel . Due to the highly individual characteristics of MIM’s feedstock, the study was focused on the feedstock’s formulation. Metal powder is mixed with the amount of reinforcement required and the chosen binder system. The metal powder has been partially substituted with different amounts of Cr3C2 powder (up to 10 wt.%), keeping a constant powder loading of 68%in volume. The rheological properties of the prepared MIM feedstocks including flow behaviour index, activation energy and moldability index have been determined using a capillary rheometer. The results show that MIM feedstocks depends highly on the composition of the mixture. The feedstock based on unreinforced steel exhibits a higher viscosity over reinforced feedstock at any shear rate due to the better packing ability of the latter All feedstocks demonstrated a good pseudo-plastic behaviour,therefore, they are all suitable to be used in injection moulding.


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