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Influence of Probe Test Orientation, Sintering Degree and Morphological Anisotropy of Porosity on the Young’s Modulus of Homogeneous Sintered Steel

  • : Gian Filippo Bocchini 1, Roberto Montanari 2, Alessandra Varone 2
  • : 1 Powder metallurgy consultant, 2 University of Rome
  • : 2013, Vol 2, p. 121-126
  • : PDF Download
  • : 2013

Abstract

Literature data on Young’s modulus of sintered steels are discordant. MPIF Standards don’t allow canceling uncertainties. It seems quite sure that E is a grooving function of material’s density and sintering, defined, e.g., by a Larson-Miller parameter. Differences have been observed between Young moduli for very small or sensible deformations. An experimental study has been made to reveal possible differences attributable to the angle between compaction axis and main axis of test probes, obtained by WEM, from cylindrical blanks of Fe-Mo-C alloy, sintered at 3 different temperature and time. The resonant frequency method has been applied.

The analysis of the results shows that E increases versus sintering intensity, at least up to a certain “threshold”, depending on probe orientation. Pore morphology and crystal texture don’t explain the observed dif-ferences.

A model of porosity shape, orientation, and relative elongation has been proposed. The developments based on the model imply some differences of elastic behavior, depending on the direction of stressing axis.

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