ＷＣ‐Ｃｏ系超硬合金における焼結残留応力および単軸引張負荷による微視的応力・ひずみの解析

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  • Analyses of sintering residual stress and microscopic stress/strain under uniaxial tension in WC-Co hardmetal.
  • WC Coケイ チョウコウ ゴウキン ニ オケル ショウケツ ザンリュウ オウ

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Analyses have been made on the sintering residual stress and the microscopic stress/strain under uniaxial tension in WC-Co hardmetal with a mechanical model of two-phase sintered materials, as proposed in a previous paper. The cooling process in sintering was simulated by introducing thermal stress into the mechanical model. The results obtained on the sintering residual stress in WC-grain and Co-binder agree well with the experimental values obtained by the X-ray diffraction method given in a reference. The analyses of the microscopic stress/strain in WC-grain and Co-binder were made under two initial conditions ; one with no sintering residual stress and the other with sintering residual stress. The results of the calculation have shown that the sintering residual stress has no influence on the maximum values of microscopic stress in the WC-grain and Co-binder, but it has influence on the plastic deformation in the Co-binder. The variation of the transverse rupture strength of WC-Co hardmetal, as a function of Co volume fraction VCo, is explained based on two kinds of fracture criteria, one of which is effective, depending on the value of VCo ; the transverse rupture strength is controlled by flaw size in the lower VCo region, and by microscopic stress/strain in the higher VCo region.

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