Ultrasonic attenuation of cemented tungsten carbides under uniaxial compression

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  • 一軸圧縮下における超硬合金の超音波減衰について
  • 1ジク アッシュク カ ニ オケル チョウコウゴウキン ノ チョウオンパ ゲンスイ ニ ツイテ

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Abstract

Changes of ultrasonic attenuation under uniaxial compression have been investigated for WC-Co alloys containing various cobalt contents and grain sizes by means of a conventional ultrasonic apparatus; the measuring frequency was 10 MHz. The attenuation of the alloys plotted against the amount of prestrain began to increase rapidly above some critical strain. This critical strain increased with increasing Co contents and grain sizes of WC. The ratio of the compressive rupture strain (εr) and the critical strain (εc) invariably remained constant, i.e.εr/εc≅4. Microscopic observations showed that the generation of micro-cracks at grain boundaries is responsible for the increase of the attenuation. Under compressive fatigue stresses, the attenuation increased rapidly after a certain number of fatigue cycles prior to the rupture of the alloy.

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