WC-Co超硬合金のクリ-プ破壊強度に及ぼすWC粒度および結合相粒度の影響

概要

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Bending creep-rupture strength of WC-(6-20)%Co high carbon alloys was investigated at 700-900°C for the rupture time up to 2 hr in relation to the carbide grain size (1.3-3.8 μm) and domain size of binder phase (60-500 gm).<BR>The results obtained were as follows; (1) As the test temperature increased, the creep-rupture strength of each alloy having a given domain size tended to show a maximum with increasing carbide grain size. On the other hand, the strength of the alloys having a given carbide grain size increased with increasing domain size. (2) In each alloy, it was generally observed that microcracks were first formed at WC/WC interfaces and then connected each other to yield a main stable crack. The growth rate of main stable crack, therefore, appeared to correlate with the formation rate of microcracks. (3) The high temperature creeprupture strength of WC-Co cemented carbides would be controlled by the WC/WC interfaces.
社団法人粉体粉末冶金協会の論文