WC-Co超硬合金の低温抗折力

概要

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The transverse-rupture strength (am) of conventional WC-(10, 20)%Co alloys was examined in the temperature range from room temperature to -196°C in comparison with WC-(10, 20)%Ni alloys ac-cording to the Japanese Industrial Standard (JIS). The strength was analyzed in relation to the structural defects acting as a fracture source.<BR>In each type of the alloys, the sort, dimension and location of the defects as a fracture source were not changed, but the values of ao and p (ao, strength of the sound alloy around the defect; ρ. usual meaning in brittle fracture) increased and decreased, with decreasing temperature respectively. In WC-Co alloys, however, the temperature dependence of these values was remarkable. For instance, the value of ao was higher at each temperature when the binder content was kept constant. The value of ?? m of each type of alloys changed with test temperatures in the same way as that of σo.
社団法人粉体粉末冶金協会の論文