Fe-Ni-C 3元系混合圧粉体の焼結特性

概要

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Using mixed powder compacts of Fe-Ni-1.0 wt%C system with different Ni contents and Fe-4.0wt%Ni-C system with different graphite contents, the influence of Ni addition on the carburization and the dimensional changes were investigated by means of the differential dilatometric method and carbon analysis.<BR>The results obtained are summarised as follows:<BR>(1) Carbon content combined during heating process up to 900°C, which is about 0.1 wt% in a Fe-1.0 wt%C binary compact, increases with increasing Ni content in Fe-Ni-1.0 wt%C ternary compacts.<BR>(2) In the case of the ternary compacts which content carbonyl Ni powder, the sintering rate is remarkably promoted. Also the sintering promotive effect is observed in Fe-carbonyl Ni-1.0 wt%C compacts. These results suggest that the shrinkage due to the sintering of fine powders plays an important role in the promotion of sintering.<BR>(3) The combined carbon concentration of the Fe-1.0 wt%C binary sintered compact is nearly the same as that of eutectoid composition. However in Fe-Ni-1.0 wt%C ternary sintered compacts, some hypereutectoid regions are observed, because the carbon concentration lowers with increasing Ni content along the Fe-Ni-C ternary eutectoid line. Therefore the retained shrinkage increase remarkably by the contraction due to the precipitation of primary cementite in the Ni content more than 6 wt%Ni.
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