鉄合金の焼結に及ぼす相変態の影響

概要

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The influence of alpha-gamma transformation on the sintering behaviour of powder compacts and wire couples of pure iron, Fe-Ni alloys (1-21 wt% Ni) and Fe-Co alloy (5 wt% Co), which were sintered in cyclic fashion over the temperature range containing alpha-gamma transformation temperature or not, was studied. Results obtained are summarized as follows.<BR>(1) In the cyclic sintering of pure iron, sintering rate of the powder compact was suppressed by alpha-gamma transformation, but sintering of wire couples was impossible due to the transformation strain.<BR>(2) In the cyclic sintering of Fe-Ni and Fe-Co alloys, the sintering rate was markedly promoted by alpha-gamma transformation due to the superplasticity caused by phase transformation.<BR>(3) The difference in the sintering behaviours between pure iron and other ferrous alloys originated from the difference of extent of transformation stress and creep resistance of the materials.
社団法人粉体粉末冶金協会の論文