Effect of Pre-ageing on the Isothermal Ageing of Fe-N Alloy

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  • Fe-N合金の等温時効におよぼす予備時効の影響
  • Fe-N ゴウキン ノ トウオン ジコウ ニ オヨボス ヨビ ジコウ ノ エイキョウ

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The effect of pre-ageing at 18°C on the subsequent isothermal ageing at 100°C was studied in a Fe-0.028 wt%N alloy by means of internal friction technique and transmission electron microscopy. It was observed that very fine particles were nucleated during pre-ageing at 18°C and the nucleation of these particles was completed after 100 hours at 18°C. These particles grow in size more or less by the subsequent ageing at 18°C or at 100°C. It was found that when these particles began to grow at 18°C or 100°C, there was a sudden decrease in the internal friction of the aged specimen. This may be caused by the decrease in the concentration of nitrogen remaining in the solid solution. From the data of internal friction measurements, the activation energy for the nucleation of the particle was estimated to be about 15000 cal/mol, which agreed well with the value for the diffusion of Nitrogen in α-Fe.

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