応力時効した軟鋼の電子顕微鏡組織について

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  • Observation of Electron-microscopic Structures of Stress-aged Mild Steel
  • オウリョク ジコウ シタ ナンコウ ノ デンシ ケンビキョウ ソシキ ニ ツイテ

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The electron-microscopic structure of mild steel stress-aged (strain-aged under definite mechanical stresses) at various conditions was examined. The change of structure caused by strain-aging, at 100°C and 200°C for predetermined length of time, was also examined for mild steel which had been stress-aged at various conditions. It was confirmed by electron-microscopic study that the strain aging of mild steel is accelerated without doubt by mechanical stresses imposed on the specimen during the strain-aging so that much more solute atoms in ferrite will be consumed during the stress-aging to produce a great number of fine precipitates. The stress-aged specimens did not show any significant structural change even when they were strain-aged. This means that, after the stress-aging, there is not so many solute atoms in ferrite as may contribute to strain-aging of mild steel. It may be possible to obtain a non-ageable mild steel by utilizing the stress-aging.

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