引張加工したCr-Niステンレス鋼の低温時効による収縮現象

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タイトル別名
  • The Contraction in Plastically Elongated Cr-Ni Austenitic Stainless Steel After the Aging at Low Temperature
  • ヒッパリ カコウ シタ Cr-Ni ステンレス コウ ノ テイオン ジコウ ニ ヨル シュウシュク ゲンショウ

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抄録

When plastically deformed austenitic Cr-Ni stainless steels were heated isothermally at about 130°C for a long time, the shortening effect in steels occasionally appeared. Two commercial steels, 18-9 and 18-12, were prepared to study the cause of this phenomenon, and elongated 0∼20% at both room temperature and liquid nitrogen temperature after solution treatment. Then the thermal dilatation characteristics up to 1000°C and the aging characteristics at 100°∼175°C were studied.<BR>Both steels, elongated at room temperature, were all nonmagnetic, showing no contraction in the thermal dilatation curves. On the other hand, both steels elongated at subzero temperature were all magnetic and contracted clearly. The largest contraction were observed in the about 5% elongated specimen of a subzero worked 18-9 alloy and the about 10% elongated specimen of a 18-12 alloy. The contraction decreased in both cases where the elongation of steels decreased and increased. The steels elongated considerably at room temperature showed a maximum contraction of about 0.05% after a short time aging at 125°C, but the contraction diminished gradually after a long time aging. On the contrary, the steels elongated at subzero temperature, showed generally a clear contraction which attained 0.1% in maximum and the contraction remained even after a long time aging. The working ratio and temperature at which the largest contraction appeared, varied by the stability of austenite in steels. The elongated steels in which about 10% martensite and austenite coexisted showed the largest contraction after the aging at a low temperature.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 28 (10), 598-603, 1964

    公益社団法人 日本金属学会

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