Tensile and Fatigue Properties of Austenitic Stainless Steels at LNG Temperature

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  • LNG温度域におけるオーステナイト系ステンレス鋼の引張特性と疲労特性
  • LNG オンドイキ ニ オケル オーステナイトケイ ステンレス コウ ノ ヒッ

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Description

Tensile strength, fatigue strength and fatigue crack growth rate of metastable and stable austenitic stainless steels at the temperatures between 20°C and ·162°C have been studied. Microstructural changes of specimens during tensile and fatigue deformation were also observed. The results obtained are as follows.<BR>1) The proof stress of metastable steels slightly drops at low temperatures below about -100°C. This is due to the inducement of ε-martensite by tensile stress. Addition of nitrogen makes austenite matrix stable and rises proof stress.<BR>2) The fatigue strength increases with the increase in tensile strength which is raised by the inducement of α′-martensite in metastable steels and by the solid solution strengthening of matrix due to the addition of nitrogen in stable ones.<BR>3) Microstructural changes of tensile and fatigue deformation are characterized by α′-phase formation in metastable steel and by planar arrays of dislocation pile-ups in nitrogen added stable steel at-162°C.<BR>4) At-162°C, fatigue crack growth rate in high ΔK region is larger in metastable steels than in stable ones. This will be attributed to the formation of α′-phase at the tip of crack. In low ΔK region, stable steels exhibit large crack growth rate and this is due to a rapid propagation of fatigue crack along the slip line.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 65 (12), 1756-1765, 1979

    The Iron and Steel Institute of Japan

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