Fatigue Properties of Weldments in Various Steels at Low Temperature

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  • 低温における溶接部疲労特性の鋼種による差異
  • テイオン ニ オケル ヨウセツブ ヒロウ トクセイ ノ コウシュ ニヨル サイ

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Abstract

Fatigue properties (fatigue crack propagation behaviour, fatigue fracture toughness etc.) of weldments and the base metal in 5.5%Ni steel developed for low-temperature use were studied in the temperature range from 98 K to room temperature. The results obtained were compared with those in 780 MPa grade high strength tempered martensitic steel previously reported, and the influence of composition on fatigue properties at low temperature was discussed. Fatigue properties in 5.5%Ni steel weldments at low temperature are remarkably different from those in high strength steel. Fatigue properties at low temperature seem to be more material- and temperature-sensitive than static mechanical ones.

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