On the Creep-Rupture Strength of Notched Specimens of 18-8 Austenitic Stainless Steel

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  • 18-8系ステンレス鋼の切欠クリープ破断強度について
  • 18-8ケイ ステンレス コウ ノ キリカケ クリープハダンキョウド ニ ツイテ

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The creep rupture behavior of 18-8 austenitic stainless steel was tested at 600-700°C, using notched and plain specimens, and the changes of microstructure during the creep test were also investigated.<br>The results obtained are as follows:<br>1) Creep rupture strength at 600°C of 18-8 stainless steel is little affected either by the presence of notch or by the type of notch. Notched specimens grow in strength more and more than plain ones with elevation of temperature between 600-700°C, and the strengthening rate is increased by notch.<br>2) The observation of microstructure after the creep rupture test shows that the slip bands are hardly visible. This proves there are some striking differences between the creep and the fatigue behavior at high temperatures.<br>3) An investigation of crack initiation and propagation at 650°C in notched specimen shows that the crack during creeping appears at the grainboundary below the notchroot and is propagated toward the notchroot and the center of specimen. The crack behavior and the changes of notchwidth show the same tendency in their developments.<br>4) The creep rupture elongation of plain specimen of 18-8 stainless steel differed greatly in character according to testing temperature and rupture time. Therefore the creep rupture elongation and the change of microstructure may have a close affinity with each other.

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