低炭素・中窒素型316鋼のクリープ破断特性に及ぼすC量とCr偏析の影響

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タイトル別名
  • Effects of Carbon Content and Chromium Segregation on Creep Rupture Properties of Low Carbon and Medium Nitrogen Type 316 Stainless Steel
  • テイ タンソ チュウ チッソガタ 316 コウ ノ クリープ ハダン トクセイ

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抄録

The creep rupture properties of type 316 stainless steels containing 0.0050.022%C and 0.07%N have been investigated at 550°C and 600°C from the aspect of the grain boundary carbide precipitation which was changed with carbon content and chromium segregation. A small amount of carbide precipitated on grain boundaries during creep, because the solibility limit of the carbide is less than 0.005%. The creep rupture ductility of this steel increased with the reduction of carbon content from 0.010% to 0.005% while it decreased with increasing carbon content from 0.010% to 0.020%. Since the amount of grain boundary carbide decreased with reducing carbon content, the increase in ductility was due to the suppression of grain boundary embrittlement caused by the carbide. The creep rupture ductility of this steel was also improved by reducing chromium segregation. This behavior was attributed to the change in carbide morphology from concentrated type to dispersed one, which reduced the grain boundary embrittlement.

収録刊行物

  • 鉄と鋼

    鉄と鋼 83 (5), 317-322, 1997

    一般社団法人 日本鉄鋼協会

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