Strainrange Partitioning Analysis for Creep-Fatigue Lives of Heat-Resisting Materials

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  • 各種耐熱鋼のクリープ疲労寿命に対するひずみ範囲分割法による解析
  • カクシュ タイネツ コウ ノ クリープ ヒロウ ジュミョウ ニ タイスル ヒズミ ハンイ ブンカツホウ ニ ヨル カイセキ

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Abstract

Creep-fatigue interaction of several ferritic steels such as Mod. 9Cr-1Mo, 9∼12Cr-2W, newly produced Pd-added 9Cr steels, extremely high strength oxide dispersion strengthened (ODS) ferritic steels and a precipitation hardened carbon-free martensitic steel, were investigated. From these results it was clarified that the points to improve the creep-fatigue life are to keep the high creep rupture ductility or to decrease the plastic strain of cyclic deformation by making steel creep rupture strength extremely high. From the viewpoint of an evaluation of the creep-fatigue life, the analysis by ductility normalized-strainrange partitioning method explains well the effect of creep ductility and strength of the materials on the creep-fatigue life.

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