ボイラ及び圧力容器用2.25Cr-1Mo鋼の高温疲労寿命に及ぼすヒート,熱処理,ひずみ制御モードの影響

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  • Influence of Heats, Heat-treatments and Strain Control Mode on High Temperature Fatigue Lives of 2.25Cr-1Mo Steels for Boiler and Pressure Vessels
  • ボイラ オヨビ アツリョク ヨウキヨウ 2 25Cr 1Mo コウ ノ コウオン ヒロウ ジュミョウ ニ オヨボス ヒート ネツ ショリ ヒズミ セイギョ モード ノ エイキョウ

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High temperature fatigue tests were conducted for normalized and tempered 2.25Cr-1Mo steels of three heats. As compared with the reference data, the influence of heats, heat-treatments and testing conditions such as testing temperature, strain rate and strain control mode on the high temperature fatigue lives were investigated. The results obtained are as follows.<BR>1) Heats of the normalized and tempered 2.25Cr-1Mo steels scarcely affected the fatigue lives at high temperatures.<BR>2) Between annealed and normalized and tempered 2.25Cr-1Mo steels there was scarcely difference in the fatigue lives.<BR>3) Strain rate between 10-3 and 10-2/s scarcely affected the high temperature fatigue lives of 2.25Cr-1Mo steel.<BR>4) Strain control mode and testing temperature affected the fatigue lives. In this case the strain control modes are axial and diametral.<BR>5) From these results, the ASME fatigue design curves of 2.25Cr-1Mo steel for nuclear components were unconservative for the data tested under axial strain control at each temperature. Modified design curves were proposed for normalized and tempered 2.25Cr-1Mo steels.

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  • 鉄と鋼

    鉄と鋼 90 (10), 841-845, 2004

    一般社団法人 日本鉄鋼協会

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