低炭素2 1/4 Cr-1Mo鋼溶着金属のフェライト粗粒化におよぼすクリープ歪みの影響

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タイトル別名
  • Effect of Creep Strain on Coarsening of Ferrite Grains in the Welding Deposit of Low C-2 1/4 Cr-1Mo Steel
  • テイタンソ 21 4Cr-1Mo コウ ヨウチャク キンゾク ノ フェライトソリュウカ ニ オヨボス クリープ ヒズミ ノ エイキョウ

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抄録

In low carbon -2 1/4 Cr-1Mo multilayer welded deposit for joining main steam pipes, ferrite grains are sometimes coarsened during stress relief annealing process after welding. Although the pipe-metal temperature in operation is far lower than the annealing temperature of them, the coarsening of ferrite grains may be accelerated due to the creep strain on internal pressure.<BR>In order to clarify the effect of creep strain on the coarsening of ferrite grains, conditions of coarsening in the deposit during heating tests or creep tests at 700°C and 740°C were investigated. As the results, the following items have been proved: (1) The higher the heating temperature is, the larger the ferrite coasening rate becomes. (2) The coarsening rate is not affected by the strain rate 10−7/hr, so far as the amount of coarsened ferrite does not exceed about 35% of the whole volume of deposit, but it is affected when coarsened ferrite exists beyond that amount. As the reason of the fact, it is assumes that the coarsening associated with recrystallization takes place at latter stage of the coarsening. (3) The coarsening rate is markedly diminished under the larger creep rate of 10−4/hr, because the larger strain destroys casting structure of the welded deposit. (4) The tangential strain rate of a pipe in operation due to the internal pressure is limited to the smaller value than 10−7/hr, and the time when the amount of coarsened ferrite reaches 35% under the strain rate of 10−7/hr at the operating temperature 568°C is estimated as a hundred years or more.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 27 (11), 542-547, 1963

    公益社団法人 日本金属学会

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