温度変動下の加速クリープおよびクリープ破断

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  • Accelerated Stage Creep and Creep Rupture under Temperature Cycling
  • オンド ヘンドウ カ ノ カソク クリープ オヨビ クリープハダン

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In the present paper, the influence of temperature cycling on accelerated stage creep and the rupture life is discussed by employing AISI 318 type stainless steel. In this discussion, the comparison of both strengths in temperature cycling and steady temperature is made by taking the equivalent steady temperature for rupture life of temperature cycling test same as the test temperature of constant temperature test. From the creep rupture tests under saw-type cycling of temperature the following are concluded : (1) Embrittlement of crept material subjected to temperature cycling is significantly larger than the case of steady temperature. The rupture life under such temperature cycling is nearly twice as much as that under steady temperature and the elongation is approximately half of that under constant temperature. It would probably be because of a difference in metallographic structure change occurred during tertiary stage of creep, for both series of tests. (2) In the case of transient and steady stages of creep, the influence of temperature cycling is negligibly small. It would probably be due to the absence of difference in structure change during such stages of creep for both temperature cycling test and steady temperature test.

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