Creep under Rapid Cyclic Heating and Cooling

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  • 急激繰返加熱および冷却下のクリープ
  • キュウゲキ クリカエシ カネツ オヨビ レイキャク カ ノ クリープ

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In the previous studies made by the present authors, it was found that the creep curve of low carbon steel and ferritic as well as austenitic stainless steel in the test with temperature variation under a fixed applied stress can be predicted from the results of constant temperature tests of the respective materials. In those tests temperature cycle was comparatively slow. However, for practical purposes, studies of creep behaviours under rapid temperature cycling are important. In this report, by using an apparatus for rapid cyclic heating and cooling, the creep behaviours under rapid temperature cycling are investigated by experiments, and we are trying to make predictions as to creep curve from the data of constant temperature creep tests. The followings are the conclusions from our studies:<br>(1) The apparatus for rapid cyclic heating and cooling gave a good pattern of temperature cycling for the creep test under rapid temperature cycling.<br>(2) The uneven distribution of temperature along the gauge length of specimen was inevitable and so the mean temperature T* was defined as the temperature at which the gauge length of uneven temperature distribution elongates in the same amount with the case of uniform temperature distribution.<br>(3) The creep curve for rapid cyclic heating and cooling could be predicted from the data of creep test in primary stage made at constant mean temperature, by introducing “Equivalent steady mean temperature” Te*. The predicted curves were fairly close to the experimental ones as to low carbon steels and austenitic stainless steels.<br>(4) With regard to the creep damage of the materials caused by being exposed to rapid cyclic heating and cooling, the crept specimens were subjected to tension test at room temperatures and also microscopic observations was made on the structure, in which no noticeable change was found.

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