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Title: コイルばねクリープ試験法により評価した高Crフェライト系耐熱鋼の低応力クリープ変形
Other Titles: Low Stress Creep Deformation in High Chromium Ferritic Heat-resistant Steel Evaluated by Helicoid Spring Creep Test Method
Authors: 山﨑, 重人1 Browse this author
光原, 昌寿2 Browse this author
池田, 賢一3 Browse this author →KAKEN DB
波多, 聰4 Browse this author
中島, 英治5 Browse this author
Authors(alt): Yamasaki, Shigeto1
Mitsuhara, Masatoshi2
Ikeda, Ken-ichi3
Hata, Satoshi4
nakashima, Hideharu5
Keywords: creep deformation
ferritic heat-resistant steel
helicoid spring creep test
creep deformation mechanism
viscoelastic deformation
Issue Date: May-2014
Publisher: 日本鉄鋼協会
Journal Title: 鉄と鋼
Volume: 100
Issue: 5
Start Page: 688
End Page: 695
Publisher DOI: 10.2355/tetsutohagane.100.688
Abstract: We measured a creep deformation in Grade T91 steel under low stress condition using a helicoid spring creep test method. By applying this method, we measured a very low strain rate creep deformation in a short time as there is no need to consider the contribution of the microstructural change to the creep deformation behavior. We distinguished magnitude of several types of time-dependent deformation, including viscoelastic deformation, which occurs during the creep test in order to evaluate a time-dependent plastic deformation in strain-time curves. This consideration derives a conclusion that the time-dependent plastic deformation occurs even in a short time and low stress condition. Moreover, we confirmed a strain rate of whole creep deformation is controlled by the strain rate of the time-dependent plastic deformation at the time of 270 ks in the creep test. We confirmed that though there are almost no changes in the microstructure of Grade T91 steel during creep tests, the susceptibility on strain rate to applied stress has changed depending on the applied stress region. In addition, activation energy of the creep deformation was also different in each stress region. From these results, we concluded that the dominant creep deformation mechanism is different in the low stress region and high stress region.
Rights: 著作権は日本鉄鋼協会にある
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 池田 賢一

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