Evaluation of creep deformation mechanism of heat resistant steel by stress change test

Hiroyuki Hayakawa, Satoshi Nakashima, Junichi Kusumoto, Daisuke Terada, Fuyuki Yoshida, Hideharu Nakashima

研究成果: 書籍/レポート タイプへの寄稿会議への寄与

抄録

In order to evaluate creep deformation mechanism of heat resistant steels, stress change tests were conducted during creep tests. In this study, it was confirmed that the dislocation behavior during the creep tests was in viscous manner, because no instantaneous plastic strain was observed at stress increments. Transient behavior was observed after stress changes for all kinds of steel in this work. Mobility of dislocation was evaluated by the observed backward creep behavior after stress reduction. Internal stress was evaluated by the change of creep rate in stress increment, and mobile dislocation density was evaluated with the estimated mobility of dislocation and the change of creep rate in stress increment. It was found that the variation of mobile dislocation density during creep deformation showed the same tendency as the variation of creep rate. Therefore mobile dislocation density is the dominant factor that influences the creep rate variation in creep deformation of heat resistant steels investigated in this work. The mobility of dislocation showed a good correlation with 1/T and it is related with the amount of solute Mo that is a solution strengthening element. Microstructure of crept specimens was observed by TEM to discuss the validation of these results.

本文言語英語
ホスト出版物のタイトル2007 Proceedings of the ASME Pressure Vessels and Piping Conference - 8th International Conference on Creep and Fatigue at Elevated Temperatures - CREEP8
ページ533-542
ページ数10
DOI
出版ステータス出版済み - 2008
イベント2007 ASME Pressure Vessels and Piping Conference - 8th International Conference on Creep and Fatigue at Elevated Temperatures, PVP-2007/CREEP8 - San Antonio, TX, 米国
継続期間: 7月 22 20077月 26 2007

出版物シリーズ

名前2007 Proceedings of the ASME Pressure Vessels and Piping Conference - 8th International Conference on Creep and Fatigue at Elevated Temperatures - CREEP8

その他

その他2007 ASME Pressure Vessels and Piping Conference - 8th International Conference on Creep and Fatigue at Elevated Temperatures, PVP-2007/CREEP8
国/地域米国
CitySan Antonio, TX
Period7/22/077/26/07

!!!All Science Journal Classification (ASJC) codes

  • 機械工学

フィンガープリント

「Evaluation of creep deformation mechanism of heat resistant steel by stress change test」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル