Creep deformation characterization of heat resistant steels by stress change test

Hiroyuki Hayakawa, Satoshi Nakashima, Yoshihiro Yakabe, Junichi Kusumoto, Akihiro Kanaya, Hideharu Nakashima

研究成果: ジャーナルへの寄稿学術誌査読

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 steels 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. Microstructures of crept specimens were observed by TEM to discuss the validation of these results.

本文言語英語
ページ(範囲)128-135
ページ数8
ジャーナルZairyo/Journal of the Society of Materials Science, Japan
58
2
DOI
出版ステータス出版済み - 2月 2009

!!!All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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