Creep deformation characterization of heat resistant steel by stress change test

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

研究成果: Contribution to journalArticle査読

9 被引用数 (Scopus)

抄録

To evaluate the creep deformation mechanism of heat resistant steel, stress change tests were conducted during creep tests for Modified 9Cr-1Mo Steel and 2.25Cr-1Mo Steel. In this study it was confirmed that the dislocation behavior during the creep tests was in viscous manner because of no instantaneous plastic strain observed at stress increments. Transient backward creep behavior was observed after stress reduction for these steels in this work. Mobilities of dislocation were evaluated by observed backward creep behavior after stress reductions. Internal stresses were evaluated by the changes of creep rate in stress increments. And mobile dislocation densities were evaluated with the estimated mobilities of dislocation and the changes of creep rate in stress increments. It was found that the variation of evaluated mobile dislocation densities 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 these steels in this work. The mobilities of dislocation showed a good correlation with 1/T and related with solute amount of Mo that is a solution hardening element.

本文言語英語
ページ(範囲)556-562
ページ数7
ジャーナルInternational Journal of Pressure Vessels and Piping
86
9
DOI
出版ステータス出版済み - 9 2009

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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