Characterization of creep deformation behavior of 2.25Cr-IMo steel by stress change test

Hiroyuki Hayakawa, Daisuke Terada, Fuyuki Yoshida, Hideharu Nakashima, Akihiro Kanaya, Satoshi Nakashima

Research output: Contribution to journalArticle

Abstract

To characterize the creep deformation mechanism of 2,25Cr-IMo Steel, stress change tests were conducted during creep tests. In this study it was confirmed that the dislocation behavior during the creep tests were in viscous manner, because no instantaneous plastic strain was observed at stress increments and transient backward creep behavior was observed after stress reduction same as Modified 9Cr-IMo Steel. Mobilities of dislocation were evaluated by observed backward creep behavior after stress reductions. Internal stresses were evaluated by the changes of creep strain rate in stress increments. These values were almost stable during creep deformation. Mobile dislocation densities were evaluated with the estimated mobilities of dislocation and the changes of creep strain rate in stress increments. Variation of evaluated mobile dislocation densities with creep strain showed the same tendency as variation of creep strain rate. Therefore mobile dislocation density is the dominant factor that influences the creep strain rate in creep deformation of this steel. The difference of estimated mobility of dislocation between 2.25Cr-1Mo Steel and Modified 9Cr-IMo Steel was considered to be caused by the different amount of solute Mo between these steels.

Original languageEnglish
Pages (from-to)466-471
Number of pages6
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume93
Issue number6
DOIs
Publication statusPublished - Jun 1 2007

Fingerprint

Steel
Creep
steels
strain rate
creep tests
Strain rate
residual stress
solutes
tendencies
plastics
Residual stresses
Plastic deformation

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

Cite this

Characterization of creep deformation behavior of 2.25Cr-IMo steel by stress change test. / Hayakawa, Hiroyuki; Terada, Daisuke; Yoshida, Fuyuki; Nakashima, Hideharu; Kanaya, Akihiro; Nakashima, Satoshi.

In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 93, No. 6, 01.06.2007, p. 466-471.

Research output: Contribution to journalArticle

Hayakawa, Hiroyuki ; Terada, Daisuke ; Yoshida, Fuyuki ; Nakashima, Hideharu ; Kanaya, Akihiro ; Nakashima, Satoshi. / Characterization of creep deformation behavior of 2.25Cr-IMo steel by stress change test. In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan. 2007 ; Vol. 93, No. 6. pp. 466-471.
@article{f66369536a3b4a3e8a6e240e35a813a7,
title = "Characterization of creep deformation behavior of 2.25Cr-IMo steel by stress change test",
abstract = "To characterize the creep deformation mechanism of 2,25Cr-IMo Steel, stress change tests were conducted during creep tests. In this study it was confirmed that the dislocation behavior during the creep tests were in viscous manner, because no instantaneous plastic strain was observed at stress increments and transient backward creep behavior was observed after stress reduction same as Modified 9Cr-IMo Steel. Mobilities of dislocation were evaluated by observed backward creep behavior after stress reductions. Internal stresses were evaluated by the changes of creep strain rate in stress increments. These values were almost stable during creep deformation. Mobile dislocation densities were evaluated with the estimated mobilities of dislocation and the changes of creep strain rate in stress increments. Variation of evaluated mobile dislocation densities with creep strain showed the same tendency as variation of creep strain rate. Therefore mobile dislocation density is the dominant factor that influences the creep strain rate in creep deformation of this steel. The difference of estimated mobility of dislocation between 2.25Cr-1Mo Steel and Modified 9Cr-IMo Steel was considered to be caused by the different amount of solute Mo between these steels.",
author = "Hiroyuki Hayakawa and Daisuke Terada and Fuyuki Yoshida and Hideharu Nakashima and Akihiro Kanaya and Satoshi Nakashima",
year = "2007",
month = "6",
day = "1",
doi = "10.2355/tetsutohagane.93.466",
language = "English",
volume = "93",
pages = "466--471",
journal = "Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan",
issn = "0021-1575",
publisher = "一般社団法人 日本鉄鋼協会",
number = "6",

}

TY - JOUR

T1 - Characterization of creep deformation behavior of 2.25Cr-IMo steel by stress change test

AU - Hayakawa, Hiroyuki

AU - Terada, Daisuke

AU - Yoshida, Fuyuki

AU - Nakashima, Hideharu

AU - Kanaya, Akihiro

AU - Nakashima, Satoshi

PY - 2007/6/1

Y1 - 2007/6/1

N2 - To characterize the creep deformation mechanism of 2,25Cr-IMo Steel, stress change tests were conducted during creep tests. In this study it was confirmed that the dislocation behavior during the creep tests were in viscous manner, because no instantaneous plastic strain was observed at stress increments and transient backward creep behavior was observed after stress reduction same as Modified 9Cr-IMo Steel. Mobilities of dislocation were evaluated by observed backward creep behavior after stress reductions. Internal stresses were evaluated by the changes of creep strain rate in stress increments. These values were almost stable during creep deformation. Mobile dislocation densities were evaluated with the estimated mobilities of dislocation and the changes of creep strain rate in stress increments. Variation of evaluated mobile dislocation densities with creep strain showed the same tendency as variation of creep strain rate. Therefore mobile dislocation density is the dominant factor that influences the creep strain rate in creep deformation of this steel. The difference of estimated mobility of dislocation between 2.25Cr-1Mo Steel and Modified 9Cr-IMo Steel was considered to be caused by the different amount of solute Mo between these steels.

AB - To characterize the creep deformation mechanism of 2,25Cr-IMo Steel, stress change tests were conducted during creep tests. In this study it was confirmed that the dislocation behavior during the creep tests were in viscous manner, because no instantaneous plastic strain was observed at stress increments and transient backward creep behavior was observed after stress reduction same as Modified 9Cr-IMo Steel. Mobilities of dislocation were evaluated by observed backward creep behavior after stress reductions. Internal stresses were evaluated by the changes of creep strain rate in stress increments. These values were almost stable during creep deformation. Mobile dislocation densities were evaluated with the estimated mobilities of dislocation and the changes of creep strain rate in stress increments. Variation of evaluated mobile dislocation densities with creep strain showed the same tendency as variation of creep strain rate. Therefore mobile dislocation density is the dominant factor that influences the creep strain rate in creep deformation of this steel. The difference of estimated mobility of dislocation between 2.25Cr-1Mo Steel and Modified 9Cr-IMo Steel was considered to be caused by the different amount of solute Mo between these steels.

UR - http://www.scopus.com/inward/record.url?scp=34547423881&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34547423881&partnerID=8YFLogxK

U2 - 10.2355/tetsutohagane.93.466

DO - 10.2355/tetsutohagane.93.466

M3 - Article

AN - SCOPUS:34547423881

VL - 93

SP - 466

EP - 471

JO - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

JF - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

SN - 0021-1575

IS - 6

ER -