Low stress creep deformation in high chromium ferritic heat-resistant steel evaluated by helicoid spring creep test method

Research output: Contribution to journalArticle

1 Citation (Scopus)

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 confrmed 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 confrmed 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.

Original languageEnglish
Pages (from-to)688-695
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume100
Issue number5
DOIs
Publication statusPublished - 2014

Fingerprint

creep tests
Steel
Chromium
chromium
Creep
steels
heat
strain rate
Strain rate
plastic deformation
Plastic deformation
grade
Hot Temperature
activation energy
magnetic permeability
Activation energy
microstructure
curves

All Science Journal Classification (ASJC) codes

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

Cite this

@article{252c8d4f80474a1a81371b816a1fd333,
title = "Low stress creep deformation in high chromium ferritic heat-resistant steel evaluated by helicoid spring creep test method",
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 confrmed 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 confrmed 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.",
author = "Shigeto Yamasaki and Masatoshi Mitsuhara and Ikeda, {Ken Ichi} and Satoshi Hata and Hideharu Nakashima",
year = "2014",
doi = "10.2355/tetsutohagane.100.688",
language = "English",
volume = "100",
pages = "688--695",
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 = "5",

}

TY - JOUR

T1 - Low stress creep deformation in high chromium ferritic heat-resistant steel evaluated by helicoid spring creep test method

AU - Yamasaki, Shigeto

AU - Mitsuhara, Masatoshi

AU - Ikeda, Ken Ichi

AU - Hata, Satoshi

AU - Nakashima, Hideharu

PY - 2014

Y1 - 2014

N2 - 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 confrmed 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 confrmed 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.

AB - 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 confrmed 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 confrmed 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.

UR - http://www.scopus.com/inward/record.url?scp=84899862418&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84899862418&partnerID=8YFLogxK

U2 - 10.2355/tetsutohagane.100.688

DO - 10.2355/tetsutohagane.100.688

M3 - Article

AN - SCOPUS:84899862418

VL - 100

SP - 688

EP - 695

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 - 5

ER -