Advanced

Characterization of a 14Cr ODS steel by means of small punch and uniaxial testing with regard to creep and fatigue at elevated temperatures

Bruchhausen, Matthias; Turba, Krystof LU ; de Haan, Fredericus; Hähner, Peter; Austin, Timothy and de Carlan, Yann (2014) In Journal of Nuclear Materials 444(1-3). p.283-291
Abstract
A 14Cr ODS steel was characterized at elevated temperatures with regard to its behavior in small punch and uniaxial creep tests and in low cycle fatigue tests. A comparison of small punch and uniaxial creep tests at 650°C revealed a strong anisotropy of the material when strained parallel and perpendicular to the extrusion direction with rupture times being several orders of magnitude lower for the perpendicular direction. The stress-rupture and Larson–Miller plots show a very large scatter of the creep data. This scatter is strongly reduced when rupture time is plotted against minimum deflection rate or minimum creep rate (Monkman–Grant plot). Fatigue tests have been carried out at 650°C and 750°C. The alloy is cyclically very stable with... (More)
A 14Cr ODS steel was characterized at elevated temperatures with regard to its behavior in small punch and uniaxial creep tests and in low cycle fatigue tests. A comparison of small punch and uniaxial creep tests at 650°C revealed a strong anisotropy of the material when strained parallel and perpendicular to the extrusion direction with rupture times being several orders of magnitude lower for the perpendicular direction. The stress-rupture and Larson–Miller plots show a very large scatter of the creep data. This scatter is strongly reduced when rupture time is plotted against minimum deflection rate or minimum creep rate (Monkman–Grant plot). Fatigue tests have been carried out at 650°C and 750°C. The alloy is cyclically very stable with practically no hardening/softening. Results from the tests at both temperatures can be described by a common power law. An increase in the test temperature has little influence on the fatigue ductility exponent. For a given total strain level, the fatigue life of the alloy is reduced with increasing temperature. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
small punch, fatigue, anisotropy, ODS steel, creep
in
Journal of Nuclear Materials
volume
444
issue
1-3
pages
283 - 291
publisher
Elsevier
external identifiers
  • wos:000329888100037
  • scopus:84886992876
ISSN
0022-3115
DOI
10.1016/j.jnucmat.2013.09.059
language
English
LU publication?
yes
id
f14bfbb7-2293-4ce3-b08c-563ee6a1e600 (old id 4228402)
date added to LUP
2014-01-08 09:10:08
date last changed
2017-11-19 03:23:24
@article{f14bfbb7-2293-4ce3-b08c-563ee6a1e600,
  abstract     = {A 14Cr ODS steel was characterized at elevated temperatures with regard to its behavior in small punch and uniaxial creep tests and in low cycle fatigue tests. A comparison of small punch and uniaxial creep tests at 650°C revealed a strong anisotropy of the material when strained parallel and perpendicular to the extrusion direction with rupture times being several orders of magnitude lower for the perpendicular direction. The stress-rupture and Larson–Miller plots show a very large scatter of the creep data. This scatter is strongly reduced when rupture time is plotted against minimum deflection rate or minimum creep rate (Monkman–Grant plot). Fatigue tests have been carried out at 650°C and 750°C. The alloy is cyclically very stable with practically no hardening/softening. Results from the tests at both temperatures can be described by a common power law. An increase in the test temperature has little influence on the fatigue ductility exponent. For a given total strain level, the fatigue life of the alloy is reduced with increasing temperature.},
  author       = {Bruchhausen, Matthias and Turba, Krystof and de Haan, Fredericus and Hähner, Peter and Austin, Timothy and de Carlan, Yann},
  issn         = {0022-3115},
  keyword      = {small punch,fatigue,anisotropy,ODS steel,creep},
  language     = {eng},
  number       = {1-3},
  pages        = {283--291},
  publisher    = {Elsevier},
  series       = {Journal of Nuclear Materials},
  title        = {Characterization of a 14Cr ODS steel by means of small punch and uniaxial testing with regard to creep and fatigue at elevated temperatures},
  url          = {http://dx.doi.org/10.1016/j.jnucmat.2013.09.059},
  volume       = {444},
  year         = {2014},
}