Predicted life of P91 steel for cyclic high temperature service

Rami Pohja (Corresponding Author), Stefan Holmström, Pertti Auerkari, Asta Nurmela

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The P91 steel is widely used in high temperature components of power plants, and it is a candidate material for Gen-IV reactors. The P91 steel has relatively attractive mechanical and physical properties combined with resistance to stress corrosion cracking in water-steam environments. This study aimed to explore the combined cyclic, creep and relaxation behaviour of P91 material. Uniaxial specimens were subjected to cyclic loadings with periodic forward creep or relaxation at peak stress. The results indicate that prior creep or intermediate relaxation periods up to 72 h will influence the subsequent cyclic softening of P91, but do not significantly reduce the cyclic life. In contrast, prior cycling has a detrimental effect on the subsequent creep life. A simplified creep-fatigue model is shown to predict life better than usual code-based approaches. Improved verification of all models would benefit from the availability of more extensive long-term data on P91 steel.
Original languageEnglish
Pages (from-to)301-310
Number of pages10
JournalMaterials at High Temperatures
Volume34
Issue number5-6
Early online date2017
DOIs
Publication statusPublished - 2 Nov 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

Steel
Creep
steels
stress corrosion cracking
power plants
steam
softening
Temperature
availability
physical properties
reactors
mechanical properties
Steam
Stress corrosion cracking
cycles
Power plants
Physical properties
water
Availability
Fatigue of materials

Keywords

  • creep-fatigue
  • cyclic behaviour
  • P91 steel
  • stress relaxation

Cite this

@article{2ec38238f23844bf810761449f9a6080,
title = "Predicted life of P91 steel for cyclic high temperature service",
abstract = "The P91 steel is widely used in high temperature components of power plants, and it is a candidate material for Gen-IV reactors. The P91 steel has relatively attractive mechanical and physical properties combined with resistance to stress corrosion cracking in water-steam environments. This study aimed to explore the combined cyclic, creep and relaxation behaviour of P91 material. Uniaxial specimens were subjected to cyclic loadings with periodic forward creep or relaxation at peak stress. The results indicate that prior creep or intermediate relaxation periods up to 72 h will influence the subsequent cyclic softening of P91, but do not significantly reduce the cyclic life. In contrast, prior cycling has a detrimental effect on the subsequent creep life. A simplified creep-fatigue model is shown to predict life better than usual code-based approaches. Improved verification of all models would benefit from the availability of more extensive long-term data on P91 steel.",
keywords = "creep-fatigue, cyclic behaviour, P91 steel, stress relaxation",
author = "Rami Pohja and Stefan Holmstr{\"o}m and Pertti Auerkari and Asta Nurmela",
year = "2017",
month = "11",
day = "2",
doi = "10.1080/09603409.2017.1383710",
language = "English",
volume = "34",
pages = "301--310",
journal = "Materials at High Temperatures",
issn = "0960-3409",
publisher = "Taylor & Francis",
number = "5-6",

}

Predicted life of P91 steel for cyclic high temperature service. / Pohja, Rami (Corresponding Author); Holmström, Stefan; Auerkari, Pertti; Nurmela, Asta.

In: Materials at High Temperatures, Vol. 34, No. 5-6, 02.11.2017, p. 301-310.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Predicted life of P91 steel for cyclic high temperature service

AU - Pohja, Rami

AU - Holmström, Stefan

AU - Auerkari, Pertti

AU - Nurmela, Asta

PY - 2017/11/2

Y1 - 2017/11/2

N2 - The P91 steel is widely used in high temperature components of power plants, and it is a candidate material for Gen-IV reactors. The P91 steel has relatively attractive mechanical and physical properties combined with resistance to stress corrosion cracking in water-steam environments. This study aimed to explore the combined cyclic, creep and relaxation behaviour of P91 material. Uniaxial specimens were subjected to cyclic loadings with periodic forward creep or relaxation at peak stress. The results indicate that prior creep or intermediate relaxation periods up to 72 h will influence the subsequent cyclic softening of P91, but do not significantly reduce the cyclic life. In contrast, prior cycling has a detrimental effect on the subsequent creep life. A simplified creep-fatigue model is shown to predict life better than usual code-based approaches. Improved verification of all models would benefit from the availability of more extensive long-term data on P91 steel.

AB - The P91 steel is widely used in high temperature components of power plants, and it is a candidate material for Gen-IV reactors. The P91 steel has relatively attractive mechanical and physical properties combined with resistance to stress corrosion cracking in water-steam environments. This study aimed to explore the combined cyclic, creep and relaxation behaviour of P91 material. Uniaxial specimens were subjected to cyclic loadings with periodic forward creep or relaxation at peak stress. The results indicate that prior creep or intermediate relaxation periods up to 72 h will influence the subsequent cyclic softening of P91, but do not significantly reduce the cyclic life. In contrast, prior cycling has a detrimental effect on the subsequent creep life. A simplified creep-fatigue model is shown to predict life better than usual code-based approaches. Improved verification of all models would benefit from the availability of more extensive long-term data on P91 steel.

KW - creep-fatigue

KW - cyclic behaviour

KW - P91 steel

KW - stress relaxation

UR - http://www.scopus.com/inward/record.url?scp=85031494501&partnerID=8YFLogxK

U2 - 10.1080/09603409.2017.1383710

DO - 10.1080/09603409.2017.1383710

M3 - Article

VL - 34

SP - 301

EP - 310

JO - Materials at High Temperatures

JF - Materials at High Temperatures

SN - 0960-3409

IS - 5-6

ER -