Isothermal low-cycle fatigue and fatigue-creep behaviour of boron-added 9% Cr martensitic stainless steel at 600°C

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F25%3A00384521" target="_blank" >RIV/68407700:21220/25:00384521 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.ijfatigue.2024.108800" target="_blank" >https://doi.org/10.1016/j.ijfatigue.2024.108800</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijfatigue.2024.108800" target="_blank" >10.1016/j.ijfatigue.2024.108800</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Isothermal low-cycle fatigue and fatigue-creep behaviour of boron-added 9% Cr martensitic stainless steel at 600°C

Popis výsledku v původním jazyce

In this article, strain-controlled Low-Cycle Fatigue (LCF) and fatigue-creep tests were conducted on COST FB2, a boron-added 9% Cr martensitic stainless steel, at 600 degrees C. LCF tests were performed with a mechanical strain rate of 1 x 10 -3 /s, while the fatigue-creep tests involved either tensile or compressive strain dwells lasting 600 s. Both the LCF and fatigue-creep tests revealed cyclic softening behaviour, with the magnitude of relaxed stress decreasing with cycles in the fatigue-creep tests. This softening was associated with the coarsening of the laths and subgrains and a reduction in dislocation density, both of which were more pronounced for LCF loading at higher strain amplitudes and during fatigue-creep loading. Investigations into the damage mechanisms identified environmentally assisted transgranular cracking as the predominant failure mode, with the severity of oxidation-induced cracking increasing with higher applied strain amplitudes or during fatigue- creep loading with compressive dwell, while cracking was suppressed during tests with tensile strain dwell. Finally, a damage model combining the strain-life approach with a time-dependent damage term was proposed to effectively predict the reduction in lifetime during fatigue-creep tests compared to continuous LCF cycling.

Název v anglickém jazyce

Isothermal low-cycle fatigue and fatigue-creep behaviour of boron-added 9% Cr martensitic stainless steel at 600°C

Popis výsledku anglicky

In this article, strain-controlled Low-Cycle Fatigue (LCF) and fatigue-creep tests were conducted on COST FB2, a boron-added 9% Cr martensitic stainless steel, at 600 degrees C. LCF tests were performed with a mechanical strain rate of 1 x 10 -3 /s, while the fatigue-creep tests involved either tensile or compressive strain dwells lasting 600 s. Both the LCF and fatigue-creep tests revealed cyclic softening behaviour, with the magnitude of relaxed stress decreasing with cycles in the fatigue-creep tests. This softening was associated with the coarsening of the laths and subgrains and a reduction in dislocation density, both of which were more pronounced for LCF loading at higher strain amplitudes and during fatigue-creep loading. Investigations into the damage mechanisms identified environmentally assisted transgranular cracking as the predominant failure mode, with the severity of oxidation-induced cracking increasing with higher applied strain amplitudes or during fatigue- creep loading with compressive dwell, while cracking was suppressed during tests with tensile strain dwell. Finally, a damage model combining the strain-life approach with a time-dependent damage term was proposed to effectively predict the reduction in lifetime during fatigue-creep tests compared to continuous LCF cycling.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20302 - Applied mechanics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

International Journal of Fatigue

ISSN

0142-1123

e-ISSN

1879-3452

Svazek periodika

193

Číslo periodika v rámci svazku

108800

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

17

Strana od-do

—

Kód UT WoS článku

001400618200001

EID výsledku v databázi Scopus

2-s2.0-85214564111