High-temperature low-cycle fatigue and fatigue–creep behaviour of Inconel 718 superalloy: Damage and deformation mechanisms

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F24%3A00586291" target="_blank" >RIV/68081723:_____/24:00586291 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21220/24:00375780

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0142112324002275?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0142112324002275?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijfatigue.2024.108369" target="_blank" >10.1016/j.ijfatigue.2024.108369</a>

Jazyk výsledku

angličtina

Název v původním jazyce

High-temperature low-cycle fatigue and fatigue–creep behaviour of Inconel 718 superalloy: Damage and deformation mechanisms

Popis výsledku v původním jazyce

In this article, strain-controlled Low-Cycle Fatigue (LCF) and fatigue–creep tests were performed on Inconeln718 nickel-based superalloy at temperatures of 650 ◦C and 730 ◦C. LCF tests at elevated temperatures werenperformed with a mechanical strain rate of 1 × 10−3/s, while fatigue–creep tests involved either tensile orncompressive strain dwell. Both the LCF and fatigue–creep tests revealed cyclic softening, with the mean stressnevolving oppositely to the applied strain dwell in the fatigue–creep tests. Investigations into the damagenmechanisms identified intergranular cracking as the predominant failure mode. Fatigue–creep loading withna compressive dwell resulted in multiple crack initiations from transgranular oxide intrusions, along withnmultiple creep cavities during loading at 730 ◦C. Deformation features such as persistent slip bands andndeformation nanotwins were observed during cycling at 650 ◦C. In addition, fatigue–creep tests at 730 ◦Cnexhibited ???? phase precipitation and a coarsening of strengthening precipitates, contributing to additionalnsoftening that increased over prolonged test durations. Finally, the observed lifetime during LCF tests decreasednwith increasing temperatures, and fatigue–creep loading was observed to be more damaging than LCF. On thenother hand, fatigue–creep loading with a tensile strain dwell demonstrated a higher lifetime compared to LCFnat 730 ◦C.

Název v anglickém jazyce

High-temperature low-cycle fatigue and fatigue–creep behaviour of Inconel 718 superalloy: Damage and deformation mechanisms

Popis výsledku anglicky

In this article, strain-controlled Low-Cycle Fatigue (LCF) and fatigue–creep tests were performed on Inconeln718 nickel-based superalloy at temperatures of 650 ◦C and 730 ◦C. LCF tests at elevated temperatures werenperformed with a mechanical strain rate of 1 × 10−3/s, while fatigue–creep tests involved either tensile orncompressive strain dwell. Both the LCF and fatigue–creep tests revealed cyclic softening, with the mean stressnevolving oppositely to the applied strain dwell in the fatigue–creep tests. Investigations into the damagenmechanisms identified intergranular cracking as the predominant failure mode. Fatigue–creep loading withna compressive dwell resulted in multiple crack initiations from transgranular oxide intrusions, along withnmultiple creep cavities during loading at 730 ◦C. Deformation features such as persistent slip bands andndeformation nanotwins were observed during cycling at 650 ◦C. In addition, fatigue–creep tests at 730 ◦Cnexhibited ???? phase precipitation and a coarsening of strengthening precipitates, contributing to additionalnsoftening that increased over prolonged test durations. Finally, the observed lifetime during LCF tests decreasednwith increasing temperatures, and fatigue–creep loading was observed to be more damaging than LCF. On thenother hand, fatigue–creep loading with a tensile strain dwell demonstrated a higher lifetime compared to LCFnat 730 ◦C.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

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

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

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

186

Číslo periodika v rámci svazku

SEP

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

17

Strana od-do

108369

Kód UT WoS článku

001249227100001

EID výsledku v databázi Scopus

2-s2.0-85194333802