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

Result code in 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>

Alternative codes found

RIV/68407700:21220/24:00375780

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20501 - Materials engineering

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

International Journal of Fatigue

ISSN

0142-1123

e-ISSN

1879-3452

Volume of the periodical

186

Issue of the periodical within the volume

SEP

Country of publishing house

GB - UNITED KINGDOM

Number of pages

17

Pages from-to

108369

UT code for WoS article

001249227100001

EID of the result in the Scopus database

2-s2.0-85194333802