Room-temperature low-cycle fatigue behaviour of cast and additively manufactured IN939 superalloy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F25%3A00603545" target="_blank" >RIV/68081723:_____/25:00603545 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0921509324016617?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0921509324016617?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2024.147730" target="_blank" >10.1016/j.msea.2024.147730</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Room-temperature low-cycle fatigue behaviour of cast and additively manufactured IN939 superalloy

Popis výsledku v původním jazyce

The present study compares the fatigue properties of IN939 superalloy manufactured conventionally by casting and additively by laser powder bed fusion (L-PBF). To investigate the influence of specimen orientation, i.e. load-to-build direction, and heat treatment on fatigue properties, 4 batches of additively manufactured specimens were prepared: vertically and horizontally oriented batches with either as-built microstructure (non-treated) or aged γ/γ’ microstructure. Cylindrical specimens were machined from the cast rod and printed blocks, and subjected to low-cycle fatigue loading at room temperature. Fatigue testing was conducted in total strain amplitude control within εa = 0.27–1% with a constant strain rate of 2∙10−3 s−1. Scanning and transmission electron microscopy techniques were used to analyse the specimens before and after testing. Out of all tested batches, horizontal aged L-PBF IN939 exhibited the best stress-life fatigue properties, while vertical non-treated L-PBF specimens showed the largest resistance to cyclic plastic straining. Plastic strain localization occurred in the form of persistent slip bands, which led to fatigue crack initiation at the specimen surface. The high stresses associated with the L-PBF batches favour interdendritic and intergranular cracking, increasingly so with higher batch strength. However, the cracking mechanism does not significantly affect the low-cycle fatigue life, which is primarily determined by the crack initiation phase.n

Název v anglickém jazyce

Room-temperature low-cycle fatigue behaviour of cast and additively manufactured IN939 superalloy

Popis výsledku anglicky

The present study compares the fatigue properties of IN939 superalloy manufactured conventionally by casting and additively by laser powder bed fusion (L-PBF). To investigate the influence of specimen orientation, i.e. load-to-build direction, and heat treatment on fatigue properties, 4 batches of additively manufactured specimens were prepared: vertically and horizontally oriented batches with either as-built microstructure (non-treated) or aged γ/γ’ microstructure. Cylindrical specimens were machined from the cast rod and printed blocks, and subjected to low-cycle fatigue loading at room temperature. Fatigue testing was conducted in total strain amplitude control within εa = 0.27–1% with a constant strain rate of 2∙10−3 s−1. Scanning and transmission electron microscopy techniques were used to analyse the specimens before and after testing. Out of all tested batches, horizontal aged L-PBF IN939 exhibited the best stress-life fatigue properties, while vertical non-treated L-PBF specimens showed the largest resistance to cyclic plastic straining. Plastic strain localization occurred in the form of persistent slip bands, which led to fatigue crack initiation at the specimen surface. The high stresses associated with the L-PBF batches favour interdendritic and intergranular cracking, increasingly so with higher batch strength. However, the cracking mechanism does not significantly affect the low-cycle fatigue life, which is primarily determined by the crack initiation phase.n

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

2025

Kód důvěrnosti údajů

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

Název periodika

Materials Science and Engineering A Structural Materials Properties Microstructure and Processing

ISSN

0921-5093

e-ISSN

1873-4936

Svazek periodika

924

Číslo periodika v rámci svazku

Feb

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

15

Strana od-do

147730

Kód UT WoS článku

001397546100001

EID výsledku v databázi Scopus

2-s2.0-85213995148