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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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

Czech name

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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

2025

Confidentiality

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

Name of the periodical

Materials Science and Engineering A Structural Materials Properties Microstructure and Processing

ISSN

0921-5093

e-ISSN

1873-4936

Volume of the periodical

924

Issue of the periodical within the volume

Feb

Country of publishing house

CH - SWITZERLAND

Number of pages

15

Pages from-to

147730

UT code for WoS article

001397546100001

EID of the result in the Scopus database

2-s2.0-85213995148