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Fatigue crack initiation and propagation in plain and notched PBF-LB/M, WAAM, and wrought 316L stainless steel specimens
Citation Link: https://doi.org/10.15480/882.13147
Publikationstyp
Journal Article
Date Issued
2024-08
Sprache
English
Author(s)
TORE-DOI
Journal
Volume
244
Article Number
113122
Citation
Materials and Design 244: 113122 (2024)
Publisher DOI
Scopus ID
Publisher
Elsevier
Additively manufactured (AM) components—either made by laser-powder bed fusion or wire and arc additive manufacturing—typically contain process-related defects on and near surfaces that can be removed by machining. Various studies have shown that post-treatment, such as machining significantly improves the fatigue strength of AM parts. To this day, however, hardly any studies have investigated the fatigue strength of post-treated additively manufactured components with notches. In this study, fatigue tests were performed on plain and notched specimens to determine and compare the crack initiation and crack propagation behavior due to different manufacturing-related effects. Tests were performed on specimens produced by the two aforementioned AM processes and compared to specimens taken from wrought sheets. The fatigue strength of AM materials is influenced by microstructure, defects, residual stress, and notches. PBF-LB/M specimens exhibit the highest fatigue strength in plain, notch-free conditions, attributed to differences in microstructure and static strength affecting fatigue crack initiation. Notched specimens show larger differences among materials, with PBF-LB/M having shorter fatigue crack propagation life related to line-type defect clusters, while the plain PBF-LB/M specimens are less affected as their fatigue strength is primarily determined by fatigue crack initiation.
Subjects
Fatigue strength assessment
Hybrid additive manufacturing
Microstructural defects
Post-production treatment
Selective laser melting
Wire arc additive manufacturing
DDC Class
620: Engineering
670: Manufacturing
Publication version
publishedVersion
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Name
1-s2.0-S0264127524004969-main.pdf
Type
Main Article
Size
19.14 MB
Format
Adobe PDF