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Linder, C., Vucko, F., Ma, T., Proper, S. & Dartfeldt, E. (2023). Corrosion-Fatigue Performance of 3D-Printed (L-PBF) AlSi10Mg. MATERIALS, 16(17), Article ID 5964.
Open this publication in new window or tab >>Corrosion-Fatigue Performance of 3D-Printed (L-PBF) AlSi10Mg
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2023 (English)In: MATERIALS, Vol. 16, no 17, article id 5964Article in journal (Refereed) Published
Abstract [en]

Additive manufacturing (AM) allows for optimized part design, reducing weight compared to conventional manufacturing. However, the microstructure, surface state, distribution, and size of internal defects (e.g., porosities) are very closely related to the AM fabrication process and post-treatment operations. All these parameters can have a strong impact on the corrosion and fatigue performance of the final component. Thus, the fatigue-corrosion behavior of the 3D-printed (L-PBF) AlSi10Mg aluminum alloy has been investigated. The influence of load sequence (sequential vs. combined) was explored using Wohler diagrams. Surface roughness and defects in AM materials were examined, and surface treatment was applied to improve surface quality. The machined specimens showed the highest fatigue properties regardless of load sequence by improving both the roughness and removing the contour layer containing the highest density of defect. The impact of corrosion was more pronounced for as-printed specimens as slightly deeper pits were formed, which lowered the fatigue-corrosion life. As discussed, the corrosion, fatigue and fatigue-corrosion mechanisms were strongly related to the local microstructure and existing defects in the AM sample.

Place, publisher, year, edition, pages
MDPI, 2023
Keywords
atmospheric corrosion; fatigue; additive manufacturing; 3D printing; aluminum alloys; AlSi10Mg
National Category
Materials Engineering
Identifiers
urn:nbn:se:ri:diva-70148 (URN)10.3390/ma16175964 (DOI)
Note

This research received no external funding.

Available from: 2024-01-22 Created: 2024-01-22 Last updated: 2024-05-21Bibliographically approved
Sjögren, T., Hall, S., Elmquist, L., Dartfeldt, E., Larsson, E., Majkut, M., . . . Engqvist, J. (2020). In situ analysis of cast irons mechanical behaviour using synchrotron x-ray tomography and 3DXRD. In: : . Paper presented at MCWASP XV - Modelling of Casting, Welding and Advanced Solidification Processes (pp. 012039). , 861
Open this publication in new window or tab >>In situ analysis of cast irons mechanical behaviour using synchrotron x-ray tomography and 3DXRD
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2020 (English)Conference paper, Published paper (Refereed)
Abstract [en]

When subjecting cast irons to mechanical loading the deformation and damage mechanisms occur on a microstructural level and are dependent on the inherent microstructure. A deeper understanding of the relation between the different microstructural constituents and the macroscopic mechanical behaviour would be beneficial in material development efforts and for the ability to design and cast components with tailored properties. Traditionally, microscopy examinations on sectioned cast iron samples have been used when analysing the microstructure in cast irons. Since all microstructural heterogeneity is in three-dimensions (3D), methods that provide a three-dimensional characterisation are essential for a deeper understanding of, both the microstructural features as well as the deformation and damage of cast irons. Therefore, different cast iron grades have been studied using synchrotron X-ray tomography and 3D x-ray diffraction (3DXRD) at ESRF in Grenoble, France. The samples were stepwise loaded and unloaded in-situ at in the tomography/3DXRD set-up to study the deformation with regard to microstructural constituents and the microstructural evolution in 3D. Based on the 3D tomography image sequences, digital volume correlation (DVC) was used for full strain field analysis and for the analysis of damage and deformation mechanisms. In addition, 3DXRD data were analysed to provide details on the lattice parameters and lattice strain of individual ferrite grains. This work shows the possibilities of such synchrotron experiments for advanced study of the mechanical behaviour of cast iron.

Series
IOP Conference Series: Materials Science and Engineering
Keywords
Synchrotron X-ray microtomography, in situ, cast iron
National Category
Metallurgy and Metallic Materials Radiology, Nuclear Medicine and Medical Imaging
Identifiers
urn:nbn:se:ri:diva-45140 (URN)10.1088/1757-899X/861/1/012039 (DOI)2-s2.0-85087020333 (Scopus ID)
Conference
MCWASP XV - Modelling of Casting, Welding and Advanced Solidification Processes
Available from: 2020-06-29 Created: 2020-06-29 Last updated: 2023-06-08Bibliographically approved
Elmquist, L., Hall, S., Sjögren, T., Dartfeldt, E., Skoglund, P., Elfsberg, J. & Majkut, M. (2018). Mechanical and structural characterization of cast iron using synchrotron light. In: 73rd World Foundry Congress "Creative Foundry", WFC 2018 - Proceedings: . Paper presented at 73rd World Foundry Congress: Creative Foundry, WFC 2018, 23 September 2018 through 27 September 2018 (pp. 129-130).
Open this publication in new window or tab >>Mechanical and structural characterization of cast iron using synchrotron light
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2018 (English)In: 73rd World Foundry Congress "Creative Foundry", WFC 2018 - Proceedings, 2018, p. 129-130Conference paper, Published paper (Refereed)
Abstract [en]

The paper describes work done using synchrotron light to investigate the microstructure and how it behaves in 3D when a load is applied. Two different cast iron materials with different matrix structures and graphite morphologies were investigated; SiMo51, which is basically a spheroidal iron (SGI) alloyed with Si and Mo, and a lamellar graphite iron (LGI). The tensile test specimens were loaded in steps, at which x-ray tomography as well as 3DXRD measurements were made to characterize the microstructure. The result shows how the crack propagates and which path it takes through the materials. DVC was applied to analyze the strain fields. This work also shows how useful synchrotron experiments can be in the study of the mechanical behavior of cast iron.

Keywords
Crack propagation, DVC, Graphite, SiMo ductile iron, Synchrotron light, Cracks, Foundries, Microstructure, Synchrotron radiation, Tensile testing, Cast iron materials, Graphite morphology, Matrix structure, Mechanical behavior, Structural characterization, Test specimens, X-ray tomography, Cast iron
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-38240 (URN)2-s2.0-85062302876 (Scopus ID)9788390430638 (ISBN)
Conference
73rd World Foundry Congress: Creative Foundry, WFC 2018, 23 September 2018 through 27 September 2018
Available from: 2019-04-02 Created: 2019-04-02 Last updated: 2023-06-08Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-1248-8229

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