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- Cui, LuqingLinköpings universitet,Konstruktionsmaterial,Tekniska fakulteten (author)
Superior low cycle fatigue property from cell structures in additively manufactured 316L stainless steel
- Article/chapterEnglish2022
Publisher, publication year, extent ...
- Amsterdam, Netherlands :Elsevier,2022
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- LIBRIS-ID:oai:DiVA.org:liu-182257
- https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-182257URI
- https://doi.org/10.1016/j.jmst.2021.10.006DOI
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- Language:English
- Summary in:English
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- Funding: Swedish Governmental Agency for Innovation Systems (Vinnova) [2016-05175]; Science Foundation Ireland (SFI) [16/RC/3872]; Center for Additive Manufacturing-metal (CAM2); Ji Hua Laboratory [X210141TL210]
- We have investigated the low cycle fatigue (LCF) properties and the extent of strengthening in a dense additively manufactured stainless steel containing different volume fractions of cell structures but having all other microstructure characteristics the same. The samples were produced by laser powder bed fusion (L-PBF), and the concentration of cell structures was varied systematically by varying the annealing treatments. Load-controlled fatigue experiments performed on samples with a high fraction of cell structures reveal an up to 23 times increase in fatigue life compared to an essentially cell-free sample of the same grain configuration. Multiscale electron microscopy characterizations reveal that the cell structures serve as the soft barriers to the dislocation propagation and the partials are the main carrier for cyclic loading. The cell structures, stabilized by the segregated atoms and misorientation between the adjacent cells, are retained during the entire plastic deformation, hence, can continuously interact with dislocations, promote the formation of nanotwins, and provide massive 3D network obstacles to the dislocation motion. The compositional micro-segregation caused by the cellular solidification features serves as another non-negligible strengthening mechanism to dislocation motion. Specifically, the cell structures with a high density of dislocation debris also appear to act as dislocation nucleation sites, very much like coherent twin boundaries. This work indicates the potential of additive manufacturing to design energy absorbent alloys with high performance by tailoring the microstructure through the printing process.
Subject headings and genre
- TEKNIK OCH TEKNOLOGIER Materialteknik hsv//swe
- ENGINEERING AND TECHNOLOGY Materials Engineering hsv//eng
- Additive manufacturing
- 316L stainless steel
- fatigue behavior
- cellular structure
- nanotwins
Added entries (persons, corporate bodies, meetings, titles ...)
- Deng, Dunyong,1989-Linköpings universitet,Konstruktionsmaterial,Tekniska fakulteten(Swepub:liu)dunde74 (author)
- Jiang, FuqingShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China (author)
- Peng, Ru Lin,1960-Linköpings universitet,Konstruktionsmaterial,Tekniska fakulteten(Swepub:liu)rupe37 (author)
- Xin, TongzhengSchool of Materials Science and Engineering, The University of New South Wales, Sydney, NSW, Australia (author)
- Mousavian, Reza TaherzadehI-Form, Advanced Manufacturing Research Centre, Dublin City University, Dublin, Ireland (author)
- Yang, ZhiqingShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China; Ji Hua Laboratory, Foshan, China (author)
- Moverare, Johan,1973-Linköpings universitet,Konstruktionsmaterial,Tekniska fakulteten(Swepub:liu)johmo31 (author)
- Linköpings universitetKonstruktionsmaterial (creator_code:org_t)
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- In:Journal of Materials Science & TechnologyAmsterdam, Netherlands : Elsevier111, s. 268-2781005-0302
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