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Cited 4 time in webofscience Cited 4 time in scopus
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Evolution of nanosized Cu-rich clusters in a Fe-15Cu-15Ni alloy produced by laser powder bed fusion

Authors
Jeong, JonghyunRoscher, MoritzAn, WoojinSon, SujungSeol, Jae BokSung, HyokyungKim, Hyoung SeopJagle, EricKim, Jung Gi
Issue Date
14-Jan-2022
Publisher
Elsevier BV
Keywords
Additive manufacturing; Precipitation; Steel; Spinodal decomposition; Microstructure
Citation
Materials Science and Engineering: A, v.832
Indexed
SCIE
SCOPUS
Journal Title
Materials Science and Engineering: A
Volume
832
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/1748
DOI
10.1016/j.msea.2021.142462
ISSN
0921-5093
1873-4936
Abstract
Designing a metastable microstructure with a coherent nano-sized precipitation phase in the matrix is an effective strategy in improving the strength of materials. Recently, the rapid fusion and solidification cycle associated with laser-based additive manufacturing (AM) has emerged as a promising strategy to design unique microstructures with lattice distortion, solute segregation, and nano-sized precipitations. In this study, the evolution of nano-sized Cu-rich clusters in an AM-processed Fe-15Cu-15Ni alloy (wt.%) was investigated by conducting multiscale microstructural characterization. The results reveal that nano-sized Cu-rich clusters were generated inside the matrix due to a phase decomposition induced by the intrinsic heat treatment during the AM process. The heat energy generated by the laser beam not only initiated Cu-rich cluster formation, but also induced precipitation growth. Therefore, the average Cu-rich cluster size increased with an increase in the volumetric energy density. The hardness of the AM-processed Fe-15Cu-15Ni alloy at first increased with an increase in the energy density until a medium energy density level (140 J/mm(3)), due to formation of Cu-rich clusters. The hardness decreased with further increase in energy density (185 J/mm(3)), due to the Cu-rich cluster growth and retained austenite. The results reveal that laser-based AM successfully induces nano-cluster without the need for post-treatment and that the mechanical properties of materials can be optimized by adjusting the processing parameters in a way to enable nano-sized cluster and phase formation.
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대학원 (나노신소재융합공학과)
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