期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.142462
关键词
Additive manufacturing; Precipitation; Steel; Spinodal decomposition; Microstructure
类别
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2020R1A4A3079417, NRF-2021R1A2C4002622]
- Ministry of Trade, Industry, and Energy of the Republic of Korea [20214000000480]
Designing a metastable microstructure with coherent nano-sized precipitations in the matrix is an effective approach to improve materials' strength. In this study, the evolution of nano-sized Cu-rich clusters in an AM-processed Fe-15Cu-15Ni alloy was investigated. The results indicate that the laser-based AM process induced phase decomposition and led to the formation of nano-sized Cu-rich clusters, which contributed to the increase in average cluster size and hardness of the alloy. Adjusting the processing parameters can optimize the mechanical properties of materials by enabling nano-sized cluster and phase formation.
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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