期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 924, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.166513
关键词
Laser directed energy deposition; High entropy alloy; Laser energy density; Microstructure; Mechanical properties
资金
- Interdisciplinary Research Foundation of HIT [IR2021201]
- National Natural Science Foundation of China [51871076, 52171154]
- National Key Research and Development Programs of China [2018YFB1105200, 2019YFA0209904]
- Guangdong Province Basic and Applied Research Key Projects [2020190718102]
- National Key R&D Programme, Ministry of Science and Technology of China [2019YFA0209]
- CGN-HIT Advanced Nuclear and New Energy Research Institute [CGNHIT202209]
The effects of laser energy density (LED) on the microstructure and mechanical properties of single-track CoCrFeMnNi high entropy alloy (HEA) samples fabricated by laser directed energy deposition (LDED) were studied. The results showed that increasing LED led to larger molten pool size, increased grain size, and decreased micro-hardness in the samples. The relationship among processing parameters, cooling rate, and grain size was investigated through numerical simulation and experimental observations.
Tailoring microstructure and mechanical properties of structural materials to meet application requirements is a long-standing challenge in materials science. Here we have studied the effects of laser energy density (LED) on the microstructure and mechanical properties of single-track CoCrFeMnNi high entropy alloy (HEA) samples fabricated by laser directed energy deposition (LDED). The results indicate that the molten pool size of the single-track HEA samples gradually increases with increasing LED. All of the samples possess a single face-centered cubic (FCC) solid solution structure. The microstructures of the single-track HEA samples are mainly composed of columnar and equiaxed grains, and as the LED increases, their grain size increases while the micro-hardness decreases. Additionally, the relationship among the processing parameters, cooling rate and grain size was investigated via combining the numerical simulation and experimental observations. This work provides mechanistic insights into establishing the processing-structure-property relationships in the additively manufactured HEAs and contributes to achieve LDED of tunable HEA parts with desired microstructure and mechanical performance. (c) 2022 Elsevier B.V. All rights reserved.
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