Abstract
In-situ Y2O3 nanoparticles decorated Inconel 738 LC composite by powder mixture is fabricated using laser powder bed fusion with different scan speeds and laser powers. The process window is significantly enlarged with the addition of 0.05 wt% Y2O3 by removing the cracks in the as-printed parts. Well-dispersed Y4Al2O9 particles are formed during the reaction between the mixed powders and the laser beam. Obvious enrichment of Zr in the Y4Al2O9 particles by substitution for the yttrium is observed, which effectively eliminates the segregation of Zr along the grain boundaries. In this case, the cracks are mitigated since the formation of liquid film is correspondingly hindered at the last stage of solidification. In addition, the gains are coarsened to nearly double the size with the incorporation of Y2O3 nanoparticles before and after heat treatment. As a result, the Y2O3-inoculated Inconel 738 LC exhibits an improved strength at 850 °C.
Original language | English |
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Article number | 109555 |
Number of pages | 12 |
Journal | Composites Part B: Engineering |
Volume | 230 |
Early online date | 6 Dec 2021 |
DOIs | |
Publication status | Published - 1 Feb 2022 |
Bibliographical note
Funding Information:National Natural Science Foundation of China (No. 91860131), National Key Research and Development Program of China (No. 2017YFB0702901), Shenzhen Science and Technology Innovation Commission (ZDSYS201703031748354, No. JCYJ20170817111811303, No. KQTD20170328154443162), and dual-education Ph.D. project (No.FEFE/GAS1792) financially supported this research.
Publisher Copyright:
© 2021 Elsevier Ltd
Keywords
- Cracking
- Laser powder bed fusion
- Mechanical properties
- Metal-matrix composites
- Microstructure
ASJC Scopus subject areas
- Ceramics and Composites
- Mechanics of Materials
- Mechanical Engineering
- Industrial and Manufacturing Engineering