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Nanoscale Y2O3 particle–derived mechanical properties improvement in IN718 superalloy fabricated by powder bed fusion
Jialiu Yanga, Chuanwei Lia,b,* , Yao Yuana, Yuwen Huanga, Hao Zhanga, Xudong Yangc, Jianfeng Gua,b,*
Abstract
The IN718 superalloy has remarkable mechanical and formability qualities, yet its complicated precipitation management and extensive heat treatment schedules significantly prolonged production and qualification cycles. To address this limitation, Y2O3 nanoparticles were used in this study to improve the mechanical properties of powder bed fusion–processed IN718 Superalloy. With yield strength of 1023.7 ± 16.5 MPa, ultimate tensile strength of 1294.6 ± 22.1 MPa, and elongation of 25.84 ± 0.94 %, the manufactured IN718/1.5Y2O3 superalloy outperformed baseline IN718 by 28.36 %, 27.34 %, and 9.12 %, respectively. Results demonstrated that the nanoparticles modified the secondary phase distribution during rapid solidification, the nanoparticles promoted core-shell Y2O3/NbC precipitation and reducing particle size by 46.80 % while increasing density by 3.6 times. This modification intensified Nb segregation and dislocation accumulation at cell walls, resulting in a more homogeneous elemental distribution and an elevated initial dislocation density. Concurrently, semi-coherent interfaces between NbC and the matrix induced grain refinement. These effects synergistically enhanced yield strength and facilitated dislocation multiplication during deformation processes. Specifically, precipitation strengthening, grain boundary strengthening, solid solution strengthening, and dislocation strengthening collectively contributed to the material's improved mechanical strength. These findings provide valuable insights into the development of high-strength superalloys via additive manufacturing.
Nanoscale Y2O3 particle–derived mechanical properties improvement in IN718 superalloy fabricated by powder bed fusion.pdf
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