Review of Laser Powder Bed Fusion of Gamma-Prime-Strengthened Nickel-Based Superalloys

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ID: 110115
2020
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Abstrak
This paper reviews state of the art laser powder bed fusion (L-PBF) manufacturing of γ′ nickel-based superalloys. L-PBF resembles welding; therefore, weld-cracking mechanisms, such as solidification, liquation, strain age, and ductility-dip cracking, may occur during L-PBF manufacturing. Spherical pores and lack-of-fusion voids are other defects that may occur in γ′-strengthened nickel-based superalloys manufactured with L-PBF. There is a correlation between defect formation and the process parameters used in the L-PBF process. Prerequisites for solidification cracking include nonequilibrium solidification due to segregating elements, the presence of liquid film between cells, a wide critical temperature range, and the presence of thermal or residual stress. These prerequisites are present in L-PBF processes. The phases found in L-PBF-manufactured γ′-strengthened superalloys closely resemble those of the equivalent cast materials, where γ, γ′, and γ/γ′ eutectic and carbides are typically present in the microstructure. Additionally, the sizes of the γ′ particles are small in as-built L-PBF materials because of the high cooling rate. Furthermore, the creep performance of L-PBF-manufactured materials is inferior to that of cast material because of the presence of defects and the small grain size in the L-PBF materials; however, some vertically built L-PBF materials have demonstrated creep properties that are close to those of cast materials.
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Penulis Olutayo Adegoke;Joel Andersson;Håkan Brodin;Robert Pederson;Adegoke, Olutayo;Andersson, Joel;Brodin, Håkan;Pederson, Robert;
Jurnal metals
Tahun 2020
DOI
10.3390/met10080996
URL
https://doi.org/10.3390/met10080996
Kata Kunci
microstructure defects nickel-based superalloy laser powder bed fusion cracks microstructure defects nickel-based superalloy laser powder bed fusion cracks

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