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• W4366753685 abstract "An internal support-free Inconel 625 (IN625) closed impeller of 10.25 cm, and 20.5 cm diameter at 30 μm and 60 μm layer thickness is fabricated successfully. The document identifies the zero-degree lowest angle feature as a critical section to base the downskin and bulk study discussion. A systematic investigation of the microstructure and mechanical properties of both the bulk and downskin sections is conducted. Impeller fabricated at 60 μm layer thickness reported lower residual stress (RS) (183 ± 10 MPa) compared to 30 μm impeller RS (227 ± 75 MPa). Scanning electron microscope (SEM) and electron backscattered diffraction (EBSD) confirm hierarchical microstructures consisting of cellular sub-grain structures inside columnar grains spread across the bulk region of the impeller. The impeller shows excellent tensile properties with a maximum yield stress of 790 MPa, a maximum ultimate tensile strength of 1040 MPa, and a maximum ductility of 45%. The downskin region near the critical section experiences high heat accumulation due to the poor thermal conductivity of the powder. As a result, the PDAS of the critical section is 6.67 times high than the bulk region and has a maximum drop of 20.7% in microhardness. The critical section of the 20.5 cm diameter Impeller at 30 μm and 60 μm layer thickness shows a maximum downskin thickness affected due to heat accumulation are 480 μm and 310 μm." @default.
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• W4366753685 date "2023-05-01" @default.
• W4366753685 modified "2023-10-18" @default.
• W4366753685 title "Microstructural and mechanical properties of an internal support-free IN625 closed impeller manufactured via laser powder bed fusion (L-PBF)" @default.
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• W4366753685 doi "https://doi.org/10.1016/j.msea.2023.145080" @default.
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