Microstructure and mechanical properties of selective laser melted superalloy inconel 625.

Anam, Ashabul

doi:10.18297/etd/3029

Cited by 7 publications

(9 citation statements)

References 70 publications

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“…In terms of elongation and reduction of area, the specimens manufactured along the Z-axis presented higher elongation at fracture and reduction of area, as compared with the results for the other building orientations. The strength increase as the orientation angle decreases was also observed by Anam [68].…”

Section: Discussionsupporting

confidence: 66%

Microstructural and Tensile Properties Anisotropy of Selective Laser Melting Manufactured IN 625

et al. 2020

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The present study was focused on the assessment of microstructural anisotropy of IN 625 manufactured by selective laser melting (SLM) and its influence on the material’s room temperature tensile properties. Microstructural anisotropy was assessed based on computational and experimental investigations. Tensile specimens were manufactured using four building orientations (along Z, X, Y-axis, and tilted at 45° in the XZ plane) and three different scanning strategies (90°, 67°, and 45°). The simulation of microstructure development in specimens built along the Z-axis, applying all three scanning strategies, showed that the as-built microstructure is strongly textured and is influenced by the scanning strategy. The 45° scanning strategy induced the highest microstructural texture from all scanning strategies used. The monotonic tensile test results highlighted that the material exhibits significant anisotropic properties, depending on both the specimen orientation and the scanning strategy. Regardless of the scanning strategy used, the lowest mechanical performances of IN 625, in terms of strength values, were recorded for specimens built in the vertical position, as compared with all the other orientations.

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Section: Discussionsupporting

confidence: 66%

Microstructural and Tensile Properties Anisotropy of Selective Laser Melting Manufactured IN 625

et al. 2020

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“…These features are not characteristic of the fracture surface for the more standard vertical tensile geometries where the dimple structure is homogeneous [4]. However, Anam [35] and Gonzales, et al [36], have also recently illustrated inhomogeneous and linear dimple structures in the build direction for Inconel 625 tensile samples fractured in the horizontal direction (perpendicular to the build direction) as in Figure 7. It is also interesting that the overall, smaller dimple features in Figure 7 (a) in contrast to Figure 7 (b) are generally consistent with the corresponding yield stress values shown in Table 3: 387 MPa versus 330 MPa, respectively.…”

Section: Fracture Surface Observations and Discussionmentioning

confidence: 93%

Effect of Layer Thickness and Heat Treatment on Microstructure and Mechanical Properties of Alloy 625 Manufactured by Electron Beam Powder Bed Fusion

Díaz¹,

Watanabe²,

Rubio³

et al. 2022

Preprint

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This research program investigated the effects of layer thickness (50 and 100 microns) on the microstructure and mechanical properties of electron beam powder bed fusion (EBPBF) additive manufacturing of Inconel 625 alloy. The as-built 50 and 100 micron layer thickness components were also heat treated at temperatures above 1100 oC, which produced a recrystallized grain structure containing annealing twins in the 50 micron layer thickness components, and a duplex grain structure consisting of islands of very small equiaxed grains dispersed in a recrystallized, large-grain structure containing annealing twins. The heat treated component microstructures and mechanical properties were compared with the as-built components in both the build direction (vertical) and perpendicular (horizontal) to the build direction. Vickers microindentation hardness (HV) values for the vertical and horizontal geometries averaged 227 and 220 for the as-built 50 and 100 micron layer components, and 185 and 282 for the corresponding heat treated components. The yield stress values were 387 MPa and 365 MPa for the as-built layer horizontal and vertical 50 micron layer geometries, and 330 MPa and 340 MPa for the as-built 100 micron layer components. For the heat treated 50 micron components, the yield stress values were 340 and 321 MPa for the horizontal and vertical geometries, and 581 and 489 MPa for the 100 micron layer components, respectively. The elongation for the 100 micron layer as-built horizontal components was 28% in contrast to 65% for the corresponding 100 micron heat treated layer components, an increase of 132% for the duplex grain structure. However, the coarse grains containing annealing twins and the equiaxed small grain islands in the duplex structure for the heat treated components contained continuous carbides in the grain boundaries, and this may indicate sensitization and a reduction in corrosion resistance. These findings point to the potential mechanical property advantage for heat treatment of Inconel 625 alloy 100 micron layer thickness components fabricated by EBPBF.

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“…These features are not characteristic of the fracture surface for the more standard vertical tensile geometries where the dimple structure is homogeneous [ 4 ]. However, Anam [ 35 ] and Gonzales et al [ 36 ] have also recently illustrated inhomogeneous and linear dimple structures in the build direction for Inconel 625 tensile samples fractured in the horizontal direction (perpendicular to the build direction) as in Figure 7 . It is also interesting that the overall smaller dimple features in Figure 7 a in contrast with Figure 7 b are generally consistent with the corresponding yield stress values shown in Table 3 : 387 MPa versus 330 MPa, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effect of Layer Thickness and Heat Treatment on Microstructure and Mechanical Properties of Alloy 625 Manufactured by Electron Beam Powder Bed Fusion

et al. 2022

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This research program investigated the effects of layer thickness (50 µm and 100 µm) on the microstructure and mechanical properties of electron beam powder bed fusion (EBPBF) additive manufacturing of Inconel 625 alloy. The as-built 50 µm and 100 µm layer thickness components were also heat treated at temperatures above 1100 °C which produced a recrystallized grain structure containing annealing twins in the 50 µm layer thickness components, and a duplex grain structure consisting of islands of very small equiaxed grains dispersed in a recrystallized, large-grain structure containing annealing twins. The heat-treated components of the microstructures and mechanical properties were compared with the as-built components in both the build direction (vertical) and perpendicular (horizontal) to the build direction. Vickers microindentation hardness (HV) values for the vertical and horizontal geometries averaged 227 and 220 for the as-built 50 µm and 100 µm layer components, respectively, and 185 and 282 for the corresponding heat-treated components. The yield stress values were 387 MPa and 365 MPa for the as-built horizontal and vertical 50 µm layer geometries, and 330 MPa and 340 MPa for the as-built 100 µm layer components. For the heat-treated 50 µm components, the yield stress values were 340 and 321 MPa for the horizontal and vertical geometries, and 581 and 489 MPa for the 100 µm layer components, respectively. The elongation for the 100 µm layer as-built horizontal components was 28% in contrast with 65% for the corresponding 100 µm heat-treated layer components, an increase of 132% for the duplex grain structure.

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Microstructure and mechanical properties of selective laser melted superalloy inconel 625.

Cited by 7 publications

References 70 publications

Microstructural and Tensile Properties Anisotropy of Selective Laser Melting Manufactured IN 625

Microstructural and Tensile Properties Anisotropy of Selective Laser Melting Manufactured IN 625

Effect of Layer Thickness and Heat Treatment on Microstructure and Mechanical Properties of Alloy 625 Manufactured by Electron Beam Powder Bed Fusion

Effect of Layer Thickness and Heat Treatment on Microstructure and Mechanical Properties of Alloy 625 Manufactured by Electron Beam Powder Bed Fusion

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