Microstructure homogenization of laser powder bed fusion support-free low angle IN718 walls through heat treatment
This study investigates the effectiveness of heat treatment (HT) to homogenize the microstructural and mechanical asymmetry between the bulk and the downskin regions of support-free IN718 walls fabricated at angles of 30°, 20°, 15°, and 10° In the as-built condition, the microhardness ranged from 34...
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| Language: | English |
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Elsevier
2025-07-01
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| Series: | Additive Manufacturing Letters |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2772369025000453 |
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| author | Minsol Park Mudit Kesharwani Mohammad Attarian Shandiz Mathieu Brochu |
| author_facet | Minsol Park Mudit Kesharwani Mohammad Attarian Shandiz Mathieu Brochu |
| author_sort | Minsol Park |
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| description | This study investigates the effectiveness of heat treatment (HT) to homogenize the microstructural and mechanical asymmetry between the bulk and the downskin regions of support-free IN718 walls fabricated at angles of 30°, 20°, 15°, and 10° In the as-built condition, the microhardness ranged from 340 ± 5 HV to 351 ± 4 HV for the bulk and from 315 ± 4 HV to 323 ± 10 HV for the downskin region, resulting in a maximum difference range of 35 HV. The HT eliminated this difference where microhardness values of 482 ± 3 HV in the bulk and 478 ± 4 HV in the downskin were measured. The HT induced γ″ precipitation with volume fraction and mean precipitate size in the bulk of 16.6 % and 24.7 ± 7.3 nm. These values are statistically comparable to those in the downskin: 15.8 % and 26.5 ± 7.9 nm. The similarity in the γ″ characteristics explains the recovery of the mismatch in hardness as γ″ contributes approximately 85 % of the strengthening in the HT condition. |
| format | Article |
| id | doaj-art-5f0e738472904d6bb06f155b36aa9cc7 |
| institution | Matheson Library |
| issn | 2772-3690 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Additive Manufacturing Letters |
| spelling | doaj-art-5f0e738472904d6bb06f155b36aa9cc72025-07-31T04:54:05ZengElsevierAdditive Manufacturing Letters2772-36902025-07-0114100312Microstructure homogenization of laser powder bed fusion support-free low angle IN718 walls through heat treatmentMinsol Park0Mudit Kesharwani1Mohammad Attarian Shandiz2Mathieu Brochu3Department of Mining and Materials Engineering, McGill University, Montreal, QC H3A 0C5, CanadaDepartment of Mining and Materials Engineering, McGill University, Montreal, QC H3A 0C5, CanadaDepartment of Mining and Materials Engineering, McGill University, Montreal, QC H3A 0C5, CanadaCorresponding author.; Department of Mining and Materials Engineering, McGill University, Montreal, QC H3A 0C5, CanadaThis study investigates the effectiveness of heat treatment (HT) to homogenize the microstructural and mechanical asymmetry between the bulk and the downskin regions of support-free IN718 walls fabricated at angles of 30°, 20°, 15°, and 10° In the as-built condition, the microhardness ranged from 340 ± 5 HV to 351 ± 4 HV for the bulk and from 315 ± 4 HV to 323 ± 10 HV for the downskin region, resulting in a maximum difference range of 35 HV. The HT eliminated this difference where microhardness values of 482 ± 3 HV in the bulk and 478 ± 4 HV in the downskin were measured. The HT induced γ″ precipitation with volume fraction and mean precipitate size in the bulk of 16.6 % and 24.7 ± 7.3 nm. These values are statistically comparable to those in the downskin: 15.8 % and 26.5 ± 7.9 nm. The similarity in the γ″ characteristics explains the recovery of the mismatch in hardness as γ″ contributes approximately 85 % of the strengthening in the HT condition.http://www.sciencedirect.com/science/article/pii/S2772369025000453Laser powder bed fusionInconel 718support-free low angle overhangsprecipitation hardening |
| spellingShingle | Minsol Park Mudit Kesharwani Mohammad Attarian Shandiz Mathieu Brochu Microstructure homogenization of laser powder bed fusion support-free low angle IN718 walls through heat treatment Additive Manufacturing Letters Laser powder bed fusion Inconel 718 support-free low angle overhangs precipitation hardening |
| title | Microstructure homogenization of laser powder bed fusion support-free low angle IN718 walls through heat treatment |
| title_full | Microstructure homogenization of laser powder bed fusion support-free low angle IN718 walls through heat treatment |
| title_fullStr | Microstructure homogenization of laser powder bed fusion support-free low angle IN718 walls through heat treatment |
| title_full_unstemmed | Microstructure homogenization of laser powder bed fusion support-free low angle IN718 walls through heat treatment |
| title_short | Microstructure homogenization of laser powder bed fusion support-free low angle IN718 walls through heat treatment |
| title_sort | microstructure homogenization of laser powder bed fusion support free low angle in718 walls through heat treatment |
| topic | Laser powder bed fusion Inconel 718 support-free low angle overhangs precipitation hardening |
| url | http://www.sciencedirect.com/science/article/pii/S2772369025000453 |
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