Optimization of the Post-Process Heat Treatment of Inconel 718 Superalloy Fabricated by Laser Powder Bed Fusion Process
In the present study, multi-objective optimization is employed to develop the optimum heat treatments that can achieve both high-mechanical performance and non-distinctive crystallographic texture of 3D printed Inconel 718 (IN718) fabricated by laser powder bed fusion (LPBF). Heat treatments includi...
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| Format: | Article |
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MDPI AG
2021-01-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/1/144 |
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| author | Eslam M. Fayed Mohammad Saadati Davood Shahriari Vladimir Brailovski Mohammad Jahazi Mamoun Medraj |
| author_facet | Eslam M. Fayed Mohammad Saadati Davood Shahriari Vladimir Brailovski Mohammad Jahazi Mamoun Medraj |
| author_sort | Eslam M. Fayed |
| collection | DOAJ |
| description | In the present study, multi-objective optimization is employed to develop the optimum heat treatments that can achieve both high-mechanical performance and non-distinctive crystallographic texture of 3D printed Inconel 718 (IN718) fabricated by laser powder bed fusion (LPBF). Heat treatments including homogenization at different soaking times (2, 2.5, 3, 3.5 and 4 h) at 1080 °C, followed by a 1 h solution treatment at 980 °C and the standard aging have been employed. 2.5 h is found to be the homogenization treatment threshold after which there is a depletion of hardening precipitate constituents (Nb and Ti) from the γ-matrix. However, a significant number of columnar grains with a high fraction (37.8%) of low-angle grain boundaries (LAGBs) have still been retained after the 2.5 h homogenization treatment. After a 4 h homogenization treatment, a fully recrystallized IN718 with a high fraction of annealing twins (87.1%) is obtained. 2.5 and 4 h homogenization treatments result in tensile properties exceeding those of the wrought IN718 at both RT and 650 °C. However, considering the texture requirements, it is found that the 4 h homogenization treatment offers the optimum treatment, which can be used to produce IN718 components offering a balanced combination of high mechanical properties and adequate microstructural isotropy. |
| first_indexed | 2024-03-09T05:03:28Z |
| format | Article |
| id | doaj.art-a88206ed7d67498ba904fb006a7b62f0 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T05:03:28Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-a88206ed7d67498ba904fb006a7b62f02023-12-03T12:57:32ZengMDPI AGMetals2075-47012021-01-0111114410.3390/met11010144Optimization of the Post-Process Heat Treatment of Inconel 718 Superalloy Fabricated by Laser Powder Bed Fusion ProcessEslam M. Fayed0Mohammad Saadati1Davood Shahriari2Vladimir Brailovski3Mohammad Jahazi4Mamoun Medraj5Department of Mechanical, Industrial and Aerospace Engineering, Concordia University, 1515 Rue Sainte Catherine West, Montreal, QC H3G 2W1, CanadaDepartment of Mechanical Engineering, École de Technologie Supérieure, 1100, Notre-Dame Street West, Montreal, QC H3C 1K3, CanadaDepartment of Mechanical Engineering, École de Technologie Supérieure, 1100, Notre-Dame Street West, Montreal, QC H3C 1K3, CanadaDepartment of Mechanical Engineering, École de Technologie Supérieure, 1100, Notre-Dame Street West, Montreal, QC H3C 1K3, CanadaDepartment of Mechanical Engineering, École de Technologie Supérieure, 1100, Notre-Dame Street West, Montreal, QC H3C 1K3, CanadaDepartment of Mechanical, Industrial and Aerospace Engineering, Concordia University, 1515 Rue Sainte Catherine West, Montreal, QC H3G 2W1, CanadaIn the present study, multi-objective optimization is employed to develop the optimum heat treatments that can achieve both high-mechanical performance and non-distinctive crystallographic texture of 3D printed Inconel 718 (IN718) fabricated by laser powder bed fusion (LPBF). Heat treatments including homogenization at different soaking times (2, 2.5, 3, 3.5 and 4 h) at 1080 °C, followed by a 1 h solution treatment at 980 °C and the standard aging have been employed. 2.5 h is found to be the homogenization treatment threshold after which there is a depletion of hardening precipitate constituents (Nb and Ti) from the γ-matrix. However, a significant number of columnar grains with a high fraction (37.8%) of low-angle grain boundaries (LAGBs) have still been retained after the 2.5 h homogenization treatment. After a 4 h homogenization treatment, a fully recrystallized IN718 with a high fraction of annealing twins (87.1%) is obtained. 2.5 and 4 h homogenization treatments result in tensile properties exceeding those of the wrought IN718 at both RT and 650 °C. However, considering the texture requirements, it is found that the 4 h homogenization treatment offers the optimum treatment, which can be used to produce IN718 components offering a balanced combination of high mechanical properties and adequate microstructural isotropy.https://www.mdpi.com/2075-4701/11/1/144heat treatment optimizationadditive manufacturinglaser powder bed fusionnickel-based superalloyIN718high-temperature mechanical properties |
| spellingShingle | Eslam M. Fayed Mohammad Saadati Davood Shahriari Vladimir Brailovski Mohammad Jahazi Mamoun Medraj Optimization of the Post-Process Heat Treatment of Inconel 718 Superalloy Fabricated by Laser Powder Bed Fusion Process Metals heat treatment optimization additive manufacturing laser powder bed fusion nickel-based superalloy IN718 high-temperature mechanical properties |
| title | Optimization of the Post-Process Heat Treatment of Inconel 718 Superalloy Fabricated by Laser Powder Bed Fusion Process |
| title_full | Optimization of the Post-Process Heat Treatment of Inconel 718 Superalloy Fabricated by Laser Powder Bed Fusion Process |
| title_fullStr | Optimization of the Post-Process Heat Treatment of Inconel 718 Superalloy Fabricated by Laser Powder Bed Fusion Process |
| title_full_unstemmed | Optimization of the Post-Process Heat Treatment of Inconel 718 Superalloy Fabricated by Laser Powder Bed Fusion Process |
| title_short | Optimization of the Post-Process Heat Treatment of Inconel 718 Superalloy Fabricated by Laser Powder Bed Fusion Process |
| title_sort | optimization of the post process heat treatment of inconel 718 superalloy fabricated by laser powder bed fusion process |
| topic | heat treatment optimization additive manufacturing laser powder bed fusion nickel-based superalloy IN718 high-temperature mechanical properties |
| url | https://www.mdpi.com/2075-4701/11/1/144 |
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