Cell Structure in LPBF 316L—Microstructural Heterogeneity, Thermal Stability, and Mechanical Properties.
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| Title: | Cell Structure in LPBF 316L—Microstructural Heterogeneity, Thermal Stability, and Mechanical Properties. |
|---|---|
| Authors: | Barode, Jayant1 (AUTHOR) doje@dtu.dk, Brander, Marco1 (AUTHOR), Yu, Tianbo1 (AUTHOR), Nadimpalli, Venkata Karthik1 (AUTHOR), Jensen, Dorte Juul1 (AUTHOR) jayba@dtu.dk, Wang, Xiaobo1 (AUTHOR) jayba@dtu.dk |
| Source: | Materials (1996-1944). Feb2025, Vol. 18 Issue 3, p475. 12p. |
| Subjects: | Dislocation structure, Electron density, Dislocation density, Cell anatomy, Stainless steel |
| Abstract: | The microstructure of additively manufactured 316L stainless steel is hierarchical, and on a fine scale, it contains cell structures and dislocations. These microstructures define the mechanical properties, and it is thus of importance to quantify them and understand their thermal stability. This study investigates the heterogeneity of the microstructure in laser powder bed-fused 316L with a focus on variations in the cell and dislocation structures through the sample thickness along the build direction. While at the coarse scale the microstructure is rather homogeneous throughout its thickness, there are significant variations in the dislocation network, highlighting a higher dislocation density near the bottom layers than near the top. Furthermore, post-processing heat treatment at 500 °C and 800 °C reveals different stabilities of the cell structures, with significant cell dissolution at 800 °C, particularly at the top of the build. Microhardness measurements corroborate these findings, showing higher hardness in the bottom layers across all conditions, e.g., an increase in hardness from 225 HV to 236 HV is observed in the as-built condition. These results underpin the suggestion that significant microstructural heterogeneity may exist through the thickness in as-built parts, which affects the mechanical properties and subsequent heat treatments. [ABSTRACT FROM AUTHOR] |
| Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 182985787 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Cell Structure in LPBF 316L—Microstructural Heterogeneity, Thermal Stability, and Mechanical Properties. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Barode%2C+Jayant%22">Barode, Jayant</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> doje@dtu.dk</i><br /><searchLink fieldCode="AR" term="%22Brander%2C+Marco%22">Brander, Marco</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yu%2C+Tianbo%22">Yu, Tianbo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nadimpalli%2C+Venkata+Karthik%22">Nadimpalli, Venkata Karthik</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jensen%2C+Dorte+Juul%22">Jensen, Dorte Juul</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jayba@dtu.dk</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Xiaobo%22">Wang, Xiaobo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jayba@dtu.dk</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Feb2025, Vol. 18 Issue 3, p475. 12p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Dislocation+structure%22">Dislocation structure</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+density%22">Electron density</searchLink><br /><searchLink fieldCode="DE" term="%22Dislocation+density%22">Dislocation density</searchLink><br /><searchLink fieldCode="DE" term="%22Cell+anatomy%22">Cell anatomy</searchLink><br /><searchLink fieldCode="DE" term="%22Stainless+steel%22">Stainless steel</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The microstructure of additively manufactured 316L stainless steel is hierarchical, and on a fine scale, it contains cell structures and dislocations. These microstructures define the mechanical properties, and it is thus of importance to quantify them and understand their thermal stability. This study investigates the heterogeneity of the microstructure in laser powder bed-fused 316L with a focus on variations in the cell and dislocation structures through the sample thickness along the build direction. While at the coarse scale the microstructure is rather homogeneous throughout its thickness, there are significant variations in the dislocation network, highlighting a higher dislocation density near the bottom layers than near the top. Furthermore, post-processing heat treatment at 500 °C and 800 °C reveals different stabilities of the cell structures, with significant cell dissolution at 800 °C, particularly at the top of the build. Microhardness measurements corroborate these findings, showing higher hardness in the bottom layers across all conditions, e.g., an increase in hardness from 225 HV to 236 HV is observed in the as-built condition. These results underpin the suggestion that significant microstructural heterogeneity may exist through the thickness in as-built parts, which affects the mechanical properties and subsequent heat treatments. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/ma18030475 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 12 StartPage: 475 Subjects: – SubjectFull: Dislocation structure Type: general – SubjectFull: Electron density Type: general – SubjectFull: Dislocation density Type: general – SubjectFull: Cell anatomy Type: general – SubjectFull: Stainless steel Type: general Titles: – TitleFull: Cell Structure in LPBF 316L—Microstructural Heterogeneity, Thermal Stability, and Mechanical Properties. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Barode, Jayant – PersonEntity: Name: NameFull: Brander, Marco – PersonEntity: Name: NameFull: Yu, Tianbo – PersonEntity: Name: NameFull: Nadimpalli, Venkata Karthik – PersonEntity: Name: NameFull: Jensen, Dorte Juul – PersonEntity: Name: NameFull: Wang, Xiaobo IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 02 Text: Feb2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 19961944 Numbering: – Type: volume Value: 18 – Type: issue Value: 3 Titles: – TitleFull: Materials (1996-1944) Type: main |
| ResultId | 1 |
