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Microstructure Evolution and Solute Segregation of Inconel 718 in Laser Additive Manufacturing: A Numerical and Experimental Investigation.

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Title: Microstructure Evolution and Solute Segregation of Inconel 718 in Laser Additive Manufacturing: A Numerical and Experimental Investigation.
Authors: Liu, Hang1 (AUTHOR), Xiao, Wenjia1,2 (AUTHOR) gdxwj@fosu.edu.cn, Yan, Baolin1 (AUTHOR), Xiao, Hui1 (AUTHOR)
Source: Materials (1996-1944). Apr2026, Vol. 19 Issue 8, p1642. 19p.
Subjects: Laves phases (Metallurgy), Inconel, Microstructure, Empirical research, Computer simulation, Concentration gradient, Heat resistant alloys, Selective laser melting
Abstract: The segregation of brittle Laves phases remains a critical bottleneck limiting the performance of additive manufacturing (AM) nickel-based superalloys. While its evolution is governed by complex transient physical fields within the melt pool, a quantitative kinetic correlation between processing parameters and microstructural features is currently lacking. In this study, a high-fidelity multiphysics numerical model was developed to establish a cross-scale mapping logic of "Process-Physical Field-Microstructure" by dissecting the global distribution of temperature gradient (G) and solidification rate (R) along the quasi-steady-state melt pool boundary. It is revealed that increasing the scanning speed synergistically enhances R while compressing G. Beyond driving a transition from oriented columnar dendrites to refined mixed-dendritic structures, this shift effectively blocks the continuous enrichment channels of Nb and Mo elements by compressing the "kinetic time window" for solute redistribution. Consequently, the morphology of the Laves phase is forced to evolve from a continuous interconnected chain-like network into dispersed isolated particles. This research clarifies the kinetic essence of microstructural evolution under non-equilibrium solidification, providing critical physical criteria for the precise intervention of deleterious phases and the regulation of microstructural consistency in high-performance AM components. [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.)
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Header DbId: egs
DbLabel: Engineering Source
An: 193436311
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PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Microstructure Evolution and Solute Segregation of Inconel 718 in Laser Additive Manufacturing: A Numerical and Experimental Investigation.
– Name: Author
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  Data: <searchLink fieldCode="AR" term="%22Liu%2C+Hang%22">Liu, Hang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xiao%2C+Wenjia%22">Xiao, Wenjia</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> gdxwj@fosu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Yan%2C+Baolin%22">Yan, Baolin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xiao%2C+Hui%22">Xiao, Hui</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Apr2026, Vol. 19 Issue 8, p1642. 19p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Laves+phases+%28Metallurgy%29%22">Laves phases (Metallurgy)</searchLink><br /><searchLink fieldCode="DE" term="%22Inconel%22">Inconel</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Empirical+research%22">Empirical research</searchLink><br /><searchLink fieldCode="DE" term="%22Computer+simulation%22">Computer simulation</searchLink><br /><searchLink fieldCode="DE" term="%22Concentration+gradient%22">Concentration gradient</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+resistant+alloys%22">Heat resistant alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Selective+laser+melting%22">Selective laser melting</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The segregation of brittle Laves phases remains a critical bottleneck limiting the performance of additive manufacturing (AM) nickel-based superalloys. While its evolution is governed by complex transient physical fields within the melt pool, a quantitative kinetic correlation between processing parameters and microstructural features is currently lacking. In this study, a high-fidelity multiphysics numerical model was developed to establish a cross-scale mapping logic of "Process-Physical Field-Microstructure" by dissecting the global distribution of temperature gradient (G) and solidification rate (R) along the quasi-steady-state melt pool boundary. It is revealed that increasing the scanning speed synergistically enhances R while compressing G. Beyond driving a transition from oriented columnar dendrites to refined mixed-dendritic structures, this shift effectively blocks the continuous enrichment channels of Nb and Mo elements by compressing the "kinetic time window" for solute redistribution. Consequently, the morphology of the Laves phase is forced to evolve from a continuous interconnected chain-like network into dispersed isolated particles. This research clarifies the kinetic essence of microstructural evolution under non-equilibrium solidification, providing critical physical criteria for the precise intervention of deleterious phases and the regulation of microstructural consistency in high-performance AM components. [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:
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    Identifiers:
      – Type: doi
        Value: 10.3390/ma19081642
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 19
        StartPage: 1642
    Subjects:
      – SubjectFull: Laves phases (Metallurgy)
        Type: general
      – SubjectFull: Inconel
        Type: general
      – SubjectFull: Microstructure
        Type: general
      – SubjectFull: Empirical research
        Type: general
      – SubjectFull: Computer simulation
        Type: general
      – SubjectFull: Concentration gradient
        Type: general
      – SubjectFull: Heat resistant alloys
        Type: general
      – SubjectFull: Selective laser melting
        Type: general
    Titles:
      – TitleFull: Microstructure Evolution and Solute Segregation of Inconel 718 in Laser Additive Manufacturing: A Numerical and Experimental Investigation.
        Type: main
  BibRelationships:
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      – PersonEntity:
          Name:
            NameFull: Liu, Hang
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          Name:
            NameFull: Xiao, Wenjia
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            NameFull: Yan, Baolin
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            NameFull: Xiao, Hui
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            – D: 15
              M: 04
              Text: Apr2026
              Type: published
              Y: 2026
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              Value: 19
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              Value: 8
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            – TitleFull: Materials (1996-1944)
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