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Residual stresses and distortions in additive manufactured Inconel 718.

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Title: Residual stresses and distortions in additive manufactured Inconel 718.
Authors: Gullipalli, Chaitanya1 (AUTHOR), Thawari, Nikhil1 (AUTHOR), Burad, Prayag1 (AUTHOR), Gupta, T V K1 (AUTHOR) tvkgupta@mec.vnit.ac.in
Source: Materials & Manufacturing Processes. 2023, Vol. 38 Issue 12, p1549-1560. 12p.
Subjects: Residual stresses, Ultimate strength, Thermal strain, Temperature measurements, Hardness
Abstract: Direct energy deposition is an additive manufacturing technique, follows layer-wise deposition to avail design freedom and minimizes material wastage. Despite the unique advantages, repeated heating and cooling induces thermal strains in the components. The present investigation is to understand the thermal-induced distortions and residual stresses in Inconel 718 components fabricated through direct energy deposition. The distortions and temperature measurements are carried out in situ and residual stresses are measured using micro-indentation technique. The distortions are increasing with number of layers, and the distortion rate is varying along the height of deposition. The temperature data indicated rapid heating and cooling. The residual stresses measured are compressive in nature, and are approximately 40% of yield strength in magnitude. The ultimate strength, yield strengths are 800 ± 30 MPa, 580 ± 50 MPa respectively, and maximum hardness obtained is 349 HV. Microstructure Characterizations showed continuous growth of columnar dendrites through multiple layers, and Nb segregation at interdendrites. [ABSTRACT FROM AUTHOR]
Copyright of Materials & Manufacturing Processes is the property of Taylor & Francis Ltd 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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  Data: Residual stresses and distortions in additive manufactured Inconel 718.
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  Data: <searchLink fieldCode="JN" term="%22Materials+%26+Manufacturing+Processes%22">Materials & Manufacturing Processes</searchLink>. 2023, Vol. 38 Issue 12, p1549-1560. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Residual+stresses%22">Residual stresses</searchLink><br /><searchLink fieldCode="DE" term="%22Ultimate+strength%22">Ultimate strength</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+strain%22">Thermal strain</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+measurements%22">Temperature measurements</searchLink><br /><searchLink fieldCode="DE" term="%22Hardness%22">Hardness</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Direct energy deposition is an additive manufacturing technique, follows layer-wise deposition to avail design freedom and minimizes material wastage. Despite the unique advantages, repeated heating and cooling induces thermal strains in the components. The present investigation is to understand the thermal-induced distortions and residual stresses in Inconel 718 components fabricated through direct energy deposition. The distortions and temperature measurements are carried out in situ and residual stresses are measured using micro-indentation technique. The distortions are increasing with number of layers, and the distortion rate is varying along the height of deposition. The temperature data indicated rapid heating and cooling. The residual stresses measured are compressive in nature, and are approximately 40% of yield strength in magnitude. The ultimate strength, yield strengths are 800 ± 30 MPa, 580 ± 50 MPa respectively, and maximum hardness obtained is 349 HV. Microstructure Characterizations showed continuous growth of columnar dendrites through multiple layers, and Nb segregation at interdendrites. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials & Manufacturing Processes is the property of Taylor & Francis Ltd 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: 10.1080/10426914.2023.2165663
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      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 1549
    Subjects:
      – SubjectFull: Residual stresses
        Type: general
      – SubjectFull: Ultimate strength
        Type: general
      – SubjectFull: Thermal strain
        Type: general
      – SubjectFull: Temperature measurements
        Type: general
      – SubjectFull: Hardness
        Type: general
    Titles:
      – TitleFull: Residual stresses and distortions in additive manufactured Inconel 718.
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            NameFull: Gullipalli, Chaitanya
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            NameFull: Thawari, Nikhil
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            NameFull: Burad, Prayag
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            NameFull: Gupta, T V K
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          Dates:
            – D: 01
              M: 09
              Text: 2023
              Type: published
              Y: 2023
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              Value: 38
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              Value: 12
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            – TitleFull: Materials & Manufacturing Processes
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