View in EDS HTML Full Text PDF Full Text

Effect of substrate preheating on the microstructure and hardness of Haynes 25 alloys prepared by laser-directed energy deposition.

Saved in:
Bibliographic Details
Title: Effect of substrate preheating on the microstructure and hardness of Haynes 25 alloys prepared by laser-directed energy deposition.
Authors: Joo, SeungHo1,2 (AUTHOR), Suh, Joowon1,3 (AUTHOR), Chun, Young-Bum1 (AUTHOR), Han, Heung Nam3 (AUTHOR), Kang, Suk Hoon1 (AUTHOR) shkang77@kaeri.re.kr
Source: Powder Metallurgy. Aug2025, Vol. 68 Issue 4, p320-332. 13p.
Subjects: Nuclear reactors, Dislocation density, Nuclear energy, Substrates (Materials science), Wear resistance
Abstract: Improving wear resistance in Haynes 25 alloy is crucial for the development of flexible nuclear power reactors. Herein, laser-directed energy deposition (L-DED)-assisted substrate preheating is reported as an efficient strategy to alleviate cracks and pores in the alloy. The substrate-preheated alloy (300PH) exhibited no microcracks and a 45.2% reduction in pore fraction compared to the non-preheated alloy (NonPH). Moreover, 300PH exhibited a 7% lower Vickers microhardness than that of NonPH, whereas its nanohardness decreased by 3.6 and 2.9% in the dendritic and interdendritic regions, respectively. Dislocation strengthening was the dominant contributor to the theoretical yield strength and microhardness. Furthermore, preheating influenced the dislocation contribution substantially by reducing the residual stress leading to reductions in geometrically necessary dislocations and total dislocation density, thereby reducing microhardness. Therefore, preheating the substrate mitigated pores and cracks, effectively improved the structural integrity of L-DED Haynes 25 alloy, without significantly compromising the hardness. [ABSTRACT FROM AUTHOR]
Copyright of Powder Metallurgy is the property of Sage Publications Inc. 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
Full text is not displayed to guests.
FullText Links:
  – Type: pdflink
Text:
  Availability: 1
Header DbId: egs
DbLabel: Engineering Source
An: 186912451
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Effect of substrate preheating on the microstructure and hardness of Haynes 25 alloys prepared by laser-directed energy deposition.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Joo%2C+SeungHo%22">Joo, SeungHo</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Suh%2C+Joowon%22">Suh, Joowon</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chun%2C+Young-Bum%22">Chun, Young-Bum</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Han%2C+Heung+Nam%22">Han, Heung Nam</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kang%2C+Suk+Hoon%22">Kang, Suk Hoon</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> shkang77@kaeri.re.kr</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Powder+Metallurgy%22">Powder Metallurgy</searchLink>. Aug2025, Vol. 68 Issue 4, p320-332. 13p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Nuclear+reactors%22">Nuclear reactors</searchLink><br /><searchLink fieldCode="DE" term="%22Dislocation+density%22">Dislocation density</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+energy%22">Nuclear energy</searchLink><br /><searchLink fieldCode="DE" term="%22Substrates+%28Materials+science%29%22">Substrates (Materials science)</searchLink><br /><searchLink fieldCode="DE" term="%22Wear+resistance%22">Wear resistance</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Improving wear resistance in Haynes 25 alloy is crucial for the development of flexible nuclear power reactors. Herein, laser-directed energy deposition (L-DED)-assisted substrate preheating is reported as an efficient strategy to alleviate cracks and pores in the alloy. The substrate-preheated alloy (300PH) exhibited no microcracks and a 45.2% reduction in pore fraction compared to the non-preheated alloy (NonPH). Moreover, 300PH exhibited a 7% lower Vickers microhardness than that of NonPH, whereas its nanohardness decreased by 3.6 and 2.9% in the dendritic and interdendritic regions, respectively. Dislocation strengthening was the dominant contributor to the theoretical yield strength and microhardness. Furthermore, preheating influenced the dislocation contribution substantially by reducing the residual stress leading to reductions in geometrically necessary dislocations and total dislocation density, thereby reducing microhardness. Therefore, preheating the substrate mitigated pores and cracks, effectively improved the structural integrity of L-DED Haynes 25 alloy, without significantly compromising the hardness. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Powder Metallurgy is the property of Sage Publications Inc. 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.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=186912451
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1177/00325899251343440
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 13
        StartPage: 320
    Subjects:
      – SubjectFull: Nuclear reactors
        Type: general
      – SubjectFull: Dislocation density
        Type: general
      – SubjectFull: Nuclear energy
        Type: general
      – SubjectFull: Substrates (Materials science)
        Type: general
      – SubjectFull: Wear resistance
        Type: general
    Titles:
      – TitleFull: Effect of substrate preheating on the microstructure and hardness of Haynes 25 alloys prepared by laser-directed energy deposition.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Joo, SeungHo
      – PersonEntity:
          Name:
            NameFull: Suh, Joowon
      – PersonEntity:
          Name:
            NameFull: Chun, Young-Bum
      – PersonEntity:
          Name:
            NameFull: Han, Heung Nam
      – PersonEntity:
          Name:
            NameFull: Kang, Suk Hoon
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 08
              Text: Aug2025
              Type: published
              Y: 2025
          Identifiers:
            – Type: issn-print
              Value: 00325899
          Numbering:
            – Type: volume
              Value: 68
            – Type: issue
              Value: 4
          Titles:
            – TitleFull: Powder Metallurgy
              Type: main
ResultId 1