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  <doc>
    <id>62816</id>
    <completedYear/>
    <publishedYear>2025</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>3949</pageFirst>
    <pageLast>3965</pageLast>
    <pageNumber/>
    <edition/>
    <issue>7-8</issue>
    <volume>137</volume>
    <type>article</type>
    <publisherName>Springer Science and Business Media LLC</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
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    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">On the transferability of post-processing heat treatments designed for PBF-LB IN718 alloys to directed energy deposition specimens</title>
    <abstract language="eng">Many processes are being developed for metal additive manufacturing (AM) which vary by their heat source and feedstock. The use of directed energy deposition (DED) is growing due to its ability to build larger structures outside of a contained powder bed chamber. However, the only standard exclusively for post-build heat treatment of AM IN718 is ASTM standard F3055-14a, developed for powder bed fusion (PBF). This study evaluates the applicability of this current heat treatment standard to AM IN718 specimens produced using two methods of DED: laser-blown powder (LP)-DED and arc-wire (AW)-DED. Electron microscopy and X-ray diffraction techniques were used to characterize the specimens in the as-built condition and after the full heat treatment (FHT) specified in F3055. No evidence of remaining Laves phase was observed in the two DED specimens after the FHT. Yield strengths for the DED specimens were 1049 MPa for FHT AW-DED and 1096 MPa for LP-DED, higher than the minimum stated for PBF-LB IN718 of 920 MPa. The size, morphology, inter-spacing, and diffraction patterns of the γ´ and γ´´ strengthening precipitates are found to be similar for both DED processes. Differences were observed in the microstructure evolution where the F3055 heat treatments resulted in partial recrystallization of the grain structure, with a higher content of annealing twins observed in the AW-DED. These microstructural differences correlate with differences in the resulting elongation to failure. Thus, it is proposed that variations in heat treatments are needed for optimizing IN718 produced by different AM processes.</abstract>
    <parentTitle language="eng">The International Journal of Advanced Manufacturing Technology</parentTitle>
    <identifier type="doi">10.1007/s00170-025-15386-1</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-628165</identifier>
    <identifier type="issn">1433-3015</identifier>
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    <enrichment key="date_peer_review">30.06.2025</enrichment>
    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Itziar Serrano-Munoz</author>
    <author>Leonardo Agudo Jácome</author>
    <author>Sean Thompsom</author>
    <author>Judy Schneider</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Additive manufacturing variants</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Directed energy deposition (DED)</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Post-process heat treatments</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>SEM-EBSD and TEM microscopy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>XRD phase analysis</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">5 Werkstofftechnik</collection>
    <collection role="institutes" number="">5.1 Mikrostruktur Design und Degradation</collection>
    <collection role="institutes" number="">8 Zerstörungsfreie Prüfung</collection>
    <collection role="institutes" number="">8.5 Röntgenbildgebung</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei für die Öffentlichkeit verfügbar ("Open Access")</collection>
    <collection role="unnumberedseries" number="">Wissenschaftliche Artikel der BAM</collection>
    <collection role="themenfelder" number="">Additive Fertigung</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-bam/files/62816/Serrano_Munoz_with_J_Schneider_and_L_Agudo.pdf</file>
  </doc>
  <doc>
    <id>65095</id>
    <completedYear/>
    <publishedYear>2026</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>593</pageFirst>
    <pageLast>608</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>41</volume>
    <type>article</type>
    <publisherName>Elsevier B.V.</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
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    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">The impact of scanning strategy on cell structures in PBF-LB/M/IN718: an in situ synchrotron x-ray diffraction study</title>
    <abstract language="eng">In additive manufacturing, any change of the process parameters, such as scanning strategy, directly affects the cooling rates, heat accumulation, and overall thermal history of the build. Consequently, parts built with different process parameters tend to have different levels of crystallographic texture, residual stress, and dislocation density. These features can influence the properties of the material and their development during post-processing operations. In this study, IN718 prisms were built by laser powder bed fusion (PBF-LB/M) using two different scanning strategies (continuous 67° rotations around the build direction, ROT, and alternating 0°/67° scans, ALT) to provide two different as-built conditions. In situ time-resolved synchrotron diffraction was performed during a solution heat treatment at 1027 °C for 1 h. Ex situ scanning electron microscopy was used to support and complement the in situ observations. An approach to quantify the effect of elemental microsegregation at the cell walls is developed based on the deconvolution of asymmetric γ-nickel matrix peaks. Following this approach, the scanning strategies are shown to affect the as-built fraction of cell walls in the material, resulting in a difference of approximately 5 %, in weight fraction, between ROT and ALT (19 % vs. 24 %, respectively). This microsegregation was observed to be rapidly homogenized during the heating ramp, and no significant changes to the peak shape in the γ peaks occurred during the isothermal part of the heat treatment, regardless of the scanning strategy.</abstract>
    <parentTitle language="eng">Journal of Materials Research and Technology</parentTitle>
    <identifier type="issn">2238-7854</identifier>
    <identifier type="doi">10.1016/j.jmrt.2025.11.214</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-650958</identifier>
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    <enrichment key="date_peer_review">29.12.2025</enrichment>
    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Bruno Ferrari</author>
    <author>Andrea Fantin</author>
    <author>D. Said</author>
    <author>A. N. Fitch</author>
    <author>Patricia Suárez Ocano</author>
    <author>Tatiana Mishurova</author>
    <author>Ilaria Roveda</author>
    <author>Arne Kromm</author>
    <author>Reza Darvishi Kamachali</author>
    <author>Giovanni Bruno</author>
    <author>Alexander Evans</author>
    <author>G. Requena</author>
    <author>Leonardo Agudo Jácome</author>
    <author>Itziar Serrano Munoz</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Additive manufacturing</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Inconel 718</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Synchrotron x-ray diffraction</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Heat treatment</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Laser powder bed fusion</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Cellular microstructure</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">5 Werkstofftechnik</collection>
    <collection role="institutes" number="">5.1 Mikrostruktur Design und Degradation</collection>
    <collection role="institutes" number="">5.2 Metallische Hochtemperaturwerkstoffe</collection>
    <collection role="institutes" number="">5.5 Materialmodellierung</collection>
    <collection role="institutes" number="">8 Zerstörungsfreie Prüfung</collection>
    <collection role="institutes" number="">8.5 Röntgenbildgebung</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
    <collection role="institutes" number="">9.4 Integrität von Schweißverbindungen</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei für die Öffentlichkeit verfügbar ("Open Access")</collection>
    <collection role="unnumberedseries" number="">Wissenschaftliche Artikel der BAM</collection>
    <collection role="institutes" number="">5.0 Abteilungsleitung und andere</collection>
    <collection role="themenfelder" number="">Additive Fertigung</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-bam/files/65095/Ferrari_impact_of_scanning_stratgy_on_cell_structures.pdf</file>
  </doc>
  <doc>
    <id>59931</id>
    <completedYear/>
    <publishedYear>2024</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>17</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>article</type>
    <publisherName>Wiley</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Tensile and Low‐Cycle Fatigue Behavior of Laser Powder Bed Fused Inconel 718 at Room and High Temperature</title>
    <abstract language="eng">This study investigates the room‐ and high‐temperature (650 °C) tensile and low‐cycle‐fatigue behavior of Inconel 718 produced by laser powder bed fusion (PBF‐LB/M) with a four‐step heat treatment and compares the results to the conventional wrought material. The microstructure after heat treatment is characterized on different length scales. Compared to the wrought variant, the elastic and yield properties are comparable at both test temperatures while tensile strength, ductility, and strain hardening capacity are lower. The fatigue life of the PBF‐LB/M variant at room temperature is slightly lower than that of the wrought material, while at 650 °C, it is vice versa. The cyclic stress response for both material variants is characterized by cyclic softening, which is more pronounced at the higher test temperature. High strain amplitudes (≥0.7%) at room temperature and especially a high testing temperature result in the formation of multiple secondary cracks at the transitions of regions comprising predominantly elongated grain morphology and columns of stacked grains with ripple patterns in the PBF‐LB/M material. This observation and pronounced crack branching and deflection indicate that the cracks are controlled by sharp micromechanical gradients and local crystallite clusters.</abstract>
    <parentTitle language="eng">Advanced Engineering Materials</parentTitle>
    <identifier type="doi">10.1002/adem.202302122</identifier>
    <identifier type="issn">1527-2648</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-599316</identifier>
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The microstructure after heat treatment is characterized on different length scales. Compared to the wrought variant, the elastic and yield properties are comparable at both test temperatures while tensile strength, ductility, and strain hardening capacity are lower. The fatigue life of the PBF\u2010LB\/M variant at room temperature is slightly lower than that of the wrought material, while at 650\u2009\u00b0C, it is vice versa. The cyclic stress response for both material variants is characterized by cyclic softening, which is more pronounced at the higher test temperature. High strain amplitudes (\u22650.7%) at room temperature and especially a high testing temperature result in the formation of multiple secondary cracks at the transitions of regions comprising predominantly elongated grain morphology and columns of stacked grains with ripple patterns in the PBF\u2010LB\/M material. This observation and pronounced crack branching and deflection indicate that the cracks are controlled by sharp micromechanical gradients and local  crystallite clusters.&lt;\/jats:p&gt;","DOI":"10.1002\/adem.202302122","type":"journal-article","created":{"date-parts":[[2024,2,3]],"date-time":"2024-02-03T02:39:35Z","timestamp":1706927975000},"update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Tensile and Low\u2010Cycle Fatigue Behavior of Laser Powder Bed Fused Inconel 718 at Room and High Temperature"],"prefix":"10.1002","author":[{"ORCID":"http:\/\/orcid.org\/0000-0002-9115-5475","authenticated-orcid":false,"given":"Nadja","family":"Sonntag","sequence":"first","affiliation":[{"name":"Materials Engineering Bundesanstalt f\u00fcr Materialforschung und \u2013pr\u00fcfung (BAM)  Unter den Eichen 87 Berlin 12205 Germany"}]},{"given":"Benjamin","family":"Piesker","sequence":"additional","affiliation":[{"name":"Materials Engineering Bundesanstalt f\u00fcr Materialforschung und \u2013pr\u00fcfung (BAM)  Unter den Eichen 87 Berlin 12205 Germany"}]},{"ORCID":"http:\/\/orcid.org\/0000-0003-0012-2414","authenticated-orcid":false,"given":"Luis Alexander","family":"\u00c1vila Calder\u00f3n","sequence":"additional","affiliation":[{"name":"Materials Engineering Bundesanstalt f\u00fcr Materialforschung und \u2013pr\u00fcfung (BAM)  Unter den Eichen 87 Berlin 12205 Germany"}]},{"ORCID":"http:\/\/orcid.org\/0009-0009-9763-9137","authenticated-orcid":false,"given":"Gunther","family":"Mohr","sequence":"additional","affiliation":[{"name":"Component Safety Bundesanstalt f\u00fcr Materialforschung und \u2013pr\u00fcfung (BAM)  Unter den Eichen 87 Berlin 12205 Germany"}]},{"ORCID":"http:\/\/orcid.org\/0000-0002-9189-1595","authenticated-orcid":false,"given":"Birgit","family":"Rehmer","sequence":"additional","affiliation":[{"name":"Materials Engineering Bundesanstalt f\u00fcr Materialforschung und \u2013pr\u00fcfung (BAM)  Unter den Eichen 87 Berlin 12205 Germany"}]},{"ORCID":"http:\/\/orcid.org\/0000-0001-8839-8815","authenticated-orcid":false,"given":"Leonardo","family":"Agudo J\u00e1come","sequence":"additional","affiliation":[{"name":"Materials Engineering Bundesanstalt f\u00fcr Materialforschung und \u2013pr\u00fcfung (BAM)  Unter den Eichen 87 Berlin 12205 Germany"}]},{"ORCID":"http:\/\/orcid.org\/0000-0001-8875-6547","authenticated-orcid":false,"given":"Kai","family":"Hilgenberg","sequence":"additional","affiliation":[{"name":"Component Safety Bundesanstalt f\u00fcr Materialforschung und \u2013pr\u00fcfung (BAM)  Unter den Eichen 87 Berlin 12205 Germany"}]},{"ORCID":"http:\/\/orcid.org\/0000-0002-0365-8639","authenticated-orcid":false,"given":"Alexander","family":"Evans","sequence":"additional","affiliation":[{"name":"Non\u2010Destructive Testing Bundesanstalt f\u00fcr Materialforschung und \u2013pr\u00fcfung (BAM)  Unter den Eichen 87 Berlin 12205 Germany"}]},{"ORCID":"http:\/\/orcid.org\/0000-0003-0727-5499","authenticated-orcid":false,"given":"Birgit","family":"Skrotzki","sequence":"additional","affiliation":[{"name":"Materials Engineering Bundesanstalt f\u00fcr Materialforschung und \u2013pr\u00fcfung (BAM)  Unter den Eichen 87 Berlin 12205 Germany"}]}],"member":"311","published-online":{"date-parts":[[2024,4,17]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-319-58205-4"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.actamat.2021.117240"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pmatsci.2017.10.001"},{"key":"e_1_2_8_5_1","unstructured":"B.Merz K.Poka R.Nilsson G.Mohr K.Hilgenberg in Lasers in Manufacturing (LiM) 2023 WLT 1."},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.mser.2020.100596"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pmatsci.2022.101051"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.msea.2016.05.089"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.matchar.2019.01.028"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pmatsci.2023.101108"},{"key":"e_1_2_8_11_1","first-page":"20","volume":"6","author":"Schneider J.","year":"2022","journal-title":"J. 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    <author>Nadja Sonntag</author>
    <author>Benjamin Piesker</author>
    <author>Luis Ávila Calderón</author>
    <author>Gunther Mohr</author>
    <author>Birgit Rehmer</author>
    <author>Leonardo Agudo Jácome</author>
    <author>Kai Hilgenberg</author>
    <author>Alexander Evans</author>
    <author>Birgit Skrotzki</author>
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      <value>Additive manufacturing</value>
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      <value>Inconel 718</value>
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      <language>eng</language>
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      <value>Laser powder bed fusion</value>
    </subject>
    <subject>
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      <type>uncontrolled</type>
      <value>Low-cycle fatigue</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Tensile strength</value>
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    <pageFirst>142223</pageFirst>
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    <title language="eng">Creep and creep damage behavior of stainless steel 316L manufactured by laser powder bed fusion</title>
    <abstract language="eng">This study presents a thorough characterization of the creep properties of austenitic stainless steel 316L produced by laser powder bed fusion (LPBF 316L) contributing to the sparse available data to date. Experimental results (mechanical tests, microscopy, X-ray computed tomography) concerning the creep deformation and damage mechanisms are presented and discussed. The tested LPBF material exhibits a low defect population, which allows for the isolation and improved understanding of the effect of other typical aspects of an LPBF microstructure on the creep behavior. As a benchmark to assess the material properties of the LPBF 316L, a conventionally manufactured variant of 316L was also tested. To characterize the creep properties, hot tensile tests and constant force creep tests at 600 °C and 650 °C are performed. The creep stress exponents of the LPBF material are smaller than that of the conventional variant. The primary and secondary creep stages and the times to rupture of the LPBF material are shorter than the hot rolled 316L. Overall the creep damage is more extensive in the LPBF material. The creep damage of the LPBF material is overall mainly intergranular. It is presumably caused and accelerated by both the appearance of precipitates at the grain boundaries and the unfavorable orientation of the grain boundaries. Neither the melt pool boundaries nor entrapped gas pores show a significant influence on the creep damage mechanism.</abstract>
    <parentTitle language="eng">Materials Science and Engineering: A</parentTitle>
    <identifier type="issn">0921-5093</identifier>
    <identifier type="doi">10.1016/j.msea.2021.142223</identifier>
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    <enrichment key="date_peer_review">16.12.2021</enrichment>
    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Luis Ávila Calderón</author>
    <author>Birgit Rehmer</author>
    <author>Sina Schriever</author>
    <author>Alexander Ulbricht</author>
    <author>Leonardo Agudo Jácome</author>
    <author>Konstantin Sommer</author>
    <author>Gunther Mohr</author>
    <author>Birgit Skrotzki</author>
    <author>Alexander Evans</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>316L</value>
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    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Laser Powder Bed Fusion (LPBF)</value>
    </subject>
    <subject>
      <language>eng</language>
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      <value>Creep behavior</value>
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    <subject>
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      <value>Additive Manufacturing</value>
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    <subject>
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      <type>uncontrolled</type>
      <value>AGIL</value>
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    <collection role="institutes" number="">5.2 Metallische Hochtemperaturwerkstoffe</collection>
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    <collection role="institutes" number="">9.6 Additive Fertigung metallischer Komponenten</collection>
    <collection role="themenfelder" number="">Additive Fertigung</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
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    <publishedYear>2025</publishedYear>
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    <pageFirst>1</pageFirst>
    <pageLast>24</pageLast>
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    <issue/>
    <volume>939</volume>
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    <title language="eng">Effect of 700–900 °C heat treatments and room and high temperature tensile deformation on the microstructure of laser powder bed fused 316L stainless steel</title>
    <abstract language="eng">The effect of post-processing heat treatments on the hierarchical microstructure evolution and mechanical strength of the austenitic stainless steel 316L produced by laser powder bed fusion has been investigated. Heat treatments between 700 and 900 ◦C and 0.5 to 3 h, were applied to samples treated at 450 ◦C for 4 h. The results showed a stable microstructure at all studied temperatures and times in terms of grain size, morphology, aspect ratio, density of low-angle grain boundaries, and texture. However, temperature and time promoted the diffusion of segregated elements together with a reduction in dislocation density and disappearance of the cellular structure. This was associated with a reduction in hardness and tensile proof strength at both room and high temperature. In addition, microstructural characterization coupled with thermodynamic CALPHAD-based equilibrium calculations showed that the formation of carbides and intermetallic phases was already visible after annealing at 800 ◦C for 3 hours, although these intermetallics did not affect the tensile properties at this level. Analysis of the microstructure evolution after tensile deformation showed differences in the deformation mechanisms at room and high temperature, with twinning and martensitic transformation occurring at room temperature, the latter not widely reported for additively manufactured 316L. Finally, comparisons with similar materials produced under comparable conditions showed differences in the tensile properties, attributed to differences in chemical composition and the associated presence of stacking faults in the undeformed state.</abstract>
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    <identifier type="doi">10.1016/j.msea.2025.148469</identifier>
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    <author>Patricia Suárez Ocaño</author>
    <author>Luis Ávila Calderón</author>
    <author>Leonardo Agudo Jácome</author>
    <author>Birgit Rehmer</author>
    <author>Gunther Mohr</author>
    <author>Alexander Evans</author>
    <author>Birgit Skrotzki</author>
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      <value>Additive manufacturing</value>
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      <value>316L stainless steel</value>
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    <subject>
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      <type>uncontrolled</type>
      <value>Heat treatments</value>
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    <subject>
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      <value>Tensile properties</value>
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    <subject>
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      <value>Microstructure</value>
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    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">5 Werkstofftechnik</collection>
    <collection role="institutes" number="">5.1 Mikrostruktur Design und Degradation</collection>
    <collection role="institutes" number="">5.2 Metallische Hochtemperaturwerkstoffe</collection>
    <collection role="institutes" number="">8 Zerstörungsfreie Prüfung</collection>
    <collection role="institutes" number="">8.5 Röntgenbildgebung</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei für die Öffentlichkeit verfügbar ("Open Access")</collection>
    <collection role="unnumberedseries" number="">Wissenschaftliche Artikel der BAM</collection>
    <collection role="institutes" number="">9.6 Additive Fertigung metallischer Komponenten</collection>
    <collection role="themenfelder" number="">Additive Fertigung</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-bam/files/63247/1-s2.0-S0921509325006938-main.pdf</file>
    <file>https://opus4.kobv.de/opus4-bam/files/63247/Supplementary Material_P1_.pdf</file>
  </doc>
  <doc>
    <id>64354</id>
    <completedYear/>
    <publishedYear>2025</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>lecture</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
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    <title language="eng">Low-Cycle Fatigue Behavior of Laser Powder Bed Fused Inconel 718 at Room and High Temperature</title>
    <abstract language="eng">The nickel-base superalloy Inconel 718 (IN718) is one of the most commonly used Ni-based superalloys for high temperature structural applications for its remarkable strength, as well as creep, fatigue, and corrosion resistance up to 650 °C. While IN718 has traditionally been employed as cast or wrought material, it is difficult to machine because of its high strength and toughness. The additive manufacturing of IN718 components made by metal AM has thus gained extensive attention to produce expensive near-net shaped components of high-temperature alloys such as IN718, for it saves material and costs in processing and machining steps. Among all metal additive manufacturing (AM) technologies, laser powder bed fusion (PBF-LB/M) is the most widespread, IN718 being one of the most common alloys produced with it. However, high cooling rates associated to the PBF-LB/M process, hinders the primary strengthening phases γ’’ and γ’ to form, as these cooling rates induce a dislocation cellular substructure, at which walls primary Laves phases bind segregating Nb, Ti and Mo. Many of the therefore needed heat-treatment strategies can then promote Laves-phase transformation into the stable δ phase along the cell and grain boundaries. Laves and δ phases, as well as grain-boundary primary carbides may have adverse effects on mechanical properties. The mostly needle-shaped δ phase was namely found to have a detrimental effect on creep rupture life while no direct effect on LCF fatigue life was evident. In this work room- and high-temperature (650 °C) low-cycle fatigue behavior of PBF-LB/M IN718 is investigated in the four-step heat-treated state and compared to wrought IN718. The microstructure of both materials is characterized across length scales via microscopy methods. The fatigue life at room temperature of the PBF-LB/M IN718 material is slightly lower than that for the wrought material, which is reversed at 650 °C. The cyclic stress response for both materials is marked by cyclic softening that is more pronounced at higher test temperatures. Multiple secondary cracks form at high strain amplitudes, at both room and high temperatures. High testing temperatures enhance specially crack formation at the transitions of regions between elongated grains and columns of stacked grains with ripple patterns in the PBF-LB/M material. Additional to this behavior, pronounced crack branching and deflection indicate that the cracks are controlled by sharp micromechanical gradients.</abstract>
    <enrichment key="eventName">EUROMAT 2025</enrichment>
    <enrichment key="eventPlace">Granada, Spain</enrichment>
    <enrichment key="eventStart">14.09.2025</enrichment>
    <enrichment key="eventEnd">18.09.2025</enrichment>
    <enrichment key="InvitedTalks">0</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <author>Leonardo Agudo Jácome</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Additive manufacturing</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Low-cycle fatigue</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Microstructural characterization</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Ni-base superalloy</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">5 Werkstofftechnik</collection>
    <collection role="institutes" number="">5.1 Mikrostruktur Design und Degradation</collection>
    <collection role="institutes" number="">5.2 Metallische Hochtemperaturwerkstoffe</collection>
    <collection role="institutes" number="">8 Zerstörungsfreie Prüfung</collection>
    <collection role="institutes" number="">8.5 Röntgenbildgebung</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="themenfelder" number="">Degradationsmechanismen</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="literaturgattung" number="">Präsentation</collection>
    <collection role="institutes" number="">9.6 Additive Fertigung metallischer Komponenten</collection>
    <collection role="themenfelder" number="">Additive Fertigung</collection>
  </doc>
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