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    <title language="deu">Prozessentwicklung zur Herstellung von Keramiksensoren</title>
    <abstract language="deu">In diesem Vortrag wurde die zerspanende Fertigung von Federkomponenten aus Hochleistungskeramiken mithilfe von Ultraschallunterstützung an der BAM vorgestellt.</abstract>
    <enrichment key="eventName">2. Wissenschaftliches Forum zur Ultrasonic-Bearbeitung</enrichment>
    <enrichment key="eventPlace">Jena, Germany</enrichment>
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    <author>Andreas Börner</author>
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      <language>deu</language>
      <type>uncontrolled</type>
      <value>Keramikbearbeitung</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Ultraschallunterstütztes Schleifen</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Keramikfeder</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Präzesionssensoren</value>
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    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
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    <publishedYear>2022</publishedYear>
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    <issue/>
    <volume>108</volume>
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    <title language="eng">Ultrasonic assisted milling of a CoCrFeNi medium entropy alloy</title>
    <abstract language="eng">Medium and High Entropy Alloys (MEA/HEA) are recently developed material classes, providing manifold applications, e.g., due to extraordinary structural properties. In that connection, the machinability as important issue for the processing of these materials was not in the scientific focus. This study focusses on experimental analysis of milling process conditions including ultrasonic assisted milling (USAM) and their effects on the resulting surface integrity of equiatomic CoCrFeNi-MEA specimens. For that reason, milling parameters (cutting speed, feed per cutting edge) were systematically varied for both conventional milling and USAM. The surface integrity was analyzed in terms of topography, defects, and residual stresses. Especially USAM leads to a decrease of occurring cutting forces and, hence, to an improvement of the surface integrity. Beneficial effects were observed in terms of lower tensile residual stresses at high cutting speed and feed per cutting edge.</abstract>
    <parentTitle language="eng">Procedia CIRP</parentTitle>
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    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Tim Richter</author>
    <author>Diego Delgado Arroyo</author>
    <author>Andreas Börner</author>
    <author>Dirk Schröpfer</author>
    <author>Michael Rhode</author>
    <author>T. Lindner</author>
    <author>M. Löbel</author>
    <author>B. Preuß</author>
    <author>T. Lampke</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Medium entropy alloy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Ultrasonic Assisted Machining</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Surface Integrity</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
    <collection role="institutes" number="">9.2 Versuchsanlagen und Prüftechnik</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="themenfelder" number="">Degradationsmechanismen</collection>
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    <file>https://opus4.kobv.de/opus4-bam/files/55445/PROCEDIA CIRP_Ultrasonic assisted milling of a CoCrFeNi medium entropy alloy.pdf</file>
  </doc>
  <doc>
    <id>56629</id>
    <completedYear/>
    <publishedYear>2022</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>793</pageFirst>
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    <edition/>
    <issue/>
    <volume>108</volume>
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    <title language="eng">Tool development for hybrid finishing milling of iron aluminides</title>
    <abstract language="eng">The importance of high-temperature materials made of iron aluminides (FeAl) has been increasing in light weight applications, e.g., airplane turbines, due to the high material’s specific strength. However, the highly economic production by means of permanent mold casting involves special microstructures for Fe26Al4Mo0.5Ti1B alloy components leading to difficult machinability for subsequent finishing milling and low surface qualities. Major effects of tool and machining parameter variation incorporating ultrasonic assistance on the milling process and surface integrity are shown. Loads for tool and component surface are significantly adjustable to enable an economic process chain regarding the surface integrity of safety-relevant components.</abstract>
    <parentTitle language="eng">Procedia CIRP</parentTitle>
    <identifier type="doi">10.1016/j.procir.2022.03.123</identifier>
    <identifier type="issn">2212-8271</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-566294</identifier>
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    <licence>Creative Commons - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International</licence>
    <author>Julien Witte</author>
    <author>Dirk Schröpfer</author>
    <author>M. Hamacher</author>
    <author>H. Michels</author>
    <author>C. Hamm</author>
    <author>M. Appelt</author>
    <author>Andreas Börner</author>
    <author>Thomas Kannengießer</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Ultrasonic-assisted milling</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Iron aluminide</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Surface integrity</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Tool wear</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
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    <collection role="unnumberedseries" number="">Wissenschaftliche Artikel der BAM</collection>
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    <file>https://opus4.kobv.de/opus4-bam/files/56629/J.Witte_Tool development for hybrid finishing milling of iron aluminides.pdf</file>
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    <completedYear/>
    <publishedYear>2023</publishedYear>
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    <language>eng</language>
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    <pageLast>9</pageLast>
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    <publisherName>Springer</publisherName>
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    <title language="eng">Microstructure characterization of dissimilar metal welds of innovative high- and medium-entropy alloys to austenitic stainless steels joint by tungsten inert gas and friction stir welding</title>
    <abstract language="eng">The new multi-element alloying concept of systems with defined entropy (HEA — high-entropy alloy or MEA — medium-entropy alloy) is increasing in material research interest. Improved properties or combinations of properties are shown by several systems. Thus, the resulting microstructures and production of HEA/MEA as well as properties have been primarily investigated so far. Furthermore, processing is a key issue to transfer HEA/MEA systems to real components. Since welding is the most important joining process for metals, it is crucial to investigate the influence of welding to guarantee component integrity. Since most HEA are made of expensive alloying elements such as Co or Ni, they will not be used entirely as structural materials. Thus, it can be advantageous to weld conventional alloys such as austenitic stainless steels with the HEA and MEA to produce components that are both application-oriented and economically viable. Therefore, in this paper, first results of dissimilar metal welding, by tungsten inert gas (TIG) and friction stir welding (FSW), of a CoCrFeMnNi HEA as well as a CoCrNi MEA with a conventional AISI 304 austenitic stainless steel are presented. The focus is on the microstructure formation due to the two welding processes. The results of TIG welding show a dendritic microstructure, whereas in FSW both materials are stirred but still coexist.</abstract>
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    <author>Tim Richter</author>
    <author>Kjell Erxleben</author>
    <author>Michael Rhode</author>
    <author>Dirk Schröpfer</author>
    <author>Thomas Michael</author>
    <author>Andreas Börner</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Metals and Alloys</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Mechanical Engineering</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Mechanics of Materials</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
    <collection role="institutes" number="">9.2 Versuchsanlagen und Prüftechnik</collection>
    <collection role="institutes" number="">9.4 Integrität von Schweißverbindungen</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="themenfelder" number="">Degradationsmechanismen</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="themenfelder" number="">Materialdesign</collection>
  </doc>
  <doc>
    <id>55709</id>
    <completedYear/>
    <publishedYear>2022</publishedYear>
    <thesisYearAccepted/>
    <language>deu</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>lecture</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="deu">Ultraschallunterstütztes Schlichtfräsen einer schwer spanbaren FeNi-Legierung</title>
    <abstract language="deu">Zunächst wird die BAM vorgestellt. Anschließend wird die Messung bzw. Bestimmung der Amplitude der Ultraschallunterstützung erläutert, gefolgt von Schlichtfräsexperimenten an AM-Bauteilen aus einer schwer spanbaren FeNi-Legierung. Es werden die Ergebnisse der Zerspankraft, der Rauheit und der Eigenspannungen vorgestellt.</abstract>
    <enrichment key="eventName">Ultrasonic Seminar</enrichment>
    <enrichment key="eventPlace">Stipshausen, Germany</enrichment>
    <enrichment key="eventStart">08.09.2022</enrichment>
    <enrichment key="eventEnd">08.09.2022</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <enrichment key="InvitedTalks">0</enrichment>
    <author>Lorenz Engelking</author>
    <author>Andreas Börner</author>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Ultraschallunterstütztes Fräsen</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Alloy 36</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Schwer spanbar</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Additive Fertigung</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
    <collection role="institutes" number="">9.2 Versuchsanlagen und Prüftechnik</collection>
    <collection role="institutes" number="">9.4 Integrität von Schweißverbindungen</collection>
    <collection role="themenfelder" number="">Energie</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>
  </doc>
  <doc>
    <id>57561</id>
    <completedYear/>
    <publishedYear>2023</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>7</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>522</volume>
    <type>article</type>
    <publisherName>Elsevier B.V.</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Wear behavior of innovative niobium carbide cutting tools in ultrasonic-assisted finishing milling</title>
    <abstract language="eng">The resources of niobium exceed the ones of tungsten by an order of magnitude. With 92%, Brazil is today the main global producer of niobium. Hence, niobium carbides (NbC) are a sustainable and economic alternative to conventionally used cutting materials, especially tungsten carbides (WC). Moreover, NbC can be used in Ni alloy matrix and thus offer significant advantages by substituting WC in Co matrix as cutting materials in terms of health risks and raw material price and supply risk. Based on recent studies which found an increased performance of NbC compared to WC cutting tools in machining higher strength steels, the composition NbC12Ni4Mo4VC was chosen for finish machining of a high-strength steel S960QL in this study. The experiments were carried out on an ultrasonic-assisted 5-axis milling machine using NbC tools specially made to benchmark them with commercially available coated WC cutting inserts. In addition, the influence of a coating system for the NbC inserts is tested and evaluated for its performance in the cutting process. Tool wear and cutting force analyses are implied to identify optimal parameter combinations as well as tool properties for the novel NbC tool. Together with the oscillation of ultrasonic-assisted milling, the loads on the component surface and the tool can be reduced and the wear behavior of the novel NbC tool can be refined. These milling tests are accompanied by standardized wear tests, i.e., pin-on-disc, between the aforementioned material combinations, and the results are correlated with each other. Finally, the behavior when using hard-to-cut materials such as Ni alloys, or innovative materials such as iron aluminide is also being tested, as these are constantly in the focus of machining optimization. With this strategy, comprehensive knowledge is achievable for future efficient application of NbC for milling tools, which have already been researched for decades using WC.</abstract>
    <parentTitle language="eng">24th International Conference on Wear of Materials</parentTitle>
    <identifier type="doi">10.1016/j.wear.2023.204722</identifier>
    <identifier type="issn">0043-1648</identifier>
    <enrichment key="eventName">24th International Conference on Wear of Materials</enrichment>
    <enrichment key="eventPlace">Banff, Canada</enrichment>
    <enrichment key="eventStart">16.04.2023</enrichment>
    <enrichment key="eventEnd">20.04.2023</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="date_peer_review">31.05.2023</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <author>Julien Witte</author>
    <author>Daniela Hübler</author>
    <author>Dirk Schröpfer</author>
    <author>Andreas Börner</author>
    <author>Thomas Kannengießer</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Niobium carbide</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Cutting tool</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Ultrasonic-assisted milling</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Tool wear</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
    <collection role="institutes" number="">9.2 Versuchsanlagen und Prüftechnik</collection>
    <collection role="institutes" number="">9.4 Integrität von Schweißverbindungen</collection>
    <collection role="themenfelder" number="">Energie</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="themenfelder" number="">Degradationsmechanismen</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="institutes" number="">9.5 Tribologie und Verschleißschutz</collection>
  </doc>
  <doc>
    <id>52487</id>
    <completedYear/>
    <publishedYear>2021</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1427</pageFirst>
    <pageLast>1442</pageLast>
    <pageNumber/>
    <edition/>
    <issue>5-6</issue>
    <volume>114</volume>
    <type>article</type>
    <publisherName>Springer</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Surface finishing of hard-to-machine cladding alloys for highly stressed components</title>
    <abstract language="eng">The supply and processing of materials for highly stressed components are usually cost-intensive. Efforts to achieve cost and resource efficiency lead to more complex structures and contours. Additive manufacturing steps for component repair and production offer significant economic advantages. Machining needs to be coordinated with additive manufacturing steps in a complementary way to produce functional surfaces suitable for the demands. Regarding inhomogeneity and anisotropy of the microstructure and properties as well as production-related stresses, a great deal of knowledge is still required for efficient use by small- and medium-size enterprises, especially for the interactions of subsequent machining of these difficult-to-machine materials. Therefore, investigations on these influences and interactions were carried out using a highly innovative cost-intensive NiCrMo alloy (IN725). These alloys are applied for claddings as well as for additive component manufacturing and repair welding using gas metal arc welding processes. For the welded specimens, the adequate solidification morphology, microstructure and property profile were investigated. The machinability in terms of finishing milling of the welded surfaces and comparative analyses for ultrasonic-assisted milling processes was examined focussing on surface integrity. It was shown that appropriate cutting parameters and superimposed oscillating of the milling tool in the direction of the tool rotation significantly reduce the mechanical loads for tool and workpiece surface. This contributes to ensure a high surface integrity, especially when cutting has to be carried out without cooling lubricants.</abstract>
    <parentTitle language="eng">The International Journal of Advanced Manufacturing Technology</parentTitle>
    <identifier type="doi">10.1007/s00170-021-06815-y</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-524872</identifier>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="date_peer_review">22.04.2021</enrichment>
    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Dirk Schröpfer</author>
    <author>K. Treutler</author>
    <author>Andreas Börner</author>
    <author>R. Gustus</author>
    <author>Thomas Kannengießer</author>
    <author>V. Wesling</author>
    <author>W. Maus-Friedrichs</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>WAAM</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>IN725</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Machining</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Ultrasonic-assisted milling</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Residual stresses</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Cutting forces</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Surface integrity</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Microstructure</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
    <collection role="institutes" number="">9.2 Versuchsanlagen und Prüftechnik</collection>
    <collection role="institutes" number="">9.4 Integrität von Schweißverbindungen</collection>
    <collection role="themenfelder" number="">Energie</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="themenfelder" number="">Degradationsmechanismen</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/52487/Schroepfer_et_al-2021-The_International_Journal_of_Advanced_Manufacturing_Technology.pdf</file>
  </doc>
  <doc>
    <id>52255</id>
    <completedYear/>
    <publishedYear>2021</publishedYear>
    <thesisYearAccepted/>
    <language>deu</language>
    <pageFirst>502</pageFirst>
    <pageLast>511</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation>Clausthaler Zentrum für Materialtechnik</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="deu">Rührreibschweißen von Hoch- und Mittelentropie-Legierungen</title>
    <abstract language="deu">Hoch- und Mittelentropie-Legierungen (engl. High/Medium Entropy Alloys–HEA/MEA) sind relativ neue Werkstoffklassen. Im Gegensatz zu herkömmlichen Le-gierungen bestehen HEA aus fünf bzw. MEA aus drei oder vier Legierungselementen im äquiatomaren Gleichgewicht. Viele HEA weisen aufgrund hervorragender struktu-reller Eigenschaftskombinationen von sehr tiefen bis zu hohen Temperaturen enor-mes Anwendungspotential auf. Die Anwendung für reale Bauteile stellt jedoch die zentrale Frage der Eignung für die fügetechnische Verarbeitung. Dieser Aspekt findet in der weltweiten Materialforschung bisher kaum Beachtung. Anforderungen an die zuverlässige und sichere fügetechnische Verarbeitung dieser Werkstoffe sind von wesentlicher Bedeutung hinsichtlich wirtschaftlicher Bauteilfertigung für spätere po-tenzielle Anwendungsbereiche, bspw. in der Energietechnik. Das Rührreibschweißen (engl. Friction Stir Welding–FSW) stellt hierbei einen vielversprechenden Fügepro-zess dar, dessen Hauptvorteil in der Schweißprozesstemperatur unterhalb der Schmelztemperatur der zu fügenden Werkstoffe liegt. Dies bedingt die Vermeidung der Ausbildung von harten, versprödenden intermetallischen Phasen, wie sie z. B. beim konventionellen Schmelzschweißen von Eisen-Aluminium-Verbindungen auf-treten. Die vorliegende Arbeit stellt grundlegende Untersuchungen zur Schweißbar-keit einer CoCrFeMnNi-Legierung (HEA) und einer CoCrNi-Legierung (MEA) mit dem FSW-Prozess vor. Die Versuchsschweißungen werden mittels mikroskopischer Analysen hinsichtlich des Schweißnahtaufbaus sowie Schweißnahtfehlern charakte-risiert. FSW zeigt sich als grundlegend geeignet zur Verbindungsschweißung der HEA bzw. MEA. Anhand dieser Ergebnisse kann eine weitere Bewertung der Schweißbar-keit erfolgen.</abstract>
    <parentTitle language="deu">Tagungsband 4. Symposium Material Technik</parentTitle>
    <enrichment key="eventName">4 Niedersächsisches Symposium Materialtechnik Clausthal</enrichment>
    <enrichment key="eventPlace">Online meeting</enrichment>
    <enrichment key="eventStart">25.02.2021</enrichment>
    <enrichment key="eventEnd">26.02.2021</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <author>Tim Richter</author>
    <author>Dirk Schröpfer</author>
    <author>Michael Rhode</author>
    <author>Andreas Börner</author>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Hochentropie Legierung</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Rührreibschweißen</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Mediumentropie Legierung</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
    <collection role="institutes" number="">9.2 Versuchsanlagen und Prüftechnik</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="">Graue Literatur</collection>
    <collection role="institutes" number="">9.0 Abteilungsleitung und andere</collection>
  </doc>
  <doc>
    <id>51295</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>11</pageLast>
    <pageNumber/>
    <edition/>
    <issue>012016</issue>
    <volume>882</volume>
    <type>conferenceobject</type>
    <publisherName>Institute of Physics</publisherName>
    <publisherPlace>London</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Influence of modern machining processes on the surface integrity of high-entropy alloys</title>
    <abstract language="eng">High Entropy Alloys (HEAs) are a recent class of materials. In contrast to conventional alloys, HEAs consist of five alloying elements in equiatomic equilibrium. The high entropy effect is due, among other things, to the increased configuration entropy, which promotes solid solution formation. Many HEAs have enormous application potential due to excellent structural property combinations from very low to high temperatures. For the introduction of HEAs in real components, however, the question of the applicability of machining production technologies for component manufacture is of central importance. This has so far received Little attention in global materials research. Reliable and safe processing is essential for the demand of economical component production for potential areas of application, e.g. in power plant technology.&#13;
For metals, milling is the standard machining process. This article presents the results of machining analyses. It focuses on the surface integrity resulting from the milling process on a Co20Cr20Fe20Mn20Ni20-HEA. For this purpose, investigations were carried out using ball nose end milling tools for conventional milling process in comparison to an innovative hybrid process available at BAM Berlin, Ultrasonic-Assisted Milling (USAM). USAM promises a lower Degradation of the surface properties due to lower loads on the workpiece surface during machining.&#13;
For this purpose, basic milling parameters (cutting speed and tooth feed) were systematically varied and cutting forces were measured during the milling experiments. The subsequent Analysis of these forces allows an understanding of the mechanical loads acting on the tool and component surface. These loads cause topographical, mechanical and microstructural influences on the surface and consequently on the surface integrity. For their characterization, light and scanning electron microscopy were used, and the roughness and residual stresses via X-ray diffraction were measured. The results indicate significant advantages using USAM, especially due to reduced cutting forces compared to the conventional milling process. This causes lower mechanical loads on the tool and surface, combined with lower tensile residual stresses on and below the surface, and ultimately results in a significantly enhanced surface integrity.</abstract>
    <parentTitle language="eng">IOP conference series: Materials science and engineering</parentTitle>
    <identifier type="doi">10.1088/1757-899X/882/1/012016</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-512958</identifier>
    <enrichment key="eventName">Symposium on Materials and Joining Magdeburg 2020</enrichment>
    <enrichment key="eventPlace">Online meeting</enrichment>
    <enrichment key="eventStart">07.09.2020</enrichment>
    <enrichment key="eventEnd">08.09.2020</enrichment>
    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Tim Richter</author>
    <author>Dirk Schröpfer</author>
    <author>Michael Rhode</author>
    <author>Andreas Börner</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>High entropy alloy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Machining</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Ultrasonic machining</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
    <collection role="institutes" number="">9.2 Versuchsanlagen und Prüftechnik</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="themenfelder" number="">Degradationsmechanismen</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="">9.0 Abteilungsleitung und andere</collection>
    <collection role="themenfelder" number="">Materialdesign</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-bam/files/51295/10_1088_1757-899X_882_1_012016.pdf</file>
  </doc>
  <doc>
    <id>59219</id>
    <completedYear/>
    <publishedYear>2023</publishedYear>
    <thesisYearAccepted/>
    <language>deu</language>
    <pageFirst>738</pageFirst>
    <pageLast>748</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>12</volume>
    <type>conferenceobject</type>
    <publisherName>Shaker Verlag</publisherName>
    <publisherPlace>Düren</publisherPlace>
    <creatingCorporation>Clausthaler Zentrum für Materialtechnik</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="deu">Ultraschallunterstütztes Fräsen zur Reduzierung der Belastung auf Werkzeug und Bauteiloberfläche von Eisenaluminid-Bauteilen</title>
    <abstract language="deu">Intermetallische Werkstoffe werden für Hochtemperaturanwendungen immer wichtiger. Insbesondere Aluminide mit hohen spezifischen Festigkeiten haben ein großes Potenzial für Leichtbauanwendungen, z. B. werden Titanaluminide bereits in Flugzeugturbinen eingesetzt. Ökonomische und ökologische Aspekte sind die treibende Kraft zur Substitution konventioneller Legierungen, z. B. Nickelbasislegierungen, die eine wesentlich höhere Kostenintensität und ein höheres Gewichts-Festigkeits-Verhältnis aufweisen. Insbesondere Eisenaluminide (FeAl) sind aufgrund guter mechanischer Eigenschaften und der guten Verfügbarkeit der wichtigsten Hauptlegierungselemente attraktiv. Speziell entwickelte FeAl-Legierungskonzepte ermöglichen eine wirtschaftliche Produktion im Kokillenguss, bei der die Erstarrung der Schmelze spezielle komplexe Gefüge ermöglicht, um die hohen thermischen und mechanischen Eigenschaften durch eine hohe Anzahl von harten Ausscheidungen entlang der Korngrenzen zu erreichen. Zu diesen Eigenschaften gehört aber auch, dass notwendige Bearbeitungsschritte, wie das Schlichtfräsen, zur Erzielung komplexer Endkonturen, zu vorzeitigem Werkzeugverschleiß und geringen Oberflächengüten führen. Für das finale FeAl-Bauteil ist eine hohe Oberflächenintegrität insbesondere in sicherheitsrelevanten Anwendungen in der Luftfahrt oder im Energiebereich erforderlich. Aus diesem Grund konzentriert sich die vorliegende Untersuchung auf die Mechanismen und die Minimierung des Werkzeugverschleißes und die Auswirkungen auf die Oberfläche eines in Kokille vergossenen FeAl-Bauteils. Neben den Optimierungen des Fräsprozesses und der Werkzeugparameter (Geometrie, Material) wird ein modernes hybrides Bearbeitungsverfahren, das ultra-schallunterstützte Fräsen (USAM), eingesetzt, bei dem eine Überlagerung mit einer hochfrequenten Schwingung des rotierenden Werkzeugs erzeugt wird. Analysen der Kräfte und Temperaturen im Fräsprozess, der Verschleißerscheinungen am Werkzeug und der Oberflächenintegrität zeigen positive Auswirkungen durch USAM. Darüber hinaus wird eine valide Grundlage für die Optimierung des Werkzeugs und des Fräsprozesses geschaffen, um eine hohe Oberflächenintegrität (z. B. Verringerung von Zugeigenspannungen und Defekten) und eine längere Werkzeuglebensdauer zu gewährleisten, die zukünftig eine wirtschaftliche Herstellung von FeAl-Bauteilen ermöglicht.</abstract>
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