30
views
0
recommends
+1 Recommend
0 collections
    1
    shares
      • Record: found
      • Abstract: found
      • Article: found

      Microstructural Characterization of Martensitic Q&P Steels – a Comparison of Etching Techniques and Electron Backscatter Diffraction Translated title: Gefügecharakterisierung martensitischer Q&P-Stähle – Vergleich zwischen Ätzverfahren und Rückstreuelektronenbeugung

      research-article
      1 , 1 , 1 , 1
      Practical Metallography
      Carl Hanser Verlag

      Read this article at

      ScienceOpenPublisher
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          A wide range of methods and procedures exists to characterize microstructures and to quantify phases. This work presents a comparison between light microscopic examinations as a function of different etching methods and electron backscatter diffraction analyses. The procedures used in this context were etching with V2A solution, Kalling I and Beraha II etchants. The objective was to quantify the austenite phase in Q&P heat treated X46Cr13. The Q&P heat treatment allows to achieve high mechanical strengths (for X46Cr13 approx. R p0.2 = 1750 MPa) alongside high elongations at break (A = 14 %). This can be attributed to a combination martensite tempering and the TRIP effect. The required specific ratio of martensite and austenite can be established by the heat treatment. In order to define the heat treatment's optimal parameters, the mechanical characteristic values need to be determined and comprehensive phase fraction determinations must be performed. Beraha II provided particularly promising results. Compared with EBSD, matching phase fractions of austenite could be determined with deviations of the absolute values between one and three percent. This method offers a possible alternative to, or supplements the microstructural characterization and assessment of the material development for a high sample throughput and at reduced cost and effort.

          Kurzfassung

          Die Methoden und Verfahren der Gefügecharakterisierung und Phasenquantifizierung umfassen ein vielseitiges Spektrum. In dieser Arbeit wird ein Vergleich zwischen lichtmikroskopischen Untersuchungen in Abhängigkeit unterschiedlicher Ätzverfahren und Analysen mittels Rückstreuelektronenbeugung präsentiert. Dabei genutzte Ätzverfahren waren V2A-Beize, Kalling I und Beraha II. Das Ziel bestand in der Phasenquantifizierung von Austenit in einem Q&P-wärmebehandelten X46Cr13. Die Q&P-Wärmebehandlung ermöglicht hohe mechanische Festigkeiten (für X46Cr13 ca. R p0,2 = 1750 MPa) bei gleichzeitig hohen Bruchdehnungen (A = 14 %), was auf einer Kombination von Anlassen des Martensits und TRIP-Effekt beruht. Hierfür ist ein spezielles Verhältnis von Martensit und Austenit notwendig, welches über die Wärmebehandlung eingestellt werden kann. Um deren optimale Parameter definieren zu können, sind neben der Ermittlung der mechanischen Kennwerte auch umfangreiche Phasenanteilsbestimmungen notwendig. Insbesondere Beraha II lieferte vielversprechende Ergebnisse. Im Vergleich mit EBSD konnten gleiche Phasenanteile an Austenit mit Abweichungen der absoluten Werte zwischen einem und drei Prozent bestimmt werden. Für einen großen Probenumfang und zur Reduzierung von Zeitaufwand und Kosten, bietet diese Methode eine mögliche Alternative bzw. Ergänzung bei der Gefügecharakterisierung und Werkstoffentwicklung.

          Related collections

          Most cited references1

          • Record: found
          • Abstract: found
          • Article: found

          Microstructural Characterization of Martensitic Q&P Steels – a Comparison of Etching Techniques and Electron Backscatter Diffraction

          A wide range of methods and procedures exists to characterize microstructures and to quantify phases. This work presents a comparison between light microscopic examinations as a function of different etching methods and electron backscatter diffraction analyses. The procedures used in this context were etching with V2A solution, Kalling I and Beraha II etchants. The objective was to quantify the austenite phase in Q&P heat treated X46Cr13. The Q&P heat treatment allows to achieve high mechanical strengths (for X46Cr13 approx. R p0.2 = 1750 MPa) alongside high elongations at break (A = 14 %). This can be attributed to a combination martensite tempering and the TRIP effect. The required specific ratio of martensite and austenite can be established by the heat treatment. In order to define the heat treatment's optimal parameters, the mechanical characteristic values need to be determined and comprehensive phase fraction determinations must be performed. Beraha II provided particularly promising results. Compared with EBSD, matching phase fractions of austenite could be determined with deviations of the absolute values between one and three percent. This method offers a possible alternative to, or supplements the microstructural characterization and assessment of the material development for a high sample throughput and at reduced cost and effort.
            Bookmark

            Author and article information

            Journal
            pm
            Practical Metallography
            Carl Hanser Verlag
            0032-678X
            2195-8599
            15 October 2018
            : 55
            : 10
            : 660-677
            Affiliations
            1 Otto-von-Guericke-Univer-sität Magdeburg, Institut für Werkstoff- und Fügetechnik; e-mail: sebastian.dieck@ 123456ovgu.de
            Author notes

            Translation: E. Engert

            Article
            PM110514
            10.3139/147.110514
            8ea08b08-eff2-4bee-9266-7ea1c432d5df
            © 2018, Carl Hanser Verlag, München
            History
            : 1 January 2018
            : 23 April 2018
            Page count
            References: 23, Pages: 18
            Categories
            Technical Contributions/Fachbeiträge

            Materials technology,Materials characterization,Materials science
            Materials technology, Materials characterization, Materials science

            Comments

            Comment on this article