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Investigation of the Effects of Low-Pressure Carburizing Process Parameters on Microstructural Evolution by Means of In Situ Synchrotron X-Ray Diffraction

Tapar, Ogün Baris; Steinbacher, Matthias; Gibmeier, Jens 1; Epp, Jérémy
1 Karlsruher Institut für Technologie (KIT)

Abstract:
In situ X-ray diffraction experiments during low-pressure carburizing processes are performed at the German Electron Synchrotron Facility, Beamline P07, in Hamburg, Germany, with a specially developed process chamber. Microstructural evolution is precisely analyzed based on diffraction data, and several process parameters are varied. The investigations focus on boost and diffusion steps in which carbon donor gas interacts with the hot steel surface and carbon atoms diffuse through the sample. An increased process temperature leads to higher carbon absorption during the boost step, especially at the early stages of the process. Regardless of process parameters, austenite saturation is reached in a few seconds. Therefore, longer boost step duration and/or a higher acetylene amount does not directly increase the carbon profile; instead, this would only increase the amount of carbides formed on the surface, which would contribute to the carbon profile by dissolution in the following steps. Therefore, shorter and a high number of boost steps are recommended for high efficiency. The cementite formation rate shows a similar trend with austenite saturation. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000133663
Veröffentlicht am 09.06.2021
Originalveröffentlichung
DOI: 10.1002/adem.202100124
Scopus
Zitationen: 1
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Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 11.2021
Sprache Englisch
Identifikator ISSN: 1438-1656, 1527-2648
KITopen-ID: 1000133663
Erschienen in Advanced Engineering Materials
Verlag Deutsche Gesellschaft für Materialkunde e.V. (DGM)
Band 23
Heft 11
Seiten Art. Nr.: 2100124
Bemerkung zur Veröffentlichung Special Issue: Neutrons and Synchrotron Radiation – Unique Tools for the Characterization of Materials
Vorab online veröffentlicht am 07.05.2021
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