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Investigation of Phase Transformations in High-Alloy Austenitic TRIP Steel Under High Pressure (up to 18 GPa) by In Situ Synchrotron X-ray Diffraction and Scanning Electron Microscopy

Urheber*innen

Ackermann,  Stephanie
External Organizations;

Martin,  Stefan
External Organizations;

Schwarz,  Marcus R.
External Organizations;

Schimpf,  Christian
External Organizations;

Kulawinski,  Dirk
External Organizations;

/persons/resource/lathe

Lathe,  Christian
CGS Centre for Geological Storage, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Henkel,  Sebastian
External Organizations;

Rafaja,  David
External Organizations;

Biermann,  Horst
External Organizations;

Weidner,  Anja
External Organizations;

Externe Ressourcen
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Volltexte (frei zugänglich)
Es sind keine frei zugänglichen Volltexte in GFZpublic verfügbar
Ergänzendes Material (frei zugänglich)
Es sind keine frei zugänglichen Ergänzenden Materialien verfügbar
Zitation

Ackermann, S., Martin, S., Schwarz, M. R., Schimpf, C., Kulawinski, D., Lathe, C., Henkel, S., Rafaja, D., Biermann, H., Weidner, A. (2016): Investigation of Phase Transformations in High-Alloy Austenitic TRIP Steel Under High Pressure (up to 18 GPa) by In Situ Synchrotron X-ray Diffraction and Scanning Electron Microscopy. - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 47, 1, 95-111.
https://doi.org/10.1007/s11661-015-3082-2


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1342139
Zusammenfassung
In order to clarify the difference between the deformation-induced ε-martensite (ε 1) and the pressure-induced ε-iron (ε 2), high-pressure quasi-hydrostatic experiments were performed on a low-carbon, high-alloy metastable austenitic steel. In situ synchrotron X-ray diffraction measurements as well as post-mortem investigations of the microstructure by electron backscatter diffraction were carried out to study the microstructural transformations. Three processes were observed during compression experiments: first, the formation of deformation-induced hexagonal ε 1-martensite, as well as small nuclei of deformation-induced bcc α′-martensite (α 1′) within the fcc γ-matrix due to non-hydrostaticity in the experiments; second, the onset of the phase transformation from the metastable fcc γ-austenite into the hexagonal pressure-induced ε 2-iron phase occurred at around 6 GPa; third, during decompression, the hexagonal pressure-induced ε 2-iron transformed partially into bcc α′-martensite (α 2′). Completely different characteristics with regard to habitus as well as to orientation relationships were observed between the pressure-induced phases (ε 2-iron phase and α 2′-martensite) and the deformation-induced martensites (ε 1- and α 1′-martensite).