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Journal Article

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

Authors

Ackermann,  Stephanie
External Organizations;

Martin,  Stefan
External Organizations;

Schwarz,  Marcus R.
External Organizations;

Schimpf,  Christian
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Kulawinski,  Dirk
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/persons/resource/lathe

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

Henkel,  Sebastian
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Rafaja,  David
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Biermann,  Horst
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Weidner,  Anja
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Citation

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


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1342139
Abstract
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).