The role of Ti and TiC nanoprecipitates in radiation resistant austenitic steel: A nanoscale study
Cautaerts N, Delville R, Stergar E, Pakarinen J, Verwerft M, Yang Y, Hofer C, Schnitzer R, Lamm S, Felfer P, Schryvers D (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 197
Pages Range: 184-197
DOI: 10.1016/j.actamat.2020.07.022
Abstract
This work encompasses an in-depth transmission electron microscopy and atom probe tomography study of Ti-stabilized austenitic steel irradiated with Fe-ions. The focus is on radiation induced segregation and precipitation, and in particular on how Ti and TiC affect these processes. A 15-15Ti steel (grade: DIN 1.4970) in two thermo-mechanical states (cold-worked and aged) was irradiated at different temperatures up to a dose of 40 dpa. At low irradiation temperatures, the cold-worked and aged materials evolved to a similar microstructure dominated by small Si and Ni clusters, corresponding to segregation to small point defect clusters. TiC precipitates, initially present in the aged material, were found to be unstable under these irradiation conditions. Elevated irradiation temperatures resulted in the nucleation of nanometer sized Cr enriched TiC precipitates surrounded by Si and Ni enriched shells. In addition, nanometer sized Ti- and Mn-enriched G-phase (M6Ni16Si7) precipitates formed, often attached to TiC precipitates. Post irradiation, larger number densities of TiC were observed in the cold-worked material compared to the aged material. This was correlated with a lower volume fraction of G-phase. The findings suggest that at elevated irradiation temperatures, the precipitate-matrix interface is an important point defect sink and contributes to the improved radiation resistance of this material. The study is a first of its kind on stabilized steel and demonstrates the significance of the small Ti addition to the evolution of the microstructure under irradiation.
Authors with CRIS profile
Steffen Lamm
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Peter Felfer
Professur für Atom Probe Tomography
Additional Organisation(s)
Professur für Atom Probe Tomography
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Involved external institutions
Belgian Nuclear Research Centre (SCK•CEN) / Studiecentrum voor Kernenergie / Centre d'Étude de l'énergie Nucléaire
Belgium (BE)
Montanuniversität Leoben
Austria (AT)
University of Florida
United States (USA) (US)
University of Antwerp / Universiteit Antwerpen
Belgium (BE)
Belgium (BE)
Montanuniversität Leoben
Austria (AT)
University of Florida
United States (USA) (US)
University of Antwerp / Universiteit Antwerpen
Belgium (BE)
How to cite
APA:
Cautaerts, N., Delville, R., Stergar, E., Pakarinen, J., Verwerft, M., Yang, Y.,... Schryvers, D. (2020). The role of Ti and TiC nanoprecipitates in radiation resistant austenitic steel: A nanoscale study. Acta Materialia, 197, 184-197. https://dx.doi.org/10.1016/j.actamat.2020.07.022
MLA:
Cautaerts, Niels, et al. "The role of Ti and TiC nanoprecipitates in radiation resistant austenitic steel: A nanoscale study." Acta Materialia 197 (2020): 184-197.
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