Nanocluster evolution and mechanical properties of ion irradiated T91 ferritic-martensitic steel

T.P. Davis; M.A. Auger; Christina Hofer; Paul Bagot; M.P. Moody; D. E J Armstrong

doi:10.1016/j.jnucmat.2021.152842

Nanocluster evolution and mechanical properties of ion irradiated T91 ferritic-martensitic steel

T.P. Davis
, M.A. Auger
, Christina Hofer
, Paul Bagot
, M.P. Moody
, D. E J Armstrong

Universität Oxford
Universidad Carlos III de Madrid

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Begutachtung

3 Zitate (Scopus)

Abstract

Ion irradiation has been used to investigate the radiation-induced precipitation of nanoclusters and changes in mechanical properties of commercial-grade T91 ferritic-martensitic steel irradiated with Fe ⁴⁺ ions up to 4.10 dpa at 301 – 311 °C. Atom probe tomography was used to analyse the microstructure segregation and cluster formation, while nanoindentation was used to measure the change in mechanical properties. At 0.12 dpa, Si/P-rich clusters formation is observed. At 1.76 dpa, Mn, Ni and Si -rich precipitates (MNSP) were observed with a composition range that is distinctly different than the typically cited G-phase. The MNSP number density was similar to that from prior neutron irradiation studies at similar temperatures. Segregation of such species to dislocation loops and lines was also discussed. The hardness increased with radiation dose up to measured 1.83. Comparisons were made between the observed microstructural and mechanical property changes as a function of ion irradiated dose. The use of APT and nanoindentation, when applied in tandem, have shown to provide an insight into how radiation-induced microstructural effects can explain the observed changes in mechanical properties.

Originalsprache	Englisch
Aufsatznummer	152842
Seitenumfang	10
Fachzeitschrift	Journal of nuclear materials
Jahrgang	548.2021
Ausgabenummer	May
Frühes Online-Datum	29 Jan. 2021
DOIs	https://doi.org/10.1016/j.jnucmat.2021.152842
Publikationsstatus	Veröffentlicht - Mai 2021

Bibliographische Notiz

Funding Information:
T. P. Davis is funded by the Clarendon Scholarship from the University of Oxford and Engineering and Physical Sciences Research Council Fusion Centre for Doctorial Training [EP/L01663X/1]. APT was supported by EPSRC grant EP/M022803/1 “A LEAP 5000XR for the UK National Atom Probe Facility.” The authors acknowledge use of characterisation facilities within the David Cockayne Centre for Electron Microscopy, Department of Materials, University of Oxford, alongside financial support provided by the Henry Royce Institute (Grant ref EP/R010145/1 ). Funding of the Austrian BMK in the framework of the program “Production of the future” and the “BMK Professorship for Industry” are gratefully acknowledged. P.A.J. Bagot gratefully acknowledges support from the EU's Erasmus+ Programme to carry out TKD experiments with C. Hofer at Montanuniversität Leoben.

Publisher Copyright:
© 2021 Elsevier B.V.

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title = "Nanocluster evolution and mechanical properties of ion irradiated T91 ferritic-martensitic steel",

abstract = "Ion irradiation has been used to investigate the radiation-induced precipitation of nanoclusters and changes in mechanical properties of commercial-grade T91 ferritic-martensitic steel irradiated with Fe 4+ ions up to 4.10 dpa at 301 – 311 °C. Atom probe tomography was used to analyse the microstructure segregation and cluster formation, while nanoindentation was used to measure the change in mechanical properties. At 0.12 dpa, Si/P-rich clusters formation is observed. At 1.76 dpa, Mn, Ni and Si -rich precipitates (MNSP) were observed with a composition range that is distinctly different than the typically cited G-phase. The MNSP number density was similar to that from prior neutron irradiation studies at similar temperatures. Segregation of such species to dislocation loops and lines was also discussed. The hardness increased with radiation dose up to measured 1.83. Comparisons were made between the observed microstructural and mechanical property changes as a function of ion irradiated dose. The use of APT and nanoindentation, when applied in tandem, have shown to provide an insight into how radiation-induced microstructural effects can explain the observed changes in mechanical properties. ",

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AU - Auger, M.A.

AU - Hofer, Christina

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AU - Moody, M.P.

AU - Armstrong, D. E J

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AB - Ion irradiation has been used to investigate the radiation-induced precipitation of nanoclusters and changes in mechanical properties of commercial-grade T91 ferritic-martensitic steel irradiated with Fe 4+ ions up to 4.10 dpa at 301 – 311 °C. Atom probe tomography was used to analyse the microstructure segregation and cluster formation, while nanoindentation was used to measure the change in mechanical properties. At 0.12 dpa, Si/P-rich clusters formation is observed. At 1.76 dpa, Mn, Ni and Si -rich precipitates (MNSP) were observed with a composition range that is distinctly different than the typically cited G-phase. The MNSP number density was similar to that from prior neutron irradiation studies at similar temperatures. Segregation of such species to dislocation loops and lines was also discussed. The hardness increased with radiation dose up to measured 1.83. Comparisons were made between the observed microstructural and mechanical property changes as a function of ion irradiated dose. The use of APT and nanoindentation, when applied in tandem, have shown to provide an insight into how radiation-induced microstructural effects can explain the observed changes in mechanical properties.

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