Recrystallisation behaviour of a fully austenitic Nb-stabilised stainless steelCitation formats

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Recrystallisation behaviour of a fully austenitic Nb-stabilised stainless steel. / Barcellini, Chiara; Dumbill, Simon; Jimenez-Melero, Enrique.

In: Journal of Microscopy, Vol. 274, No. 1, 04.2019, p. 3-12.

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Barcellini, Chiara ; Dumbill, Simon ; Jimenez-Melero, Enrique. / Recrystallisation behaviour of a fully austenitic Nb-stabilised stainless steel. In: Journal of Microscopy. 2019 ; Vol. 274, No. 1. pp. 3-12.

Bibtex

@article{ad6f082b7636486fb918e5ceae3a0346,
title = "Recrystallisation behaviour of a fully austenitic Nb-stabilised stainless steel",
abstract = "We have performed an in-depth characterisation of the microstructure evolution of 20Cr-25Ni Nb-stabilised austenitic stainless steel during 1h isochronal annealing up to 1100°C using scanning electron microscopy. This steel grade is used as cladding material in advanced gas-cooled fission reactors, due to its resistance to thermal creep and oxidation. The initial deformed microstructure undergoes recrystallisation via a strain-induced boundary migration mechanism, attaining a fully recrystallised microstructure at 850C. A number of twins are observed in the vicinity of deformation bands prior to the start of recrystallisation. New Nb(C,N) particles form gradually in the microstructure, and the particle dispersion presents a maximum volume fraction of 2.7% at 930°C. At higher temperatures, the smaller particles become unstable and gradually dissolve in the matrix. Consequently, the Zener pinning pressure exerted on the grain boundaries is progressively released, triggering the growth of the austenite grains up to an average size of 47m at 1100°C. The observed temperature window for recrystallisation and grain growth can be predicted by a unified model based primarily on the migration of high and low angle grain boundaries.",
author = "Chiara Barcellini and Simon Dumbill and Enrique Jimenez-Melero",
year = "2019",
month = apr,
doi = "10.1111/jmi.12776",
language = "English",
volume = "274",
pages = "3--12",
journal = "Journal of Microscopy",
issn = "0022-2720",
publisher = "John Wiley & Sons Ltd",
number = "1",

}

RIS

TY - JOUR

T1 - Recrystallisation behaviour of a fully austenitic Nb-stabilised stainless steel

AU - Barcellini, Chiara

AU - Dumbill, Simon

AU - Jimenez-Melero, Enrique

PY - 2019/4

Y1 - 2019/4

N2 - We have performed an in-depth characterisation of the microstructure evolution of 20Cr-25Ni Nb-stabilised austenitic stainless steel during 1h isochronal annealing up to 1100°C using scanning electron microscopy. This steel grade is used as cladding material in advanced gas-cooled fission reactors, due to its resistance to thermal creep and oxidation. The initial deformed microstructure undergoes recrystallisation via a strain-induced boundary migration mechanism, attaining a fully recrystallised microstructure at 850C. A number of twins are observed in the vicinity of deformation bands prior to the start of recrystallisation. New Nb(C,N) particles form gradually in the microstructure, and the particle dispersion presents a maximum volume fraction of 2.7% at 930°C. At higher temperatures, the smaller particles become unstable and gradually dissolve in the matrix. Consequently, the Zener pinning pressure exerted on the grain boundaries is progressively released, triggering the growth of the austenite grains up to an average size of 47m at 1100°C. The observed temperature window for recrystallisation and grain growth can be predicted by a unified model based primarily on the migration of high and low angle grain boundaries.

AB - We have performed an in-depth characterisation of the microstructure evolution of 20Cr-25Ni Nb-stabilised austenitic stainless steel during 1h isochronal annealing up to 1100°C using scanning electron microscopy. This steel grade is used as cladding material in advanced gas-cooled fission reactors, due to its resistance to thermal creep and oxidation. The initial deformed microstructure undergoes recrystallisation via a strain-induced boundary migration mechanism, attaining a fully recrystallised microstructure at 850C. A number of twins are observed in the vicinity of deformation bands prior to the start of recrystallisation. New Nb(C,N) particles form gradually in the microstructure, and the particle dispersion presents a maximum volume fraction of 2.7% at 930°C. At higher temperatures, the smaller particles become unstable and gradually dissolve in the matrix. Consequently, the Zener pinning pressure exerted on the grain boundaries is progressively released, triggering the growth of the austenite grains up to an average size of 47m at 1100°C. The observed temperature window for recrystallisation and grain growth can be predicted by a unified model based primarily on the migration of high and low angle grain boundaries.

U2 - 10.1111/jmi.12776

DO - 10.1111/jmi.12776

M3 - Article

VL - 274

SP - 3

EP - 12

JO - Journal of Microscopy

JF - Journal of Microscopy

SN - 0022-2720

IS - 1

ER -