Correlation between microstructural features and mechanical properties of irradiated LONGLIFE RPV steels

M. Serrano, F. Bergner, B. Radiguet, J. H. Lim, C. R. M. Grovenor, M. Hernandez-Mayoral, E. Meslin, K. Wilford, W. Van Renterghem, J. Kocik, S. Ortner, H. W. Viehrig, R. Chaouadi, M. Brumovsky, H. Hein, F. Gillemot, P. Todeschini, Tapio Planman, J. Ruoden, E. Altstadt

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

The possibility of extending the operational life of reactor pressure vessels (RPV) up to 80 years presents the problem of the availability of materials irradiated at high neutron fluence and low neutron flux. The ability of the existing trend curves to predict high fluence embrittlement is a question of debate, and a critical analysis of these curves should be based on a consistent microstructural examination of irradiated materials. Within the LONGLIFE 7FWP, neutron irradiated RPV materials, relevant for long term operation, some of them coming from surveillance programs, have been characterized by means of a combination of microstructural techniques (APT, SANS, TEM) and mechanical tests (hardness, tensile, impact and fracture toughness). In this paper the analysis of the links between microstructural features (solute nanoclusters, dislocation loops and voids) and hardening and embrittlement measurements by mechanical testing, is presented. Current hardening models, based on the contribution of precipitates, or nanoclusters, seem to underestimate irradiation hardening for very high fluences, mainly when matrix damage (dislocation loops) is observed. Regarding chemical composition effects, the predominant role of Ni and the synergism between Ni-Mn and Si are also identified. Low-Cu alloys show a threshold value of radiation induced features to produce an effect on mechanical properties which calls for further in-depth analyses.
Original languageEnglish
Title of host publicationProceedings of Fontevraud 8
Publication statusPublished - 2014
MoE publication typeA4 Article in a conference publication
EventFontevraud 8: Conference on Contribution of Materials Investigations and Operating Experience to LWRs' Safety, Performance and Reliability - Avignon, France
Duration: 15 Sep 201418 Sep 2014

Conference

ConferenceFontevraud 8
CountryFrance
CityAvignon
Period15/09/1418/09/14

Fingerprint

pressure vessels
toughness
hardening
fluence
embrittlement
reactors
steels
mechanical properties
nanoclusters
neutrons
hardness tests
curves
surveillance
flux (rate)
fracture strength
availability
voids
precipitates
solutes
chemical composition

Keywords

  • microstructure
  • reactor pressure vessel
  • steel

Cite this

Serrano, M., Bergner, F., Radiguet, B., Lim, J. H., Grovenor, C. R. M., Hernandez-Mayoral, M., ... Altstadt, E. (2014). Correlation between microstructural features and mechanical properties of irradiated LONGLIFE RPV steels. In Proceedings of Fontevraud 8
Serrano, M. ; Bergner, F. ; Radiguet, B. ; Lim, J. H. ; Grovenor, C. R. M. ; Hernandez-Mayoral, M. ; Meslin, E. ; Wilford, K. ; Van Renterghem, W. ; Kocik, J. ; Ortner, S. ; Viehrig, H. W. ; Chaouadi, R. ; Brumovsky, M. ; Hein, H. ; Gillemot, F. ; Todeschini, P. ; Planman, Tapio ; Ruoden, J. ; Altstadt, E. / Correlation between microstructural features and mechanical properties of irradiated LONGLIFE RPV steels. Proceedings of Fontevraud 8. 2014.
@inproceedings{c88815ebbff74b2188e0ee6fc8b73ea8,
title = "Correlation between microstructural features and mechanical properties of irradiated LONGLIFE RPV steels",
abstract = "The possibility of extending the operational life of reactor pressure vessels (RPV) up to 80 years presents the problem of the availability of materials irradiated at high neutron fluence and low neutron flux. The ability of the existing trend curves to predict high fluence embrittlement is a question of debate, and a critical analysis of these curves should be based on a consistent microstructural examination of irradiated materials. Within the LONGLIFE 7FWP, neutron irradiated RPV materials, relevant for long term operation, some of them coming from surveillance programs, have been characterized by means of a combination of microstructural techniques (APT, SANS, TEM) and mechanical tests (hardness, tensile, impact and fracture toughness). In this paper the analysis of the links between microstructural features (solute nanoclusters, dislocation loops and voids) and hardening and embrittlement measurements by mechanical testing, is presented. Current hardening models, based on the contribution of precipitates, or nanoclusters, seem to underestimate irradiation hardening for very high fluences, mainly when matrix damage (dislocation loops) is observed. Regarding chemical composition effects, the predominant role of Ni and the synergism between Ni-Mn and Si are also identified. Low-Cu alloys show a threshold value of radiation induced features to produce an effect on mechanical properties which calls for further in-depth analyses.",
keywords = "microstructure, reactor pressure vessel, steel",
author = "M. Serrano and F. Bergner and B. Radiguet and Lim, {J. H.} and Grovenor, {C. R. M.} and M. Hernandez-Mayoral and E. Meslin and K. Wilford and {Van Renterghem}, W. and J. Kocik and S. Ortner and Viehrig, {H. W.} and R. Chaouadi and M. Brumovsky and H. Hein and F. Gillemot and P. Todeschini and Tapio Planman and J. Ruoden and E. Altstadt",
note = "Project code: 36818",
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language = "English",
booktitle = "Proceedings of Fontevraud 8",

}

Serrano, M, Bergner, F, Radiguet, B, Lim, JH, Grovenor, CRM, Hernandez-Mayoral, M, Meslin, E, Wilford, K, Van Renterghem, W, Kocik, J, Ortner, S, Viehrig, HW, Chaouadi, R, Brumovsky, M, Hein, H, Gillemot, F, Todeschini, P, Planman, T, Ruoden, J & Altstadt, E 2014, Correlation between microstructural features and mechanical properties of irradiated LONGLIFE RPV steels. in Proceedings of Fontevraud 8. Fontevraud 8, Avignon, France, 15/09/14.

Correlation between microstructural features and mechanical properties of irradiated LONGLIFE RPV steels. / Serrano, M.; Bergner, F.; Radiguet, B.; Lim, J. H.; Grovenor, C. R. M.; Hernandez-Mayoral, M.; Meslin, E.; Wilford, K.; Van Renterghem, W.; Kocik, J.; Ortner, S.; Viehrig, H. W.; Chaouadi, R.; Brumovsky, M.; Hein, H.; Gillemot, F.; Todeschini, P.; Planman, Tapio; Ruoden, J.; Altstadt, E.

Proceedings of Fontevraud 8. 2014.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - Correlation between microstructural features and mechanical properties of irradiated LONGLIFE RPV steels

AU - Serrano, M.

AU - Bergner, F.

AU - Radiguet, B.

AU - Lim, J. H.

AU - Grovenor, C. R. M.

AU - Hernandez-Mayoral, M.

AU - Meslin, E.

AU - Wilford, K.

AU - Van Renterghem, W.

AU - Kocik, J.

AU - Ortner, S.

AU - Viehrig, H. W.

AU - Chaouadi, R.

AU - Brumovsky, M.

AU - Hein, H.

AU - Gillemot, F.

AU - Todeschini, P.

AU - Planman, Tapio

AU - Ruoden, J.

AU - Altstadt, E.

N1 - Project code: 36818

PY - 2014

Y1 - 2014

N2 - The possibility of extending the operational life of reactor pressure vessels (RPV) up to 80 years presents the problem of the availability of materials irradiated at high neutron fluence and low neutron flux. The ability of the existing trend curves to predict high fluence embrittlement is a question of debate, and a critical analysis of these curves should be based on a consistent microstructural examination of irradiated materials. Within the LONGLIFE 7FWP, neutron irradiated RPV materials, relevant for long term operation, some of them coming from surveillance programs, have been characterized by means of a combination of microstructural techniques (APT, SANS, TEM) and mechanical tests (hardness, tensile, impact and fracture toughness). In this paper the analysis of the links between microstructural features (solute nanoclusters, dislocation loops and voids) and hardening and embrittlement measurements by mechanical testing, is presented. Current hardening models, based on the contribution of precipitates, or nanoclusters, seem to underestimate irradiation hardening for very high fluences, mainly when matrix damage (dislocation loops) is observed. Regarding chemical composition effects, the predominant role of Ni and the synergism between Ni-Mn and Si are also identified. Low-Cu alloys show a threshold value of radiation induced features to produce an effect on mechanical properties which calls for further in-depth analyses.

AB - The possibility of extending the operational life of reactor pressure vessels (RPV) up to 80 years presents the problem of the availability of materials irradiated at high neutron fluence and low neutron flux. The ability of the existing trend curves to predict high fluence embrittlement is a question of debate, and a critical analysis of these curves should be based on a consistent microstructural examination of irradiated materials. Within the LONGLIFE 7FWP, neutron irradiated RPV materials, relevant for long term operation, some of them coming from surveillance programs, have been characterized by means of a combination of microstructural techniques (APT, SANS, TEM) and mechanical tests (hardness, tensile, impact and fracture toughness). In this paper the analysis of the links between microstructural features (solute nanoclusters, dislocation loops and voids) and hardening and embrittlement measurements by mechanical testing, is presented. Current hardening models, based on the contribution of precipitates, or nanoclusters, seem to underestimate irradiation hardening for very high fluences, mainly when matrix damage (dislocation loops) is observed. Regarding chemical composition effects, the predominant role of Ni and the synergism between Ni-Mn and Si are also identified. Low-Cu alloys show a threshold value of radiation induced features to produce an effect on mechanical properties which calls for further in-depth analyses.

KW - microstructure

KW - reactor pressure vessel

KW - steel

M3 - Conference article in proceedings

BT - Proceedings of Fontevraud 8

ER -

Serrano M, Bergner F, Radiguet B, Lim JH, Grovenor CRM, Hernandez-Mayoral M et al. Correlation between microstructural features and mechanical properties of irradiated LONGLIFE RPV steels. In Proceedings of Fontevraud 8. 2014