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Titolo:
Effects of thermal sensitization on radiation-induced segregation in type 304 stainless steel irradiated with He-ions
Autore:
Okada, O; Nakata, K; Kasahara, S;
Indirizzi:
HitachiIbarakiitachi Res Lab, Dept Mat Res 2, Nucl Plant Mat Grp, Hitachi,Hitachi Ltd Hitachi Ibaraki Japan 3178511 2, Nucl Plant Mat Grp, Hitachi,
Titolo Testata:
JOURNAL OF NUCLEAR MATERIALS
fascicolo: 3, volume: 265, anno: 1999,
pagine: 232 - 239
SICI:
0022-3115(19990301)265:3<232:EOTSOR>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRACKING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Okada, O HitachiiLtd, Hitachi Res Lab, Dept Mat Res 2, Nucl Plant Mat Grp,1-1 Saiwa Hitachi Ltd 1-1 Saiwai Cho 3 Chome Hitachi Ibaraki Japan 3178511
Citazione:
O. Okada et al., "Effects of thermal sensitization on radiation-induced segregation in type 304 stainless steel irradiated with He-ions", J NUCL MAT, 265(3), 1999, pp. 232-239

Abstract

Type 304 stainless steels, solution-annealed and thermally sensitized at 923 K for 0.5 to 24 h, were He-ion-irradiated up to about 4 dpa at 723 K andradiation-induced segregation (RIS) at grain boundaries was measured by EDS analysis using a FEG-TEM. Ni, Si and P were enriched, and Cr was depletedat the grain boundaries by irradiation. However, although the irradiation dose was the same for the specimens, the RIS of the elements linearly increased with the logarithm of the thermally sensitizing time, except for Cr inthe specimen thermally sensitized for 24 h. The enhancement of RIS was attributed to the radiation-induced point defects having large mobility in thermally sensitized stainless steels, because of an expected decrease in C near the grain boundaries and in the matrix after the sensitization heat treatments. It was clarified by the electrochemical potentiokinetic reactivation test (EPR) that the degree of sensitization increased with the progress of Cr depletion at grain boundaries. The Cr concentration at grain boundaries in the heavily sensitized specimen was not changed, and the width of the depleted area was slightly narrowed by the irradiation. This result could be explained that the diffusion of Cr due to initial Cr concentration gradient near grain boundaries exceeded the inverse Kirkendall effect. (C) 1999 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 03:38:39