Precipitate evolution in low-nickel austenitic stainless steels during neutron irradiation at very low dose rates

被引：21

作者：

Isobe, Y. ^{[1
]}

Sagisaka, M. ^{[1
]}

Garner, F. A. ^{[2
]}

Fujita, S. ^{[3
]}

Okita, T. ^{[3
]}

机构：

[1] Nucl Fuels Ltd, Osaka, Japan

[2] Pacific NW Natl Lab, Richland, WA 99352 USA

[3] Univ Tokyo, Tokyo, Japan

来源：

JOURNAL OF NUCLEAR MATERIALS | 2009年 / 386-88卷

关键词：

MICROSTRUCTURAL EVOLUTION; DPA;

D O I：

10.1016/j.jnucmat.2008.12.255

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Neutron-induced microstructural evolution in response to long term irradiation at very low dose rates was studied for a Russian low-nickel austenitic stainless steel designated X18H9 that is analogous to AISI 304. The irradiated samples were obtained from an out-of-core support column for the pressure vessel of the BN-600 fast reactor with doses ranging from 1.7 to 20.5 dpa generated at 3.8 x 10(-9) to 4.3 x 10(-8) dpa/s. The irradiation temperatures were in a very narrow range of 370-375 degrees C. Microstructural observation showed that in addition to voids and dislocations, an unexpectedly high density of small G-phase precipitates was formed that are not usually observed at higher dpa rates in this temperature range. A similar behavior was observed in a Western stainless steel, namely AISI 304 stainless steel, irradiated at similar temperatures and somewhat higher dpa rates in the EBR-II fast reactor, indicating that irradiation at low dpa rates for many years can lead to a different precipitate microstructure and therefore different associated changes in matrix composition than are generated at higher dpa rates. The contribution of such radiation-induced precipitation to changes in electrical resistivity was measured in the X18H9 specimens and was shown to cause significant deviation from predictions based only on void swelling. (c) 2009 Elsevier B.V. All rights reserved.

引用

页码：661 / 665

页数：5

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