Complex study of grain boundary segregation in long-term irradiated reactor pressure vessel steels

被引：20

作者：

Fedotova, S., V ^{[1
]}

Kuleshova, E. A. ^{[1
,2
]}

Maltsev, D. A. ^{[1
]}

Saltykov, M. A. ^{[1
]}

机构：

[1] Kurchatov Inst, Natl Res Ctr, Moscow, Russia

[2] Natl Res Nucl Univ MEPhI, Moscow Engn Phys Inst, Moscow, Russia

来源：

JOURNAL OF NUCLEAR MATERIALS | 2020年 / 528卷

关键词：

Reactor pressure vessel steel; Grain boundary segregation; Atom probe tomography; Auger electron spectroscopy; Fractographic analysis; ATOM-PROBE TOMOGRAPHY; INTERGRANULAR FRACTURE; ALLOYING ELEMENTS; FE-P; PHOSPHORUS; THERMODYNAMICS; EMBRITTLEMENT; IRON; MO;

D O I：

10.1016/j.jnucmat.2019.151865

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Grain boundary (GB) embrittlement of reactor pressure vessel steel occurs at the long-term operation through the radiation-enhanced segregation of impurities. All the known techniques of studying the GB segregation have their advantages and disadvantages, and complete information can be obtained only through a comprehensive analysis by different methods. In this paper the level of GB segregation in VVER-1000 RPV steels with high nickel content was assessed by combined methods of Auger electron spectroscopy (by the P monolayer coverage and atomic concentration of other elements); atom probe tomography (by the Gibbsian interfacial excess) and fractographic analysis (by the maximum fraction of brittle intergranular fracture). The results obtained by different methods are in good agreement and show that phosphorus GB segregation increases with the increase of fast neutron fluence, GB concentration of Ni and Mn, the bulk concentration of Ni and Mn, and correlates with the fraction of brittle intergranular fracture. (C) 2019 Elsevier B.V. All rights reserved.

引用

页数：8

共 40 条

[1] Investigation of the dependence of phosphorus segregation on grain boundary structure in Fe-P-C alloy:.ross comparison between Atom Probe Tomography and Auger Electron Spectroscopy [J].