Influence of operation factors on brittle fracture initiation and critical local normal stress in SE(B) type specimens of VVER reactor pressure vessel steels

被引：2

作者：

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

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

Kiselev, A. S. ^{[1
]}

Bubyakin, S. A. ^{[1
]}

Bandura, A. P. ^{[1
]}

机构：

[1] NRC Kurchatov Inst, Moscow 123182, Russia

[2] Natl Res Nucl Univ MEPhI, Moscow Engn Phys Inst, Moscow 115409, Russia

来源：

JOURNAL OF NUCLEAR MATERIALS | 2015年 / 467卷

关键词：

Reactor pressure vessel; Fracture toughness; Brittle fracture origin; SEM fractography; Cleavage initiation distance; Local approach; PHOSPHORUS SEGREGATION; CLEAVAGE FRACTURE; CRITERION; KINETICS;

D O I：

10.1016/j.jnucmat.2015.10.037

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A complex of mechanical tests and fractographic studies of VVER-1000 RPV SE(B) type surveillance specimens was carried out: the brittle fracture origins were revealed (non-metallic inclusions and structural boundaries) and the correlation between fracture toughness parameters (CTOD) and fracture surface parameters (CID) was established. A computational and experimental method of the critical local normal stress determination for different origin types was developed. The values of the critical local normal stress for the structural boundary origin type both for base and weld metal after thermal exposure and neutron irradiation are lower than that for initial state due to the lower cohesive strength of grain boundaries as a result of phosphorus segregation. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：927 / 936

页数：10

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