dK/da effects on the SCC growth rates of nickel base alloys in high-temperature water

被引：36

作者：

Chen, Kai ^{[1
]}

Wang, Jiamei ^{[1
]}

Du, Donghai ^{[1
]}

Andresen, Peter L. ^{[1
,2
]}

Zhang, Lefu ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai 200240, Peoples R China

[2] GE Global Res, 12204 Wildwood Pk Pl, Bakersfield, CA 93311 USA

来源：

JOURNAL OF NUCLEAR MATERIALS | 2018年 / 503卷

关键词：

dK/da; Stress corrosion cracking; Crack growth rate; High temperature water; STRESS-CORROSION CRACKING; MODEL;

D O I：

10.1016/j.jnucmat.2018.02.032

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of dK/da on crack growth behavior of nickel base alloys has been studied by conducting stress corrosion cracking tests under positive and negative dK/da loading conditions on Alloys 690, 600 and X-750 in high temperature water. Results indicate that positive dK/da accelerates the SCC growth rates, and the accelerating effect increases with dK/da and the initial CGR. The FRI model was found to underestimate the dK/da effect by similar to 100X, especially for strain hardening materials, and this underscores the need for improved insight and models for crack tip strain rate. The effect of crack tip strain rate and dK/dt in particular can explain the dK/da accelerating effect. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：13 / 21

页数：9

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