Novel images of the evolution of stress corrosion cracks from corrosion pits

被引：191

作者：

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

Connolly, B. J. ^{[1
]}

Zhou, S. ^{[2
]}

Crocker, L. ^{[2
]}

Turnbull, A. ^{[2
]}

机构：

[1] Univ Birmingham, Birmingham B15 2TT, W Midlands, England

[2] Natl Phys Lab, Teddington TW11 0LW, Middx, England

来源：

CORROSION SCIENCE | 2011年 / 53卷 / 11期

基金：

英国工程与自然科学研究理事会;

关键词：

Low alloy steel; Pitting corrosion; Stress Corrosion; X-RAY MICROTOMOGRAPHY; STAINLESS-STEEL FOILS; SHORT FATIGUE-CRACK; LOCALIZED CORROSION; INITIATION; TOMOGRAPHY; TRANSITION; VISUALIZATION; ENVIRONMENT; NUCLEATION;

D O I：

10.1016/j.corsci.2011.05.050

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

SCC in turbine disc steels exposed to simulated steam-condensate tends to nucleate preferentially from corrosion pit precursors. The evolution of these cracks is not straightforward and not well understood. In this work, unique three-dimensional X-ray microtomographic images have confirmed that cracks develop predominantly at the shoulder of the pit, near the pit/surface interface, for specimens stressed to 50-90% sigma(0.2). In support of this observation, FEA of model pits indicate that strain is a maximum on the pit wall just below the pit mouth. Implications of these observations for the pit-to-crack transition and predictive-modelling of crack nucleation and growth are discussed. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：3466 / 3485

页数：20

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