A study on the diffusion-induced grain boundary migration ahead of stress corrosion cracking crack tips through advanced characterization

被引：15
|
作者：
Shen, Zhao [1 ]
Arioka, Koji [2 ]
Lozano-Perez, Sergio [1 ]
机构：
[1] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England
[2] Inst Nucl Safety Syst Inc INSS, 64 Sata,Mihama Cho, Fuki, Mihama 9191205, Japan
来源：
CORROSION SCIENCE | 2021年 / 183卷
基金：
英国工程与自然科学研究理事会;
关键词：
Austenitic alloy; Stress corrosion cracking; Diffusion-induced grain boundary migration; Chemical diffusion; Transmission electron microscopy;
D O I：
10.1016/j.corsci.2021.109328
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Three austenitic alloys with different Ni content were stress corrosion cracking (SCC) tested in simulated pressurized water reactor (PWR) primary water at 320 and 360 ?C. Diffusion-induced grain boundary migration (DIGM) associated with preferential intergranular oxidation (PIO) is observed ahead of all SCC crack tips. The occurrence of DIGM is revealed to be driven by PIO-induced diffusion of Cr, Fe, and Ni. The extent of DIGM is controlled by the lateral and in-depth elemental diffusion and PIO, with these processes interconnected. Temperature and alloy composition are revealed to affect the extent of DIGM by affecting these processes.
引用
收藏
页数：15
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