Stress Corrosion Cracking of Linepipe Steels in Near-Neutral pH Environment: A Review of the Effects of Stress

2008 ◽  
pp. 473-473-11 ◽  
Author(s):  
W Zheng ◽  
R Sutherby ◽  
RW Revie ◽  
WR Tyson ◽  
G Shen
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Neutral Ph ◽  
Effects Of Stress ◽  
Linepipe Steels

Initiation of Stress Corrosion Cracking on X-65 Linepipe Steels in Near-Neutral pH Environment

2000 ◽  
Author(s):  
M. Elboujdaini ◽  
Y.-Z. Wang ◽  
R. W. Revie
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Early Growth ◽  
Corrosion Cracking ◽  
Second Phase ◽  
Neutral Ph ◽  
Micro Cracks ◽  
Second Phase Particles ◽  
Corrosion Pits ◽  
Linepipe Steels

Initiation and early growth of stress-corrosion cracking of X-65 linepipe steel in near-neutral pH environment were studied in NS-4 solution saturated with N2/5%CO2. The occurrence of SCC is discussed in terms of: 1. Generation of an environment that causes cracks to initiate; 2. Initiation and early growth of cracks; and 3. Effect of the mechanical loading spectrum. SEM observations of cracks at specimen surfaces showed that stress-corrosion cracks were initiated at bottoms of corrosion pits. Pits that lead to initiation of SCC can develop from surface discontinuities, which can be geometrical, such as surface roughness, or metallurgical, such as inclusions, second phase particles, etc. The formation of large cracks resulting from coalescence of micro-cracks was studied.

Modeling the Interactions of Hydrogen, Stress and Dissolution in Near-Neutral pH Stress Corrosion Cracking of Pipelines

2006 ◽  
Author(s):  
Frank Y. Cheng
Keyword(s):  
Stress Corrosion ◽  
Dissolution Rate ◽  
Crack Growth ◽  
Anodic Dissolution ◽  
Hydrogen Concentration ◽  
Stress Corrosion Cracking ◽  
Crack Tip ◽  
Corrosion Cracking ◽  
Neutral Ph ◽  
Ph Stress

A thermodynamic model was developed to determine the interactions of hydrogen, stress and anodic dissolution at the crack-tip during near-neutral pH stress corrosion cracking in pipelines. By analyzing the free-energy of the steel in the presence and absence of hydrogen and stress, it is demonstrated that a synergism of hydrogen and stress promotes the cracking of the steel. The enhanced hydrogen concentration in the stressed steel significantly accelerates the crack growth. The quantitative prediction of the crack growth rate in near-neutral pH environment is based on the determination of the effect of hydrogen on the anodic dissolution rate in the absence of stress, the effect of stress on the anodic dissolution rate in the absence of hydrogen, the synergistic effect of hydrogen and stress on the anodic dissolution rate at the crack-tip and the effect of the variation of hydrogen concentration on the anodic dissolution rate.

scholarly journals Influence of the ultrasonic surface rolling process on stress corrosion cracking susceptibility of high strength pipeline steel in neutral pH environment

RSC Advances ◽  
2017 ◽  
Vol 7 (59) ◽  
pp. 36876-36885 ◽  
Author(s):  
Bingying Wang ◽  
Yu Yin ◽  
Zhiwei Gao ◽  
Zhenbo Hou ◽  
Wenchun Jiang
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Pipeline Steel ◽  
High Strength ◽  
Rolling Process ◽  
Corrosion Cracking ◽  
X80 Pipeline Steel ◽  
Enhancement Technique ◽  
Neutral Ph ◽  
Developed Surface

A developed surface enhancement technique, USRP, was applied on X80 pipeline steel and the stress corrosion cracking susceptibility was studied.

Hydrogen in stress corrosion cracking of X-70 pipeline steels in near-neutral pH solutions

2006 ◽  
Vol 41 (6) ◽  
pp. 1797-1803 ◽  
Author(s):  
Bingyan Fang ◽  
En-Hou Han ◽  
Jianqiu Wang ◽  
Ziyong Zhu ◽  
We Ke
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Pipeline Steels ◽  
Neutral Ph
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