Growth Behavior of Stress Corrosion Cracks of X80 Pipeline Steel in Underground Water of Acidic Soil

被引:12
|
作者
Wang, X. Z. [1 ]
Liu, Z. Y. [1 ]
Ge, X. [2 ]
Zhan, X. L. [1 ]
Du, C. W. [1 ]
Li, X. G. [1 ]
机构
[1] Univ Sci & Technol Beijing, Ctr Corros & Protect, Beijing 100083, Peoples R China
[2] Jilin Oilfield Util Management Co Ltd, Songyuan 138000, Peoples R China
关键词
acidic soil solution; crack propagation behavior; stress corrosion cracking; X80 pipeline steel; NEUTRAL-PH SCC; RESIDUAL-STRESS; ENVIRONMENT; MODEL; X70; HYDROGEN; STRAIN; TIP;
D O I
10.5006/1094
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The growth behavior of stress corrosion cracks of X80 pipeline steel in the underground water of acidic soil environments was investigated by a slow-rate-loading crack growth test, electrochemical polarization curves, electrochemical impedance spectroscopy, and scanning electron microscopy. Crack growth mechanism was mixed-controlled by both anodic dissolution and hydrogen involvement. Ductile cracking first occurred and crack growth was primarily based on the anodic dissolution mechanism. Crack propagation gradually changed from ductile cracking to brittle cracking. Crack growth rate significantly accelerated with decreasing solution pH; crack propagation followed a hydrogen-based mechanism during the quick crack propagation stage.
引用
收藏
页码:872 / 879
页数:8
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