Liang Lv , Jingxuan Zhuo , Yifan Du, Kai Chen, Guiming Dang, Haoyun Xu, Haoran Gao, Yongxiang Guo, Shuqi Zheng
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引用次数: 0
Abstract
Currently, pipeline transportation is the most economical and safe method for transporting natural gas. X65 is one of the most commonly used steel grades for offshore oil and gas pipelines. While transporting of high-pressure hydrogen is efficient and economical, harsh natural environments, such as the continuous seawater fluctuation, can cause cyclic loading on the pipeline. Therefore, the effect of hydrogen and fatigue loading on X65 pipeline steel cannot be ignored. This study aims to explore the effects of hydrogen and air environments on crack initiation and propagation. Initially, tests on fatigue life and crack growth rate are performed in H2, in addition, scanning electron microscopy and electron backscatter diffraction analyses are conducted on the specimens. Results, indicate that crack initiation is influenced by the microstructure of X65 pipeline steel with inclusions acting as the source of crack initiation, and pearlite affecting the trend of crack propagation. Hydrogen exposure decreases the fatigue life in comparison with that in air by 85.5 % and increases the crack growth rate in comparison with that in air by approximately 20 times. In the air environment the distance between the stress-concentration region and the crack tip is almost equal to the size of two grains. In H2, the cracks deflect because of the rapid growth, and the deflected cracks divide the stress concentration area. This study provides insights into the effects of hydrogen and microstructure on the fatigue properties of X65 pipeline steel, offering a theoretical basis for future studies under different conditions.
期刊介绍：
Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies.
This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.
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