Stress corrosion cracking behavior of X80 steel in artificial seawater under controlled strain rate and applied potentials

Jeong, Daeho; Jung, Woojin; Kim, Young‐Ju; Goto, Masahiro; Kim, Sangshik

doi:10.1007/s12540-015-5132-0

Cited by 21 publications

(3 citation statements)

References 34 publications

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“…TWIP(twin induced plasticity) 효과에 의해 우수한 인 장강도와 연신율의 조합을 가지는 고망간강은 조선 및 해 양구조용 소재로써 활발히 연구개발되어 상용화에 이르고 있다 [1][2][3][4]. 조선/해양구조용 강재로써 안전한 사용을 위해 서는 해수분위기에서 우수한 응력부식균열(stress corrosion cracking, SCC) 저항성이 요구된다 [5,6]. 실제로 고망간강 은 조선/해양구조용 소재로 사용되는 STS304 및 STS316 과 같은 스테인리스강에 비해 우수한 응력부식균열 저항성 을 가진다고 보고되고 있다 [7,8] .…”

Section: 서 론unclassified

Effect of Cr and N on Stress Corrosion Cracking Behavior of Fe-18Mn Steel

Choi¹,

Kim²,

Sung³

et al. 2019

Korean J. Met. Mater.

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High-Mn steels developed for offshore industries require good resistance to stress corrosion cracking (SCC) in seawater. Elements like Cr and N are often added to improve the resistance to SCC. In this study, the SCC behavior of Fe18Mn3Cr0.1N and Fe19Mn19Cr0.6N steels in artificial seawater was examined. Slow strain rate tests were conducted at a nominal strain rate of 10-6 /sec in air and artificial seawater under anodic and cathodic applied potentials. The tensile ductility drop in artificial seawater was compared to air and evaluated as the resistance to SCC. It was found that both specimens showed intergranular cracking in artificial seawater under both anodic and cathodic applied potentials. The intergranular SCC was more severe under anodic applied potential than cathodic applied potential. However the sensitivity to SCC in artificial seawater was substantially reduced in Fe19Mn19Cr0.6N specimen with higher Cr and N content, as compared to the Fe18Mn3Cr0.1N specimen under both applied potentials. Potentiodynamic tests in artificial seawater showed an increase in pitting corrosion potential, rather than corrosion potential, with increasing Cr and N content in high-Mn steel. The SCC behavior of high-Mn steels with different Cr and N contents was discussed based on micrographic and fractographic observations.

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Section: 서 론unclassified

Effect of Cr and N on Stress Corrosion Cracking Behavior of Fe-18Mn Steel

Choi¹,

Kim²,

Sung³

et al. 2019

Korean J. Met. Mater.

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“…Stress corrosion cracking (SCC) and hydrogen-induced cracking (HIC) are major issues in steel pipelines and are known as the most important failure mechanisms in such systems [6][7][8][9]. SCC occurs when the combination of tensile stress and corrosive media develops cracks in metals [5], and hydrogen embrittlement (HE) is explained by the result of the degradation of the mechanical properties of metals, which result in a decrease in ductility, strength, and fracture resistance due to the presence of hydrogen within the material [10].…”

Section: Introductionmentioning

confidence: 99%

“…Mohtadi-Bonab et al [7] argued that hydrogen-induced cracks were not generated by oxide inclusions; rather, they mainly propagated in a transgranular mode. Jeong et al [8] proposed that stress corrosion cracking of X80 steel in seawater environments was highly affected by pits, hydrogen concentration, and hydrogen-induced cracking. Duarte et al [21] reported that improper water treatment generated corrosion pitting, which resulted in stress concentration sites for crack initiation, and the combination of corrosion pitting and residual stress generated stress corrosion cracking.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Embrittlement of a Boiler Water Wall Tube in a District Heating System

Kim

Jain

et al. 2022

Metals

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A district heating system is an eco-friendly power generation facility with high energy efficiency. The boiler water wall tube used in the district heating system is exposed to extremely harsh conditions, and unexpected fractures often occur during operation. In this study, a corrosion failure analysis of the boiler water wall tube was performed to elucidate the failure mechanisms. The study revealed that overheating by flames was the cause of the failure of the boiler water wall tube. With an increase in temperature in a localized region the microstructure not only changed from ferrite/pearlite to martensite/bainite, which made it more susceptible to brittleness, but it also developed tensile residual stresses in the water-facing side by generating cavities or microcracks along the grain boundaries inside the tube. High-temperature hydrogen embrittlement combined with stress corrosion cracking initiated many microcracks inside the tube and created an intergranular fracture.

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