Effect of cathodic potentials on the SCC behavior of E690 steel in simulated seawater

Hongchi Ma; Zhiyong Liu; Cuiwei Du; Huiru Wang; Caiyu Li; Xiaogang Li

doi:10.1016/j.msea.2015.05.109

Effect of cathodic potentials on the SCC behavior of E690 steel in simulated seawater

Hongchi Ma
, Zhiyong Liu
, Cuiwei Du^*
, Huiru Wang
, Caiyu Li
, Xiaogang Li

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

132 Scopus citations

Abstract

Slow strain rate tensile tests, combined with fracture morphology observation and electrochemical measurements, were conducted to investigate the SCC behavior of E690 steel in simulated seawater at open circuit potential (OCP) and various cathodic potentials. Results showed that E690 steel had a certain degree of SCC susceptibility at OCP in simulated seawater and had a high susceptibility to hydrogen embrittlement (HE) at high cathodic potentials. The SCC susceptibility showed a distinct decline at -850mV_SCE because of the inhibition of the anodic dissolution, and the fracture surface exhibited a ductile failure of dimple. The SCC susceptibility presented a remarkable increase at -950mV_SCE with a distinct feature of brittle rupture and increased drastically as the potential became more negative. The bainitic lath boundaries had an opposite effect on the SCC behaviors of E690 steel. The fracture modes at OCP and various cathodic potentials were all transgranular cracking.

Original language	English
Pages (from-to)	22-31
Number of pages	10
Journal	Materials Science and Engineering: A
Volume	642
DOIs	https://doi.org/10.1016/j.msea.2015.05.109
State	Published - 6 Aug 2015
Externally published	Yes

Keywords

Bainitic high-strength steel
Cathodic potential
Hydrogen embrittlement
Simulated seawater
Stress corrosion cracking (SCC)

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10.1016/j.msea.2015.05.109

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title = "Effect of cathodic potentials on the SCC behavior of E690 steel in simulated seawater",

abstract = "Slow strain rate tensile tests, combined with fracture morphology observation and electrochemical measurements, were conducted to investigate the SCC behavior of E690 steel in simulated seawater at open circuit potential (OCP) and various cathodic potentials. Results showed that E690 steel had a certain degree of SCC susceptibility at OCP in simulated seawater and had a high susceptibility to hydrogen embrittlement (HE) at high cathodic potentials. The SCC susceptibility showed a distinct decline at -850mVSCE because of the inhibition of the anodic dissolution, and the fracture surface exhibited a ductile failure of dimple. The SCC susceptibility presented a remarkable increase at -950mVSCE with a distinct feature of brittle rupture and increased drastically as the potential became more negative. The bainitic lath boundaries had an opposite effect on the SCC behaviors of E690 steel. The fracture modes at OCP and various cathodic potentials were all transgranular cracking.",

keywords = "Bainitic high-strength steel, Cathodic potential, Hydrogen embrittlement, Simulated seawater, Stress corrosion cracking (SCC)",

author = "Hongchi Ma and Zhiyong Liu and Cuiwei Du and Huiru Wang and Caiyu Li and Xiaogang Li",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

year = "2015",

month = aug,

day = "6",

doi = "10.1016/j.msea.2015.05.109",

language = "英语",

volume = "642",

pages = "22--31",

journal = "Materials Science and Engineering: A",

issn = "0921-5093",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Effect of cathodic potentials on the SCC behavior of E690 steel in simulated seawater

AU - Ma, Hongchi

AU - Liu, Zhiyong

AU - Du, Cuiwei

AU - Wang, Huiru

AU - Li, Caiyu

AU - Li, Xiaogang

PY - 2015/8/6

Y1 - 2015/8/6

N2 - Slow strain rate tensile tests, combined with fracture morphology observation and electrochemical measurements, were conducted to investigate the SCC behavior of E690 steel in simulated seawater at open circuit potential (OCP) and various cathodic potentials. Results showed that E690 steel had a certain degree of SCC susceptibility at OCP in simulated seawater and had a high susceptibility to hydrogen embrittlement (HE) at high cathodic potentials. The SCC susceptibility showed a distinct decline at -850mVSCE because of the inhibition of the anodic dissolution, and the fracture surface exhibited a ductile failure of dimple. The SCC susceptibility presented a remarkable increase at -950mVSCE with a distinct feature of brittle rupture and increased drastically as the potential became more negative. The bainitic lath boundaries had an opposite effect on the SCC behaviors of E690 steel. The fracture modes at OCP and various cathodic potentials were all transgranular cracking.

AB - Slow strain rate tensile tests, combined with fracture morphology observation and electrochemical measurements, were conducted to investigate the SCC behavior of E690 steel in simulated seawater at open circuit potential (OCP) and various cathodic potentials. Results showed that E690 steel had a certain degree of SCC susceptibility at OCP in simulated seawater and had a high susceptibility to hydrogen embrittlement (HE) at high cathodic potentials. The SCC susceptibility showed a distinct decline at -850mVSCE because of the inhibition of the anodic dissolution, and the fracture surface exhibited a ductile failure of dimple. The SCC susceptibility presented a remarkable increase at -950mVSCE with a distinct feature of brittle rupture and increased drastically as the potential became more negative. The bainitic lath boundaries had an opposite effect on the SCC behaviors of E690 steel. The fracture modes at OCP and various cathodic potentials were all transgranular cracking.

KW - Bainitic high-strength steel

KW - Cathodic potential

KW - Hydrogen embrittlement

KW - Simulated seawater

KW - Stress corrosion cracking (SCC)

UR - https://www.scopus.com/pages/publications/84934269362

U2 - 10.1016/j.msea.2015.05.109

DO - 10.1016/j.msea.2015.05.109

M3 - 文章

AN - SCOPUS:84934269362

SN - 0921-5093

VL - 642

SP - 22

EP - 31

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

ER -

Effect of cathodic potentials on the SCC behavior of E690 steel in simulated seawater

Abstract

Keywords

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