Metallographic Screening of Duplex Stainless Steel Weld Microstructure with a Bipolar Electrochemistry Technique

Yiqi Zhou; Abdulaziz Kablan; Dirk Engelberg

doi:10.1016/j.matchar.2020.110605

Metallographic Screening of Duplex Stainless Steel Weld Microstructure with a Bipolar Electrochemistry Technique

Yiqi Zhou, Abdulaziz Kablan, Dirk Engelberg

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Abstract

A novel bipolar electrochemistry screening method to reveal corrosion susceptibility of weld microstructures is introduced. This metallographic method is applied to characterise the weld microstructure of a lean duplex stainless steel. The corrosion behaviour of the Fusion Zone (FZ), Heat Affected Zone (HAZ) and Base Metal (BM) was revealed, with the most severe etch response found at the interface between Fusion Zone (FZ) – Heat Affected Zone (HAZ). Transpassive and crevice corrosion were more significant in the FZ, with the highest corrosion resistance observed in the BM. The observed behaviour was linked to differences in local element distributions and the ferrite-to-austenite phase fraction. Corrosion pits formed via preferential dissolution of the ferrite, with the austenite preferentially dissolving in the transpassive region.

Original language	English
Article number	110605
Journal	Materials Characterization
Volume	169
DOIs	https://doi.org/10.1016/j.matchar.2020.110605
Publication status	Published - Nov 2020

Keywords

Bipolar electrochemistry
Corrosion screening
Heat affected zone
Stainless steel
Weld microstructure

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Metallographic Screening of a Lean Duplex Stainless Steel Weld Accepted author manuscript, 9.7 MB

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title = "Metallographic Screening of Duplex Stainless Steel Weld Microstructure with a Bipolar Electrochemistry Technique",

abstract = "A novel bipolar electrochemistry screening method to reveal corrosion susceptibility of weld microstructures is introduced. This metallographic method is applied to characterise the weld microstructure of a lean duplex stainless steel. The corrosion behaviour of the Fusion Zone (FZ), Heat Affected Zone (HAZ) and Base Metal (BM) was revealed, with the most severe etch response found at the interface between Fusion Zone (FZ) – Heat Affected Zone (HAZ). Transpassive and crevice corrosion were more significant in the FZ, with the highest corrosion resistance observed in the BM. The observed behaviour was linked to differences in local element distributions and the ferrite-to-austenite phase fraction. Corrosion pits formed via preferential dissolution of the ferrite, with the austenite preferentially dissolving in the transpassive region.",

keywords = "Bipolar electrochemistry, Corrosion screening, Heat affected zone, Stainless steel, Weld microstructure",

author = "Yiqi Zhou and Abdulaziz Kablan and Dirk Engelberg",

note = "Funding Information: The authors acknowledge the support of the Henry Royce Institute for access to the ZEISS Sigma FEG-SEM and Keyence laser scanning confocal microscope at Royce@Manchester (EP/R00661X/1). AK also acknowledges financial support by Sellafield Ltd. and the EPSRC Centre for Doctoral Training in Advanced Metallic Systems ( EP/L016273/1 ). Funding Information: The authors acknowledge the support of the Henry Royce Institute for access to the ZEISS Sigma FEG-SEM and Keyence laser scanning confocal microscope at Royce@Manchester (EP/R00661X/1). AK also acknowledges financial support by Sellafield Ltd. and the EPSRC Centre for Doctoral Training in Advanced Metallic Systems (EP/L016273/1). Publisher Copyright: {\textcopyright} 2020 Elsevier Inc.",

year = "2020",

month = nov,

doi = "10.1016/j.matchar.2020.110605",

language = "English",

volume = "169",

journal = "Materials Characterization",

issn = "1044-5803",

publisher = "Elsevier BV",

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AU - Zhou, Yiqi

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AU - Engelberg, Dirk

N1 - Funding Information: The authors acknowledge the support of the Henry Royce Institute for access to the ZEISS Sigma FEG-SEM and Keyence laser scanning confocal microscope at Royce@Manchester (EP/R00661X/1). AK also acknowledges financial support by Sellafield Ltd. and the EPSRC Centre for Doctoral Training in Advanced Metallic Systems ( EP/L016273/1 ). Funding Information: The authors acknowledge the support of the Henry Royce Institute for access to the ZEISS Sigma FEG-SEM and Keyence laser scanning confocal microscope at Royce@Manchester (EP/R00661X/1). AK also acknowledges financial support by Sellafield Ltd. and the EPSRC Centre for Doctoral Training in Advanced Metallic Systems (EP/L016273/1). Publisher Copyright: © 2020 Elsevier Inc.

PY - 2020/11

Y1 - 2020/11

N2 - A novel bipolar electrochemistry screening method to reveal corrosion susceptibility of weld microstructures is introduced. This metallographic method is applied to characterise the weld microstructure of a lean duplex stainless steel. The corrosion behaviour of the Fusion Zone (FZ), Heat Affected Zone (HAZ) and Base Metal (BM) was revealed, with the most severe etch response found at the interface between Fusion Zone (FZ) – Heat Affected Zone (HAZ). Transpassive and crevice corrosion were more significant in the FZ, with the highest corrosion resistance observed in the BM. The observed behaviour was linked to differences in local element distributions and the ferrite-to-austenite phase fraction. Corrosion pits formed via preferential dissolution of the ferrite, with the austenite preferentially dissolving in the transpassive region.

AB - A novel bipolar electrochemistry screening method to reveal corrosion susceptibility of weld microstructures is introduced. This metallographic method is applied to characterise the weld microstructure of a lean duplex stainless steel. The corrosion behaviour of the Fusion Zone (FZ), Heat Affected Zone (HAZ) and Base Metal (BM) was revealed, with the most severe etch response found at the interface between Fusion Zone (FZ) – Heat Affected Zone (HAZ). Transpassive and crevice corrosion were more significant in the FZ, with the highest corrosion resistance observed in the BM. The observed behaviour was linked to differences in local element distributions and the ferrite-to-austenite phase fraction. Corrosion pits formed via preferential dissolution of the ferrite, with the austenite preferentially dissolving in the transpassive region.

KW - Bipolar electrochemistry

KW - Corrosion screening

KW - Heat affected zone

KW - Stainless steel

KW - Weld microstructure

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DO - 10.1016/j.matchar.2020.110605

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JO - Materials Characterization

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Metallographic Screening of Duplex Stainless Steel Weld Microstructure with a Bipolar Electrochemistry Technique

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Keywords

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MPC: Materials Performance Centre

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Metallographic Screening of Duplex Stainless Steel Weld Microstructure with a Bipolar Electrochemistry Technique

Abstract

Keywords

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MPC: Materials Performance Centre

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