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

Yiqi Zhou; Abdulaziz Kablan; Dirk Engelberg

doi:https://doi.org/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 - 8 Sep 2020

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

MPC: Materials Performance Centre
Burke, G., Engelberg, D., Preuss, M., Frankel, P., Jimenez-Melero, E., Pickering, E., Scenini, F., Stevens, N., Race, C., Connolly, B., Abdallah, M., Armson, S., Attar, H., Barron, P., Bird, J., Brown, A., Bruce, K., Buxton, O., Cassineri, S., Cattivelli, A., Chen, W., Collins, J., Debenham, L., Eaton-Mckay, J., Eguchi, K., Foster, D., Fox, C., Garrett, A., Gredis, A., Grime, T., Hou, J., Howe, B., Hughes, J., Hunt, C., Islam, U., Jalil, R., Jones, C., Kablan, A., Kapousidou, M., Koc, O., Kroll, R., Lang, R., Lennard, J., Liubercev, S., Mahmood, S., Maric, M., Martin, C., Mazzei, G., Rigby-Bell, M., Rogers, M., Sanchez, C., Shah, Z., Stavroulakis, E., Stuglik, P., Suleman, T., Supornpaibul, N., Thornley, S., Volpe, L., Wang, H., Wilson, M., Wilson, A., Woodward, T., Wylie, A., Xu, X. D., Yankova, M., Yildirim, E., Zhou, Y., Zhu, S., Barzdajn, B., Carruthers, A., Cassineri, S., Chang, L., Obasi, G., Palko, S., Reccagni, P., Tang, R., Thomas, R., Unnikrishnan, R., Zhang, Z., Zhou, Y. & Aspinall, A.
1/01/02 → …
Project: Research

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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.",

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

year = "2020",

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volume = "169",

journal = "Materials Characterization",

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T1 - Metallographic Screening of Duplex Stainless Steel Weld Microstructure with a Bipolar Electrochemistry Technique

AU - Zhou, Yiqi

AU - Kablan, Abdulaziz

AU - Engelberg, Dirk

PY - 2020/9/8

Y1 - 2020/9/8

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.

U2 - https://doi.org/10.1016/j.matchar.2020.110605

DO - https://doi.org/10.1016/j.matchar.2020.110605

M3 - Article

VL - 169

JO - Materials Characterization

JF - Materials Characterization

SN - 1044-5803

M1 - 110605

ER -

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

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