Effect of microstructure on KCl corrosion attack of modified AISI 310 steel

Yohanes Chekol Malede*, Melanie Montgomery, Kristian Vinter Dahl, John Hald

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The effect of microstructure on KCl corrosion attack was studied using a specifically chosen modified AISI 310 austenitic steel in a 15% (v/v) H2O (g)+ 5%(v/v) O2 (g) + N2 (g) (balance) atmosphere at 600°C for 168 h. The material was a targeted choice as it allows investigation of different microstructures i.e. as-received (without sigma phase) and heat-treated (29% σ-phase per area) microstructures. The corrosion attack was studied with light optical, scanning electron and transmission electron microscopy as well as X-ray diffraction. The heat-treated sample showed a corrosion attack that was 5 times higher than the as-received sample. In the heat-treated sample, the σ-phase was selectively attacked. At the corrosion front, chlorine (but not potassium) was detected in the selectively attacked σ- phase but not in the unattacked adjacent matrix. Therefore, the corrosion attack was propagated by preferential σ-phase attack by chlorine species.
Original languageEnglish
JournalMaterials at High Temperatures
Volume35
Issue number1-3
Pages (from-to)243-254
ISSN0960-3409
DOIs
Publication statusPublished - 2018

Keywords

  • Internal corrosion
  • Effect of microstructure
  • KCl corrosion
  • Modified 310 steel
  • High temperature corrosion
  • Sigma-phase

Cite this

@article{75910e0d95b54947b6b7b7da26d977f1,
title = "Effect of microstructure on KCl corrosion attack of modified AISI 310 steel",
abstract = "The effect of microstructure on KCl corrosion attack was studied using a specifically chosen modified AISI 310 austenitic steel in a 15{\%} (v/v) H2O (g)+ 5{\%}(v/v) O2 (g) + N2 (g) (balance) atmosphere at 600°C for 168 h. The material was a targeted choice as it allows investigation of different microstructures i.e. as-received (without sigma phase) and heat-treated (29{\%} σ-phase per area) microstructures. The corrosion attack was studied with light optical, scanning electron and transmission electron microscopy as well as X-ray diffraction. The heat-treated sample showed a corrosion attack that was 5 times higher than the as-received sample. In the heat-treated sample, the σ-phase was selectively attacked. At the corrosion front, chlorine (but not potassium) was detected in the selectively attacked σ- phase but not in the unattacked adjacent matrix. Therefore, the corrosion attack was propagated by preferential σ-phase attack by chlorine species.",
keywords = "Internal corrosion, Effect of microstructure, KCl corrosion, Modified 310 steel, High temperature corrosion, Sigma-phase",
author = "Malede, {Yohanes Chekol} and Melanie Montgomery and Dahl, {Kristian Vinter} and John Hald",
year = "2018",
doi = "10.1080/09603409.2017.1389381",
language = "English",
volume = "35",
pages = "243--254",
journal = "Materials at High Temperatures",
issn = "0960-3409",
publisher = "CRC Press/Balkema",
number = "1-3",

}

Effect of microstructure on KCl corrosion attack of modified AISI 310 steel. / Malede, Yohanes Chekol; Montgomery, Melanie; Dahl, Kristian Vinter; Hald, John.

In: Materials at High Temperatures, Vol. 35, No. 1-3, 2018, p. 243-254.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Effect of microstructure on KCl corrosion attack of modified AISI 310 steel

AU - Malede, Yohanes Chekol

AU - Montgomery, Melanie

AU - Dahl, Kristian Vinter

AU - Hald, John

PY - 2018

Y1 - 2018

N2 - The effect of microstructure on KCl corrosion attack was studied using a specifically chosen modified AISI 310 austenitic steel in a 15% (v/v) H2O (g)+ 5%(v/v) O2 (g) + N2 (g) (balance) atmosphere at 600°C for 168 h. The material was a targeted choice as it allows investigation of different microstructures i.e. as-received (without sigma phase) and heat-treated (29% σ-phase per area) microstructures. The corrosion attack was studied with light optical, scanning electron and transmission electron microscopy as well as X-ray diffraction. The heat-treated sample showed a corrosion attack that was 5 times higher than the as-received sample. In the heat-treated sample, the σ-phase was selectively attacked. At the corrosion front, chlorine (but not potassium) was detected in the selectively attacked σ- phase but not in the unattacked adjacent matrix. Therefore, the corrosion attack was propagated by preferential σ-phase attack by chlorine species.

AB - The effect of microstructure on KCl corrosion attack was studied using a specifically chosen modified AISI 310 austenitic steel in a 15% (v/v) H2O (g)+ 5%(v/v) O2 (g) + N2 (g) (balance) atmosphere at 600°C for 168 h. The material was a targeted choice as it allows investigation of different microstructures i.e. as-received (without sigma phase) and heat-treated (29% σ-phase per area) microstructures. The corrosion attack was studied with light optical, scanning electron and transmission electron microscopy as well as X-ray diffraction. The heat-treated sample showed a corrosion attack that was 5 times higher than the as-received sample. In the heat-treated sample, the σ-phase was selectively attacked. At the corrosion front, chlorine (but not potassium) was detected in the selectively attacked σ- phase but not in the unattacked adjacent matrix. Therefore, the corrosion attack was propagated by preferential σ-phase attack by chlorine species.

KW - Internal corrosion

KW - Effect of microstructure

KW - KCl corrosion

KW - Modified 310 steel

KW - High temperature corrosion

KW - Sigma-phase

U2 - 10.1080/09603409.2017.1389381

DO - 10.1080/09603409.2017.1389381

M3 - Journal article

VL - 35

SP - 243

EP - 254

JO - Materials at High Temperatures

JF - Materials at High Temperatures

SN - 0960-3409

IS - 1-3

ER -