Electrochemical characteristics of delta ferrite in thermally aged austenitic stainless steel weld

Gokul Obulan Subramanian; Sunghoon Hong; Ho Jung Lee; Byeong Seo Kong; Kyoung Soo Lee; Thak Sang Byun; Changheui Jang

doi:10.1007/978-3-030-04639-2_126

Electrochemical characteristics of delta ferrite in thermally aged austenitic stainless steel weld

Gokul Obulan Subramanian, Sunghoon Hong, Ho Jung Lee, Byeong Seo Kong, Kyoung Soo Lee, Thak Sang Byun, Changheui Jang^*

^*Corresponding author for this work

Metallurgy and Materials

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

Abstract

An austenitic stainless steel Type 316L weld was thermally aged for 20,000 h at 400 °C and electrochemical characterization was performed to measure corrosion resistance in δ–ferrite phase. It is well known that a severe thermal aging causes decrease of fracture resistance and increase of the hardness of δ–ferrite, which was related to the spinodal decomposition. After thermal aging, the DL-EPR response of 316L weld was dominated by parent austenite matrix without reactivation peak. To characterize the δ–ferrite only, austenite phase was selectively dissolved from the matrix by electrochemical etching method. The double–loop electrochemical potentiokinetic reactivation (DL-EPR) analysis of the δ–ferrite phase showed degradation in corrosion resistance after thermal aging with the appearance of a cathodic loop and reactivation peak during the reverse scan. The degradation in corrosion resistance of δ–ferrite phase could be attributed to the localized Cr-depletion due to spinodal decomposition and precipitation of intermetallic phases during thermal aging.

Original language	English
Title of host publication	Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors
Editors	John H. Jackson, Denise Paraventi, Michael Wright
Publisher	Springer
Pages	1869-1877
Number of pages	9
Edition	1
ISBN (Electronic)	9783030046392
ISBN (Print)	9783030046385
DOIs	https://doi.org/10.1007/978-3-030-04639-2_126
Publication status	Published - 2 Apr 2019
Event	18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors - Portland, United States Duration: 13 Aug 2017 → 17 Aug 2017

Publication series

Name	Minerals, Metals and Materials Series
ISSN (Print)	2367-1181
ISSN (Electronic)	2367-1696

Conference

Conference	18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors
Country/Territory	United States
City	Portland
Period	13/08/17 → 17/08/17

Bibliographical note

Publisher Copyright:
© 2019, The Minerals, Metals & Materials Society.

Keywords

Corrosion
Delta ferrite
DL-EPR analysis
Stainless steel weld
Thermal aging

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy Engineering and Power Technology
Mechanics of Materials
Metals and Alloys
Materials Chemistry

Access to Document

10.1007/978-3-030-04639-2_126

Cite this

Subramanian, G. O., Hong, S., Lee, H. J., Kong, B. S., Lee, K. S., Byun, T. S., & Jang, C. (2019). Electrochemical characteristics of delta ferrite in thermally aged austenitic stainless steel weld. In J. H. Jackson, D. Paraventi, & M. Wright (Eds.), Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors (1 ed., pp. 1869-1877). (Minerals, Metals and Materials Series). Springer. https://doi.org/10.1007/978-3-030-04639-2_126

Subramanian, Gokul Obulan ; Hong, Sunghoon ; Lee, Ho Jung et al. / Electrochemical characteristics of delta ferrite in thermally aged austenitic stainless steel weld. Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. editor / John H. Jackson ; Denise Paraventi ; Michael Wright. 1. ed. Springer, 2019. pp. 1869-1877 (Minerals, Metals and Materials Series).

@inproceedings{f90e1a31415a4739bf6fdde8c7a61782,

title = "Electrochemical characteristics of delta ferrite in thermally aged austenitic stainless steel weld",

abstract = "An austenitic stainless steel Type 316L weld was thermally aged for 20,000 h at 400 °C and electrochemical characterization was performed to measure corrosion resistance in δ–ferrite phase. It is well known that a severe thermal aging causes decrease of fracture resistance and increase of the hardness of δ–ferrite, which was related to the spinodal decomposition. After thermal aging, the DL-EPR response of 316L weld was dominated by parent austenite matrix without reactivation peak. To characterize the δ–ferrite only, austenite phase was selectively dissolved from the matrix by electrochemical etching method. The double–loop electrochemical potentiokinetic reactivation (DL-EPR) analysis of the δ–ferrite phase showed degradation in corrosion resistance after thermal aging with the appearance of a cathodic loop and reactivation peak during the reverse scan. The degradation in corrosion resistance of δ–ferrite phase could be attributed to the localized Cr-depletion due to spinodal decomposition and precipitation of intermetallic phases during thermal aging.",

keywords = "Corrosion, Delta ferrite, DL-EPR analysis, Stainless steel weld, Thermal aging",

author = "Subramanian, {Gokul Obulan} and Sunghoon Hong and Lee, {Ho Jung} and Kong, {Byeong Seo} and Lee, {Kyoung Soo} and Byun, {Thak Sang} and Changheui Jang",

note = "Publisher Copyright: {\textcopyright} 2019, The Minerals, Metals & Materials Society.; 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors ; Conference date: 13-08-2017 Through 17-08-2017",

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language = "English",

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Subramanian, GO, Hong, S, Lee, HJ, Kong, BS, Lee, KS, Byun, TS & Jang, C 2019, Electrochemical characteristics of delta ferrite in thermally aged austenitic stainless steel weld. in JH Jackson, D Paraventi & M Wright (eds), Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. 1 edn, Minerals, Metals and Materials Series, Springer, pp. 1869-1877, 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, Portland, United States, 13/08/17. https://doi.org/10.1007/978-3-030-04639-2_126

Electrochemical characteristics of delta ferrite in thermally aged austenitic stainless steel weld. / Subramanian, Gokul Obulan; Hong, Sunghoon; Lee, Ho Jung et al.
Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. ed. / John H. Jackson; Denise Paraventi; Michael Wright. 1. ed. Springer, 2019. p. 1869-1877 (Minerals, Metals and Materials Series).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Electrochemical characteristics of delta ferrite in thermally aged austenitic stainless steel weld

AU - Subramanian, Gokul Obulan

AU - Hong, Sunghoon

AU - Lee, Ho Jung

AU - Kong, Byeong Seo

AU - Lee, Kyoung Soo

AU - Byun, Thak Sang

AU - Jang, Changheui

PY - 2019/4/2

Y1 - 2019/4/2

N2 - An austenitic stainless steel Type 316L weld was thermally aged for 20,000 h at 400 °C and electrochemical characterization was performed to measure corrosion resistance in δ–ferrite phase. It is well known that a severe thermal aging causes decrease of fracture resistance and increase of the hardness of δ–ferrite, which was related to the spinodal decomposition. After thermal aging, the DL-EPR response of 316L weld was dominated by parent austenite matrix without reactivation peak. To characterize the δ–ferrite only, austenite phase was selectively dissolved from the matrix by electrochemical etching method. The double–loop electrochemical potentiokinetic reactivation (DL-EPR) analysis of the δ–ferrite phase showed degradation in corrosion resistance after thermal aging with the appearance of a cathodic loop and reactivation peak during the reverse scan. The degradation in corrosion resistance of δ–ferrite phase could be attributed to the localized Cr-depletion due to spinodal decomposition and precipitation of intermetallic phases during thermal aging.

AB - An austenitic stainless steel Type 316L weld was thermally aged for 20,000 h at 400 °C and electrochemical characterization was performed to measure corrosion resistance in δ–ferrite phase. It is well known that a severe thermal aging causes decrease of fracture resistance and increase of the hardness of δ–ferrite, which was related to the spinodal decomposition. After thermal aging, the DL-EPR response of 316L weld was dominated by parent austenite matrix without reactivation peak. To characterize the δ–ferrite only, austenite phase was selectively dissolved from the matrix by electrochemical etching method. The double–loop electrochemical potentiokinetic reactivation (DL-EPR) analysis of the δ–ferrite phase showed degradation in corrosion resistance after thermal aging with the appearance of a cathodic loop and reactivation peak during the reverse scan. The degradation in corrosion resistance of δ–ferrite phase could be attributed to the localized Cr-depletion due to spinodal decomposition and precipitation of intermetallic phases during thermal aging.

KW - Corrosion

KW - Delta ferrite

KW - DL-EPR analysis

KW - Stainless steel weld

KW - Thermal aging

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U2 - 10.1007/978-3-030-04639-2_126

DO - 10.1007/978-3-030-04639-2_126

M3 - Conference contribution

AN - SCOPUS:85064064959

SN - 9783030046385

T3 - Minerals, Metals and Materials Series

SP - 1869

EP - 1877

BT - Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors

A2 - Jackson, John H.

A2 - Paraventi, Denise

A2 - Wright, Michael

PB - Springer

T2 - 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors

Y2 - 13 August 2017 through 17 August 2017

ER -

Subramanian GO, Hong S, Lee HJ, Kong BS, Lee KS, Byun TS et al. Electrochemical characteristics of delta ferrite in thermally aged austenitic stainless steel weld. In Jackson JH, Paraventi D, Wright M, editors, Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. 1 ed. Springer. 2019. p. 1869-1877. (Minerals, Metals and Materials Series). Epub 2018 Dec 20. doi: 10.1007/978-3-030-04639-2_126

Electrochemical characteristics of delta ferrite in thermally aged austenitic stainless steel weld

Abstract

Publication series

Conference

Bibliographical note

Keywords

ASJC Scopus subject areas

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