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	Minerals, Metals and Materials Series
Publisher	Springer
Pages	1869-1877
Number of pages	9
ISBN (Print)	9783030046385, 9783030046392, 9783319515403, 9783319651354, 9783319728520, 9783319950211
DOIs	https://doi.org/10.1007/978-3-030-04639-2_126
Publication status	Published - 2019
Event	18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors 2019 - Boston, United States Duration: 18 Aug 2019 → 22 Aug 2019

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 2019
Country/Territory	United States
City	Boston
Period	18/08/19 → 22/08/19

Bibliographical note

Funding Information:
This study is mainly supported by the Korea Hydro and Nuclear Power Co., Ltd. as the Proactive Material Aging Management Project. Part of the funding is provided as Nuclear R&D Program (2015M2A8A2074798) of the MSIP/NRF of Rep. of Korea. Financial support for three of the authors is provided by the BK-Plus Program of the MSIP of Rep. of Korea.

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

@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 = "Funding Information: This study is mainly supported by the Korea Hydro and Nuclear Power Co., Ltd. as the Proactive Material Aging Management Project. Part of the funding is provided as Nuclear R&D Program (2015M2A8A2074798) of the MSIP/NRF of Rep. of Korea. Financial support for three of the authors is provided by the BK-Plus Program of the MSIP of Rep. of Korea. Publisher Copyright: {\textcopyright} 2019, The Minerals, Metals & Materials Society.; 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors 2019 ; Conference date: 18-08-2019 Through 22-08-2019",

year = "2019",

doi = "10.1007/978-3-030-04639-2_126",

language = "English",

isbn = "9783030046385",

series = "Minerals, Metals and Materials Series",

publisher = "Springer",

pages = "1869--1877",

booktitle = "Minerals, Metals and Materials Series",

}

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 Minerals, Metals and Materials Series. Minerals, Metals and Materials Series, Springer, pp. 1869-1877, 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors 2019, Boston, United States, 18/08/19. https://doi.org/10.1007/978-3-030-04639-2_126

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

N1 - Funding Information: This study is mainly supported by the Korea Hydro and Nuclear Power Co., Ltd. as the Proactive Material Aging Management Project. Part of the funding is provided as Nuclear R&D Program (2015M2A8A2074798) of the MSIP/NRF of Rep. of Korea. Financial support for three of the authors is provided by the BK-Plus Program of the MSIP of Rep. of Korea. Publisher Copyright: © 2019, The Minerals, Metals & Materials Society.

PY - 2019

Y1 - 2019

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

UR - http://www.scopus.com/inward/record.url?scp=85064064959&partnerID=8YFLogxK

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

SN - 9783030046392

SN - 9783319515403

SN - 9783319651354

SN - 9783319728520

SN - 9783319950211

T3 - Minerals, Metals and Materials Series

SP - 1869

EP - 1877

BT - Minerals, Metals and Materials Series

PB - Springer

T2 - 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors 2019

Y2 - 18 August 2019 through 22 August 2019

ER -

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

Abstract

Publication series

Conference

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

Fingerprint

Cite this