Evaluation of thermal ageing activation energy of δ-ferrite in an austenitic stainless steel weld using nanopillar compression test

Byeong Seo Kong; Jiho Shin; Gokul Obulan Subramanian; Junjie Chen; Changheui Jang; Ye eun Na; Dongchan Jang; Ho Jung Lee; Jun Seog Yang

doi:10.1016/j.scriptamat.2020.05.046

Evaluation of thermal ageing activation energy of δ-ferrite in an austenitic stainless steel weld using nanopillar compression test

Byeong Seo Kong^*, Jiho Shin, Gokul Obulan Subramanian, Junjie Chen, Changheui Jang, Ye eun Na, Dongchan Jang, Ho Jung Lee, Jun Seog Yang

^*Corresponding author for this work

Metallurgy and Materials

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Nanopillar compression tests were applied on δ-ferrites in austenitic stainless steel welds to measure the thermal ageing activation energy caused by spinodal decomposition. Welds of an austenitic stainless steel were thermally aged at 343, 375, and 400 ^oC for up to 20,000 h. To avoid the interference of surrounding austenite matrix on embrittlement measurement, austenite matrix was selectively dissolved before the nanopillar fabrication. Using the yield stress changes measured by nanopillar compression tests, the thermal ageing activation energy of δ-ferrite was estimated as 154 KJ/mol, which was compared with literature results and the reasons of discrepancy were discussed.

Original language	English
Pages (from-to)	236-241
Number of pages	6
Journal	Scripta Materialia
Volume	186
DOIs	https://doi.org/10.1016/j.scriptamat.2020.05.046
Publication status	Published - Sept 2020

Bibliographical note

Funding Information:
This work was mostly supported by the Central Research Institute of Korea Hydro & Nuclear Power Co. Ltd. (L18S054000) of the Rep. of Korea. Part of funding was provided by KU?KAIST International Joint Research Project (N11190057) of Korea Advanced Institute of Science and Technology (KAIST) and Korea Institute of Energy Technology Evaluation and Planning (20171510101990) of the Rep. of Korea.

Funding Information:
This work was mostly supported by the Central Research Institute of Korea Hydro & Nuclear Power Co. Ltd., (L18S054000) of the Rep. of Korea. Part of funding was provided by KU‐KAIST International Joint Research Project (N11190057) of Korea Advanced Institute of Science and Technology (KAIST) and Korea Institute of Energy Technology Evaluation and Planning (20171510101990) of the Rep. of Korea.

Publisher Copyright:
© 2020 Acta Materialia Inc.

Keywords

activation energy
nanopillar compression test
spinodal decomposition
thermal ageing
δ-ferrites

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2020.05.046

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title = "Evaluation of thermal ageing activation energy of δ-ferrite in an austenitic stainless steel weld using nanopillar compression test",

abstract = "Nanopillar compression tests were applied on δ-ferrites in austenitic stainless steel welds to measure the thermal ageing activation energy caused by spinodal decomposition. Welds of an austenitic stainless steel were thermally aged at 343, 375, and 400 oC for up to 20,000 h. To avoid the interference of surrounding austenite matrix on embrittlement measurement, austenite matrix was selectively dissolved before the nanopillar fabrication. Using the yield stress changes measured by nanopillar compression tests, the thermal ageing activation energy of δ-ferrite was estimated as 154 KJ/mol, which was compared with literature results and the reasons of discrepancy were discussed.",

keywords = "activation energy, nanopillar compression test, spinodal decomposition, thermal ageing, δ-ferrites",

author = "Kong, {Byeong Seo} and Jiho Shin and {Obulan Subramanian}, Gokul and Junjie Chen and Changheui Jang and Na, {Ye eun} and Dongchan Jang and Lee, {Ho Jung} and Yang, {Jun Seog}",

note = "Funding Information: This work was mostly supported by the Central Research Institute of Korea Hydro & Nuclear Power Co. Ltd. (L18S054000) of the Rep. of Korea. Part of funding was provided by KU?KAIST International Joint Research Project (N11190057) of Korea Advanced Institute of Science and Technology (KAIST) and Korea Institute of Energy Technology Evaluation and Planning (20171510101990) of the Rep. of Korea. Funding Information: This work was mostly supported by the Central Research Institute of Korea Hydro & Nuclear Power Co. Ltd., (L18S054000) of the Rep. of Korea. Part of funding was provided by KU‐KAIST International Joint Research Project (N11190057) of Korea Advanced Institute of Science and Technology (KAIST) and Korea Institute of Energy Technology Evaluation and Planning (20171510101990) of the Rep. of Korea. Publisher Copyright: {\textcopyright} 2020 Acta Materialia Inc.",

year = "2020",

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doi = "10.1016/j.scriptamat.2020.05.046",

language = "English",

volume = "186",

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journal = "Scripta Materialia",

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AU - Kong, Byeong Seo

AU - Shin, Jiho

AU - Obulan Subramanian, Gokul

AU - Chen, Junjie

AU - Jang, Changheui

AU - Na, Ye eun

AU - Jang, Dongchan

AU - Lee, Ho Jung

AU - Yang, Jun Seog

N1 - Funding Information: This work was mostly supported by the Central Research Institute of Korea Hydro & Nuclear Power Co. Ltd. (L18S054000) of the Rep. of Korea. Part of funding was provided by KU?KAIST International Joint Research Project (N11190057) of Korea Advanced Institute of Science and Technology (KAIST) and Korea Institute of Energy Technology Evaluation and Planning (20171510101990) of the Rep. of Korea. Funding Information: This work was mostly supported by the Central Research Institute of Korea Hydro & Nuclear Power Co. Ltd., (L18S054000) of the Rep. of Korea. Part of funding was provided by KU‐KAIST International Joint Research Project (N11190057) of Korea Advanced Institute of Science and Technology (KAIST) and Korea Institute of Energy Technology Evaluation and Planning (20171510101990) of the Rep. of Korea. Publisher Copyright: © 2020 Acta Materialia Inc.

PY - 2020/9

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N2 - Nanopillar compression tests were applied on δ-ferrites in austenitic stainless steel welds to measure the thermal ageing activation energy caused by spinodal decomposition. Welds of an austenitic stainless steel were thermally aged at 343, 375, and 400 oC for up to 20,000 h. To avoid the interference of surrounding austenite matrix on embrittlement measurement, austenite matrix was selectively dissolved before the nanopillar fabrication. Using the yield stress changes measured by nanopillar compression tests, the thermal ageing activation energy of δ-ferrite was estimated as 154 KJ/mol, which was compared with literature results and the reasons of discrepancy were discussed.

AB - Nanopillar compression tests were applied on δ-ferrites in austenitic stainless steel welds to measure the thermal ageing activation energy caused by spinodal decomposition. Welds of an austenitic stainless steel were thermally aged at 343, 375, and 400 oC for up to 20,000 h. To avoid the interference of surrounding austenite matrix on embrittlement measurement, austenite matrix was selectively dissolved before the nanopillar fabrication. Using the yield stress changes measured by nanopillar compression tests, the thermal ageing activation energy of δ-ferrite was estimated as 154 KJ/mol, which was compared with literature results and the reasons of discrepancy were discussed.

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ER -

Evaluation of thermal ageing activation energy of δ-ferrite in an austenitic stainless steel weld using nanopillar compression test

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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