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

Research output: Contribution to journalArticlepeer-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 languageEnglish
Pages (from-to)236-241
Number of pages6
JournalScripta Materialia
Volume186
DOIs
Publication statusPublished - Sep 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

Fingerprint

Dive into the research topics of 'Evaluation of thermal ageing activation energy of δ-ferrite in an austenitic stainless steel weld using nanopillar compression test'. Together they form a unique fingerprint.

Cite this