Evaluation of thermal aging of δ-ferrite in austenitic stainless steel weld using nanopillar compression test

Ho Jung Lee; Byeong Seo Kong; Gokul Obulan Subramanian; Jaewon Heo; Changheui Jang; Kyoung Soo Lee

doi:10.1016/j.scriptamat.2018.06.016

Evaluation of thermal aging of δ-ferrite in austenitic stainless steel weld using nanopillar compression test

Ho Jung Lee, Byeong Seo Kong, Gokul Obulan Subramanian, Jaewon Heo, Changheui Jang^*, Kyoung Soo Lee

^*Corresponding author for this work

Metallurgy and Materials

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

11 Citations (Scopus)

Abstract

The effects of thermal aging on microstructure and mechanical property change of δ-ferrite in an austenitic stainless steel weld were investigated. After thermal aging at 400 °C for 20,000 h, spinodal decomposition and G phase precipitation were observed, along with ~80% increase in yield strength measured by nanopillar compression test. Subsequent reversion heat treatment removed spinodal decomposition while leaving G phase, resulting in partial recovery of hardening in δ-ferrite. It was estimated that ~60% of the hardening in the δ-ferrite of the aged specimen was attributed to spinodal decomposition and ~40% to G phase, respectively.

Original language	English
Pages (from-to)	32-36
Number of pages	5
Journal	Scripta Materialia
Volume	155
DOIs	https://doi.org/10.1016/j.scriptamat.2018.06.016
Publication status	Published - Oct 2018

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/NRF of Rep. of Korea.

Publisher Copyright:
© 2018 Elsevier Ltd

Keywords

G phase
Nanopillar compression test
Spinodal decomposition
Thermal aging
δ-Ferrites

ASJC Scopus subject areas

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

Access to Document

10.1016/j.scriptamat.2018.06.016

Cite this

@article{735a0dc3b42a4a0aa14bea9f89b0ad25,

title = "Evaluation of thermal aging of δ-ferrite in austenitic stainless steel weld using nanopillar compression test",

abstract = "The effects of thermal aging on microstructure and mechanical property change of δ-ferrite in an austenitic stainless steel weld were investigated. After thermal aging at 400 °C for 20,000 h, spinodal decomposition and G phase precipitation were observed, along with ~80% increase in yield strength measured by nanopillar compression test. Subsequent reversion heat treatment removed spinodal decomposition while leaving G phase, resulting in partial recovery of hardening in δ-ferrite. It was estimated that ~60% of the hardening in the δ-ferrite of the aged specimen was attributed to spinodal decomposition and ~40% to G phase, respectively.",

keywords = "G phase, Nanopillar compression test, Spinodal decomposition, Thermal aging, δ-Ferrites",

author = "Lee, {Ho Jung} and Kong, {Byeong Seo} and {Obulan Subramanian}, Gokul and Jaewon Heo and Changheui Jang and Lee, {Kyoung Soo}",

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/NRF of Rep. of Korea. Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

year = "2018",

month = oct,

doi = "10.1016/j.scriptamat.2018.06.016",

language = "English",

volume = "155",

pages = "32--36",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Elsevier",

}

TY - JOUR

T1 - Evaluation of thermal aging of δ-ferrite in austenitic stainless steel weld using nanopillar compression test

AU - Lee, Ho Jung

AU - Kong, Byeong Seo

AU - Obulan Subramanian, Gokul

AU - Heo, Jaewon

AU - Jang, Changheui

AU - Lee, Kyoung Soo

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/NRF of Rep. of Korea. Publisher Copyright: © 2018 Elsevier Ltd

PY - 2018/10

Y1 - 2018/10

N2 - The effects of thermal aging on microstructure and mechanical property change of δ-ferrite in an austenitic stainless steel weld were investigated. After thermal aging at 400 °C for 20,000 h, spinodal decomposition and G phase precipitation were observed, along with ~80% increase in yield strength measured by nanopillar compression test. Subsequent reversion heat treatment removed spinodal decomposition while leaving G phase, resulting in partial recovery of hardening in δ-ferrite. It was estimated that ~60% of the hardening in the δ-ferrite of the aged specimen was attributed to spinodal decomposition and ~40% to G phase, respectively.

AB - The effects of thermal aging on microstructure and mechanical property change of δ-ferrite in an austenitic stainless steel weld were investigated. After thermal aging at 400 °C for 20,000 h, spinodal decomposition and G phase precipitation were observed, along with ~80% increase in yield strength measured by nanopillar compression test. Subsequent reversion heat treatment removed spinodal decomposition while leaving G phase, resulting in partial recovery of hardening in δ-ferrite. It was estimated that ~60% of the hardening in the δ-ferrite of the aged specimen was attributed to spinodal decomposition and ~40% to G phase, respectively.

KW - G phase

KW - Nanopillar compression test

KW - Spinodal decomposition

KW - Thermal aging

KW - δ-Ferrites

UR - http://www.scopus.com/inward/record.url?scp=85049508303&partnerID=8YFLogxK

U2 - 10.1016/j.scriptamat.2018.06.016

DO - 10.1016/j.scriptamat.2018.06.016

M3 - Article

AN - SCOPUS:85049508303

SN - 1359-6462

VL - 155

SP - 32

EP - 36

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Evaluation of thermal aging of δ-ferrite in austenitic stainless steel weld using nanopillar compression test

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

Fingerprint

Cite this