Evaluation of thermal aging of δ-ferrite in austenitic stainless steel weld using nanopillar compression test. (October 2018)

• Record Type: Journal Article
• Authors: Lee, Ho Jung; Kong, Byeong Seo; Obulan Subramanian, Gokul; Heo, Jaewon; Jang, Changheui; Lee, Kyoung-Soo
• Is Part Of: Scripta materialia. Number 155(2018)
• Page Start: 32
• Page End: 36
• Publication Date: 2018-10
• Subjects: Thermal aging -- δ-Ferrites -- Spinodal decomposition -- G phase -- Nanopillar compression test; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.06.016
• Languages: English
• ISSNs: 1359-6462

Abstract

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. Graphical abstract: Unlabelled Image