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Ultrasonic nanocrystal surface modification for strength improvement and suppression of hydrogen permeation in multi-layered steel

Authors
Jo, Min CheolYoo, JisungAmanov, AuezhanSong, TaejinKim, Sang-HeonSohn, Seok SuLee, Sunghak
Issue Date
10-12월-2021
Publisher
ELSEVIER SCIENCE SA
Keywords
(UNSM); Hydrogen permeation; Microstructural evolution; Multi-layered steel (MLS); Tensile properties; Ultrasonic nanocrystal surface modification
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.885
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF ALLOYS AND COMPOUNDS
Volume
885
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/135438
DOI
10.1016/j.jallcom.2021.160975
ISSN
0925-8388
Abstract
Hydrogen embrittlement of multi-layered steel (MLS) is significantly affected by a degree of hydrogen permeation from surface layers to interfaces. Here, the surface microstructure of multi-layered steel was modified for the first time using ultrasonic nanocrystal surface modification (UNSM), and the roles of UNSM-treated surface layers in strength and hydrogen permeation behavior were investigated by examining microstructural evolutions of the surface layer. Since the UNSM induced the compressive residual stress, grain refinement, and deformation twin formation at the specimen surface, the yield strength greatly improved via synergetic contributions of the grain refinement effect and dislocation strengthening. In addition, the UNSM-affected zone of 150-210 mu m along depth direction effectively suppressed the hydrogen permeation by supplying compressive residual stresses and hydrogen trapping sites including grain boundaries, dislocations, and twin boundaries. (c) 2021 Elsevier B.V. All rights reserved.
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