Effects of Al-Si coating structures on bendability and resistance to hydrogen embrittlement in 1.5-GPa-grade hot-press-forming steel
DC Field | Value | Language |
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dc.contributor.author | Yoo, Jisung | - |
dc.contributor.author | Kim, Selim | - |
dc.contributor.author | Kim, Seongwoo | - |
dc.contributor.author | Oh, Jinkeun | - |
dc.contributor.author | Kim, Sang-Heon | - |
dc.contributor.author | Lee, Sunghak | - |
dc.contributor.author | Sohn, Seok Su | - |
dc.contributor.author | Jo, Min Cheol | - |
dc.date.accessioned | 2022-06-11T05:40:18Z | - |
dc.date.available | 2022-06-11T05:40:18Z | - |
dc.date.created | 2022-06-09 | - |
dc.date.issued | 2022-02-15 | - |
dc.identifier.issn | 1359-6454 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/141946 | - |
dc.description.abstract | Hot-press-forming (HPF) steels have attracted great attention as automotive reinforcement parts, but are exposed to the potential risk of hydrogen embrittlement (HE) because H introduced easily during HPF processes is hardly de-trapped through the solidified coating. In particular, H seriously deteriorates bendability, which is one of the main properties to be considered. In this study, the Al-Si coating structures were modified to improve H emission by increasing H diffusivity. The effects of coating structures on bendability and H desorption were investigated by interrupted bending tests, H-permeation tests, and thermal desorption analyses according to elapsed time after H-charging. Immersion in an Al-10%Si bath and the subsequent HPF process (930 degrees C for 6 min) produced a 33 mu m-thick multiple coating structure composed of Fe2Al5, FeAl, and ferrite layers. On the other hand, the reduced Al-Si adhesion amount from the dip bath and the increased time and temperature (950 degrees C for 30 min) produced a 30 mu m-thick body-centered-cubic (BCC)-based coating structure composed of FeAl and ferrite layers. The BCC-based crystal structure, reduced Al content in the FeAl layer, and coarsened ferrite grains effectively enhanced H diffusivity and suppressed H-induced degradation. Moreover, the softened FeAl and thick ferrite layers improved bendability by allowing the large strain accommodation of bending deformation. Thus, this work proposes an optimal Al-Si coating design that enhances both bendability and resistance to H-induced degradation for secure HPF steel applications. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | PERGAMON-ELSEVIER SCIENCE LTD | - |
dc.subject | HIGH-STRENGTH STEEL | - |
dc.subject | FRACTURE-TOUGHNESS | - |
dc.subject | DELAYED-FRACTURE | - |
dc.subject | IRON ALUMINIDES | - |
dc.subject | BORON | - |
dc.subject | DIFFUSION | - |
dc.subject | SUSCEPTIBILITY | - |
dc.subject | BEHAVIOR | - |
dc.subject | PHASE | - |
dc.subject | MICROSTRUCTURE | - |
dc.title | Effects of Al-Si coating structures on bendability and resistance to hydrogen embrittlement in 1.5-GPa-grade hot-press-forming steel | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Sohn, Seok Su | - |
dc.identifier.doi | 10.1016/j.actamat.2021.117561 | - |
dc.identifier.scopusid | 2-s2.0-85121632204 | - |
dc.identifier.wosid | 000788849300005 | - |
dc.identifier.bibliographicCitation | ACTA MATERIALIA, v.225 | - |
dc.relation.isPartOf | ACTA MATERIALIA | - |
dc.citation.title | ACTA MATERIALIA | - |
dc.citation.volume | 225 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Materials Science | - |
dc.relation.journalResearchArea | Metallurgy & Metallurgical Engineering | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Multidisciplinary | - |
dc.relation.journalWebOfScienceCategory | Metallurgy & Metallurgical Engineering | - |
dc.subject.keywordPlus | HIGH-STRENGTH STEEL | - |
dc.subject.keywordPlus | FRACTURE-TOUGHNESS | - |
dc.subject.keywordPlus | DELAYED-FRACTURE | - |
dc.subject.keywordPlus | IRON ALUMINIDES | - |
dc.subject.keywordPlus | BORON | - |
dc.subject.keywordPlus | DIFFUSION | - |
dc.subject.keywordPlus | SUSCEPTIBILITY | - |
dc.subject.keywordPlus | BEHAVIOR | - |
dc.subject.keywordPlus | PHASE | - |
dc.subject.keywordPlus | MICROSTRUCTURE | - |
dc.subject.keywordAuthor | Hot-press-forming steel | - |
dc.subject.keywordAuthor | Al-Si coating structure | - |
dc.subject.keywordAuthor | Hydrogen embrittlement | - |
dc.subject.keywordAuthor | Interrupted three-point bending test | - |
dc.subject.keywordAuthor | Hydrogen diffusivity | - |
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