Novel medium-Mn (austenite plus martensite) duplex hot-rolled steel achieving 1.6 GPa strength with 20 % ductility by Mn-segregation-induced TRIP mechanism
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 손석수 | - |
dc.date.accessioned | 2022-04-09T10:40:49Z | - |
dc.date.available | 2022-04-09T10:40:49Z | - |
dc.date.created | 2022-04-08 | - |
dc.date.issued | 2018-04 | - |
dc.identifier.issn | 1359-6454 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/139769 | - |
dc.description.abstract | Ultra-high-strength (over 1 GPa) hot-rolled steel sheets have been actively developed to protect passengers in cases of vehicle crashes, and their applications have been expanded to cold-rolled steel sheets. A major alloying element for forming meta-stable austenite is Mn in (austenite + martensite) duplex microstructures, which is readily obtained at medium-Mn level ((3-10) wt.%). However, these medium-Mn hot-rolled duplex microstructures inevitably include Mn-segregated bands, which often lead to anisotropic mechanical properties and deteriorate the strength or uniform elongation. However, in this study, we show favorable effects of the Mn-segregated band, by carefully controlling the composition, size, and shape of austenite in Mn-rich and Mn-lean bands in medium-Mn duplex steels (composition; Fe-0.1C-10Mn-1Si-0.3Mo-0.5 V (wt.%)). The austenite grown coarsely in the Mn-rich band provoked transformation-induced plasticity (TRIP) more efficiently than the austenite finely transformed from the martensite in the Mn-lean band. The Mn composition acted more dominantly on the austenite stability than the austenite size, resulting in continuous TRIP in the austenite of the Mn-rich band. This austenite enables continuous strain hardening, thereby leading to high yield and tensile stren | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | PERGAMON-ELSEVIER SCIENCE LTD | - |
dc.title | Novel medium-Mn (austenite plus martensite) duplex hot-rolled steel achieving 1.6 GPa strength with 20 % ductility by Mn-segregation-induced TRIP mechanism | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | 손석수 | - |
dc.identifier.doi | 10.1016/j.actamat.2018.01.033 | - |
dc.identifier.bibliographicCitation | ACTA MATERIALIA, v.147, pp.247 - 260 | - |
dc.relation.isPartOf | ACTA MATERIALIA | - |
dc.citation.title | ACTA MATERIALIA | - |
dc.citation.volume | 147 | - |
dc.citation.startPage | 247 | - |
dc.citation.endPage | 260 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordAuthor | Austenite stability | - |
dc.subject.keywordAuthor | Duplex steel | - |
dc.subject.keywordAuthor | Hot-rolled steel | - |
dc.subject.keywordAuthor | Mn segregation | - |
dc.subject.keywordAuthor | TRansformation Induced Plasticity (TRIP) | - |
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