DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kim, Min Tae | ko |
dc.contributor.author | Park, Tak Min | ko |
dc.contributor.author | Baik, Kyeong-Ho | ko |
dc.contributor.author | Choi, Woo Seok | ko |
dc.contributor.author | Choi, Pyuck-Pa | ko |
dc.contributor.author | Han, Jeongho | ko |
dc.date.accessioned | 2018-12-20T08:00:11Z | - |
dc.date.available | 2018-12-20T08:00:11Z | - |
dc.date.created | 2018-11-07 | - |
dc.date.created | 2018-11-07 | - |
dc.date.issued | 2019-02 | - |
dc.identifier.citation | ACTA MATERIALIA, v.164, pp.122 - 134 | - |
dc.identifier.issn | 1359-6454 | - |
dc.identifier.uri | http://hdl.handle.net/10203/248657 | - |
dc.description.abstract | We investigated the correlation between the impact toughness and microstructures of annealed Fe-8Mn-0.2C-3Al-1.3Si (wt.%) steel to identify the key microstructural feature determining the impact toughness of medium-Mn steel. The microstructural constituents were varied by changing the hot-rolling temperature in the range of 1000–1200 °C before intercritical annealing. The annealed steels exhibited a triplex-phase microstructure consisting of δ ferrite with coarse grains and an elongated structure along the rolling and transverse directions and nanolaminate α martensite plus γR retained austenite with ultrafine size. While the volume fraction of γR remained almost constant regardless of the hot-rolling temperature, the volume fraction of δ increased and that of α decreased with increase in the hot-rolling temperature. The average grain size for all phases increased with the hot-rolling temperature. The stability of γR decreased with the increase of the hot-rolling temperature owing to grain coarsening and a reduction in the Mn and C concentrations. A lower hot-rolling temperature resulted in improved impact toughness. We observed that deep parallel cracks formed and propagated along the δ interface decorated with Mn, ultimately causing a fracture. This result indicates that δ ferrite was the crucial factor determining the toughness among the existing phases, and the steels with a higher fraction of δ exhibited a lower impact toughness. The decrease of the retained austenite stability and the increase of the size of prior γ grains with increasing hot-rolling temperature were identified as other microstructural factors determining the impact toughness. | - |
dc.language | English | - |
dc.publisher | PERGAMON-ELSEVIER SCIENCE LTD | - |
dc.title | Crucial microstructural feature to determine the impact toughness of intercritically annealed medium-Mn steel with triplex-phase microstructure | - |
dc.type | Article | - |
dc.identifier.wosid | 000456902800011 | - |
dc.identifier.scopusid | 2-s2.0-85055658684 | - |
dc.type.rims | ART | - |
dc.citation.volume | 164 | - |
dc.citation.beginningpage | 122 | - |
dc.citation.endingpage | 134 | - |
dc.citation.publicationname | ACTA MATERIALIA | - |
dc.identifier.doi | 10.1016/j.actamat.2018.10.043 | - |
dc.contributor.localauthor | Choi, Pyuck-Pa | - |
dc.contributor.nonIdAuthor | Kim, Min Tae | - |
dc.contributor.nonIdAuthor | Park, Tak Min | - |
dc.contributor.nonIdAuthor | Baik, Kyeong-Ho | - |
dc.contributor.nonIdAuthor | Han, Jeongho | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
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