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  Cu addition effects on TRIP to TWIP transition and tensile property improvement of ultra-high-strength austenitic high-Mn steels

Choi, J. H., Jo, M. C., Lee, H., Zargaran, A., Song, T., Sohn, S. S., et al. (2019). Cu addition effects on TRIP to TWIP transition and tensile property improvement of ultra-high-strength austenitic high-Mn steels. Acta Materialia, 166, 246-260. doi:10.1016/j.actamat.2018.12.044.

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Choi, Jin Hyeok1, Autor           
Jo, Min Chul1, Autor           
Lee, Hyungsoo1, Autor           
Zargaran, Alireza2, Autor           
Song, Taejin3, Autor           
Sohn, Seok Su4, Autor           
Kim, Nack J.5, Autor           
Lee, Sunghak6, Autor           
Affiliations:
1Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790–784, South Korea, ou_persistent22              
2Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, 37673, South Korea, ou_persistent22              
3Gwangyang Steel Products Research Group, Technical Research Laboratories, POSCO, Kwangyang, 545-090, South Korea, ou_persistent22              
4High-Entropy Alloys, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_3010672              
5Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, 790–784, South Korea, ou_persistent22              
6Center for Advanced Aerospace MaterialsPohang, University of Science and Technology, Pohang, South Korea, ou_persistent22              

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Schlagwörter: Austenite; Austenitic stainless steel; Austenitic transformations; Cold rolling; Elongation; Mechanical properties; Metal cladding; Plasticity; Steel sheet; Tensile strength, (Mn,Cu)-segregated band; High Mn steels; Serrated flow; Transformation induced plasticity; TRIP to TWIP transition; Twinning-induced plasticities, High strength steel
 Zusammenfassung: Austenitic high-Mn steels have been nominated as desirable ultra-high-strength cold-rolled steels whose mechanical properties are greatly improved by powerful deformation mechanisms of transformation- and twinning-induced plasticity (TRIP and TWIP). In this study, an austenitic high-Mn TRIP steel was suggested to achieve a good strength-ductility balance, and 1–2 wt. Cu was added as an element for increasing stacking fault energy (SFE) as well as an austenite stabilizer to exploit a transition from TRIP to TWIP. The non-Cu-added steel showed the highest yield and tensile strengths (502 MPa and 1137 MPa, respectively) and the lowest elongation (34.6) with a serrated flow. Yield and tensile strengths decreased with increasing Cu content, while the elongation was the highest in the 1-Cu-added steel. TRIP and TWIP mechanisms showed good agreements with calculated SFEs in consideration of (Mn,Cu)-segregated bands. In the non-Cu-added steel, the TRIP occurred step by step as localized deformation bands passed through the specimen gage section to activate the serrated flow, which were reduced (or improved) by the transition from TRIP to TWIP with increasing Cu content. In the 1-Cu-added steel, overall tensile properties were improved (yield strength; 461 MPa, tensile strength; 1093 MPa, elongation; 65.1) as both TRIP and TWIP were well homogenized to produce synergic effects. © 2018 Acta Materialia Inc.

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Sprache(n): eng - English
 Datum: 2019-03
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1016/j.actamat.2018.12.044
 Art des Abschluß: -

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Titel: Acta Materialia
  Kurztitel : Acta Mater.
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: Kidlington : Elsevier Science
Seiten: - Band / Heft: 166 Artikelnummer: - Start- / Endseite: 246 - 260 Identifikator: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100