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  Ti-bearing lightweight steel with large high temperature ductility via thermally stable multi-phase microstructure

Moon, J., Jo, H.-H., Park, S.-J., Kim, S.-D., Lee, T.-H., Lee, C.-H., et al. (2021). Ti-bearing lightweight steel with large high temperature ductility via thermally stable multi-phase microstructure. Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 808: 140954. doi:10.1016/j.msea.2021.140954.

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 Creators:
Moon, Joonoh1, Author              
Jo, Hyo-Haeng1, Author              
Park, Seong-Jun1, Author              
Kim, Sung-Dae1, Author              
Lee, Tae-Ho1, Author              
Lee, Chang-Hoon1, Author              
Lee, Myoung-Gyu2, Author              
Hong, Hyun-Uk3, Author              
Suh, Dong-Woo4, Author              
Raabe, Dierk5, Author              
Affiliations:
1Steel Department, Advanced Metals Division, Korea Institute of Materials Science, 797 Changwondae-ro, Seongsan-gu, Changwon, Gyeongnam, 51508, Republic of Korea, ou_persistent22              
2Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea, ou_persistent22              
3Department of Materials Science and Engineering, Changwon National University, 20 Changwondaehak-ro, Uichang-gu, Changwon, Gyeongnam, 51140, Republic of Korea, ou_persistent22              
4Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, 77 Cheongam-ro, Nam-gu, Gyeongbuk, 37673, Republic of Korea, ou_persistent22              
5Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              

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Free keywords: Carbides; Climate change; Ductility; Microstructure; Tensile strength; Thermodynamic stability; Titanium alloys, Elevated temperature; High thermal stability; High-temperature ductility; Light-weight steels; Multi-phase structures; Multiphase microstructure; Sustainable solution; Ultimate tensile strength, Aluminum coated steel
 Abstract: The global demand for lightweight design is increasing to provide sustainable solutions to counteract climate change. We developed a novel Ti-bearing lightweight steel (8 lower mass density than general steels), which exhibits an excellent combination of strength (491 MPa ultimate tensile strength) and tensile ductility (31) at elevated temperature (600 °C). The developed steel is suitable for parts subjected to high temperature at reduced dynamical load. The composition of the developed steel (Fe–20Mn–6Ti–3Al–0.06C–NbNi (wt)) lends the alloy a multiphase structure with austenite matrix, partially ordered ferrite, Fe2Ti Laves phase, and fine MC carbides. At elevated temperature (600 °C), the ductility of the new material is at least 2.5 times higher than that of conventional lightweight steels based on the Fe–Mn–Al system, which become brittle at elevated temperatures due to the inter/intragranular precipitation of κ-carbides. This is achieved by the high thermal stability of its microstructure and the avoidance of brittle κ-carbides in this temperature range. © 2021 Elsevier B.V.

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Language(s): eng - English
 Dates: 2021-03-18
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.msea.2021.140954
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Title: Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing
  Abbreviation : Mater. Sci. Eng. A: Struct. Mater. Prop. Microstruct. Process.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B.V.
Pages: - Volume / Issue: 808 Sequence Number: 140954 Start / End Page: - Identifier: ISSN: 0921-5093
CoNE: https://pure.mpg.de/cone/journals/resource/954928498465_1