Microstructural Developments and Tensile Properties of Lean Fe-Mn-Al-C Lightweight Steels
- Authors
- 손석수
- Issue Date
- 9월-2014
- Publisher
- SPRINGER
- Citation
- JOM, v.66, no.9, pp.1857 - 1867
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOM
- Volume
- 66
- Number
- 9
- Start Page
- 1857
- End Page
- 1867
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/139952
- DOI
- 10.1007/s11837-014-1128-3
- ISSN
- 1047-4838
- Abstract
- Concepts of Fe-Al-Mn-C-based lightweight steels are fairly simple, but primary metallurgical issues are complicated. In this study, recent studies on lean-composition lightweight steels were reviewed, summarized, and emphasized by their microstructural development and mechanical properties. The lightweight steels containing a low-density element of Al were designed by thermodynamic calculation and were manufactured by conventional industrial processes. Their microstructures consisted of various secondary phases as kappa-carbide, martensite, and austenite in the ferrite matrix according to manufacturing and annealing procedures. The solidification microstructure containing segregations of C, Mn, and Al produced a banded structure during the hot rolling. The (ferrite + austenite) duplex microstructure was formed after the annealing, and the austenite was retained at room temperature. It was because the thermal stability of austenite nucleated from fine kappa-carbide was quite high due to fine grain size of austenite. Because these lightweight steels have outstanding properties of strength and ductility as well as reduced density, they give a promise for automotive applications requiring excellent properties.
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