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Microstructural evolution and tensile properties of Fe–11Mn–10Al-1.2C medium-Mn lightweight steel.
- Source :
-
Materials Science & Engineering: A . Oct2020, Vol. 797, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
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Abstract
- In the present study, the variations of microstructure and tensile properties were investigated as a function of aging time using a Fe–11Mn–10Al-1.2C medium-Mn lightweight steel. The 1000 °C-annealed specimen revealed an austenite matrix containing nano-sized particles of intra-granular (IG) κ-carbide and a small amount of α-ferrite. After aging at 550 °C for 3 min, pre-existing IG κ-carbide grew up rapidly and relatively coarse κ-carbide formed at the γ-austenite grain boundary (GB). With aging for 10 min, the C-depleted zones, close to the coarsened GB κ-carbide particles, were transformed to filmy grain boundary ferrite (GBF). When aging time increased to 30 min, the eutectoid reaction (γ → α + κ) occurred preferentially at the coarse particles of GB κ-carbide. The eutectoid reaction continued with increasing aging time up to 720 min, and finally the specimen had a eutectoid matrix (α+κ) with a few of α-ferrite. The annealed specimen possessed high strengths (yield strength (YS) of 1242 MPa and ultimate tensile strength (UTS) of 1314 GPa) with moderate elongation (El) of 22.2%. The YS value of aged specimens was improved to ~1.35 GPa by the growth of IG κ-carbide particles after aging for 3 min, and increased further up to ~1.54 GPa by the formation of eutectoid structure after aging for 720 min. [ABSTRACT FROM AUTHOR]
- Subjects :
- *LIGHTWEIGHT steel
*TENSILE strength
*CRYSTAL grain boundaries
Subjects
Details
- Language :
- English
- ISSN :
- 09215093
- Volume :
- 797
- Database :
- Academic Search Index
- Journal :
- Materials Science & Engineering: A
- Publication Type :
- Academic Journal
- Accession number :
- 146412725
- Full Text :
- https://doi.org/10.1016/j.msea.2020.140256