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- W4200320746 abstract "This paper aimed to study the effects of annealing temperature on the microstructures and yield strength (YS) in the Fe-11Mn-xAl-yC medium-Mn lightweight steels, and reveal the structure-strength relationships and strengthening mechanisms. As the annealing temperature decreased from 1100 °C to 850 °C, the YS of the IG κ-carbide-free Fe-11Mn-7Al-0.6C steel (0.6C) could be improved from 482 MPa to 630 MPa by grain size refinement strengthening. When the 0.6C steel was annealed below 800 °C, partial recrystallization occurred and brought about a great increase in the YS up to 1.1 GPa by the high dislocation density (8.2–10.9 × 1014 m−2). The increases in the contents of C and Al promoted the precipitation of both grain boundary (GB) and intra-granular (IG) κ-carbides. Thus, the 1000 °C-annealed Fe-11Mn-10Al-1.2C steel possessed an austenite matrix containing nano κ-carbide and a small amount of α-ferrite, and achieved ultrahigh YS of 1242 MPa by relying on the remarkable precipitation strengthening effect (679 MPa). This study provided a new insight into comprehensively understanding the relationships among alloy composition, thermomechanical process (TMP), microstructures and various strengthening mechanisms in the lightweight steels so as to improve the YS." @default.
- W4200320746 created "2021-12-31" @default.
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- W4200320746 date "2022-01-01" @default.
- W4200320746 modified "2023-10-16" @default.
- W4200320746 title "Improvement of the yield strength of Fe-11Mn-xAl-yC medium-Mn lightweight steels by tuning partial recrystallization and intra-granular κ-carbide strengthening" @default.
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- W4200320746 doi "https://doi.org/10.1016/j.msea.2021.142553" @default.
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