Tensile Properties and Microstructure Evolutions of Low-Density Duplex Fe–12Mn–7Al–0.2C–0.6Si Steel
An austenite-ferrite duplex low-density steel (Fe–12Mn–7Al–0.2C–0.6Si, wt%) was designed and fabricated by cold rolling and annealing at different temperatures. The tensile properties, microstructure evolution, deformation mechanism and stacking fault energy (SFE) of the steel were systemically inve...
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MDPI AG
2022-03-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/7/2498 |
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| author | Shuai Liu Yinlei Ge Huanyou Liu Junyu Liu Yunli Feng Chen Chen Fucheng Zhang |
| author_facet | Shuai Liu Yinlei Ge Huanyou Liu Junyu Liu Yunli Feng Chen Chen Fucheng Zhang |
| author_sort | Shuai Liu |
| collection | DOAJ |
| description | An austenite-ferrite duplex low-density steel (Fe–12Mn–7Al–0.2C–0.6Si, wt%) was designed and fabricated by cold rolling and annealing at different temperatures. The tensile properties, microstructure evolution, deformation mechanism and stacking fault energy (SFE) of the steel were systemically investigated at ambient temperature. Results show two phases of fine equiaxed austenite and coarse band-like δ-ferrite in the microstructure of the steel. With increasing annealing temperature, the yield and tensile strengths decrease while the total elongation increases. At initial strains, the deformation is mainly concentrated in the fine austenite and grain boundaries of the coarse δ-ferrite, and the interior of the coarse δ-ferrite gradually deforms with further increase in the strain to 0.3. No twinning-induced plasticity (TWIP) or transformation-induced plasticity (TRIP) occurred during the tensile deformation. Considering element segregation and two-phase proportion, the chemical composition of austenite was measured more precisely. The SFE of the austenite is 39.7 mJ/m<sup>2</sup>, and the critical stress required to produce deformation twins is significantly higher than the maximum flow stress of the steel. |
| first_indexed | 2024-03-09T11:40:50Z |
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| id | doaj.art-ff6b4f021d4c4165bcb43fc865e72ccf |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T11:40:50Z |
| publishDate | 2022-03-01 |
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| spelling | doaj.art-ff6b4f021d4c4165bcb43fc865e72ccf2023-11-30T23:32:58ZengMDPI AGMaterials1996-19442022-03-01157249810.3390/ma15072498Tensile Properties and Microstructure Evolutions of Low-Density Duplex Fe–12Mn–7Al–0.2C–0.6Si SteelShuai Liu0Yinlei Ge1Huanyou Liu2Junyu Liu3Yunli Feng4Chen Chen5Fucheng Zhang6College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, ChinaCollege of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, ChinaCollege of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, ChinaCollege of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, ChinaCollege of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, ChinaState Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, ChinaCollege of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, ChinaAn austenite-ferrite duplex low-density steel (Fe–12Mn–7Al–0.2C–0.6Si, wt%) was designed and fabricated by cold rolling and annealing at different temperatures. The tensile properties, microstructure evolution, deformation mechanism and stacking fault energy (SFE) of the steel were systemically investigated at ambient temperature. Results show two phases of fine equiaxed austenite and coarse band-like δ-ferrite in the microstructure of the steel. With increasing annealing temperature, the yield and tensile strengths decrease while the total elongation increases. At initial strains, the deformation is mainly concentrated in the fine austenite and grain boundaries of the coarse δ-ferrite, and the interior of the coarse δ-ferrite gradually deforms with further increase in the strain to 0.3. No twinning-induced plasticity (TWIP) or transformation-induced plasticity (TRIP) occurred during the tensile deformation. Considering element segregation and two-phase proportion, the chemical composition of austenite was measured more precisely. The SFE of the austenite is 39.7 mJ/m<sup>2</sup>, and the critical stress required to produce deformation twins is significantly higher than the maximum flow stress of the steel.https://www.mdpi.com/1996-1944/15/7/2498Fe–Mn–Al–C steeldualphase steellowdensity steelδferritestacking fault energy |
| spellingShingle | Shuai Liu Yinlei Ge Huanyou Liu Junyu Liu Yunli Feng Chen Chen Fucheng Zhang Tensile Properties and Microstructure Evolutions of Low-Density Duplex Fe–12Mn–7Al–0.2C–0.6Si Steel Materials Fe–Mn–Al–C steel dualphase steel lowdensity steel δferrite stacking fault energy |
| title | Tensile Properties and Microstructure Evolutions of Low-Density Duplex Fe–12Mn–7Al–0.2C–0.6Si Steel |
| title_full | Tensile Properties and Microstructure Evolutions of Low-Density Duplex Fe–12Mn–7Al–0.2C–0.6Si Steel |
| title_fullStr | Tensile Properties and Microstructure Evolutions of Low-Density Duplex Fe–12Mn–7Al–0.2C–0.6Si Steel |
| title_full_unstemmed | Tensile Properties and Microstructure Evolutions of Low-Density Duplex Fe–12Mn–7Al–0.2C–0.6Si Steel |
| title_short | Tensile Properties and Microstructure Evolutions of Low-Density Duplex Fe–12Mn–7Al–0.2C–0.6Si Steel |
| title_sort | tensile properties and microstructure evolutions of low density duplex fe 12mn 7al 0 2c 0 6si steel |
| topic | Fe–Mn–Al–C steel dualphase steel lowdensity steel δferrite stacking fault energy |
| url | https://www.mdpi.com/1996-1944/15/7/2498 |
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