Optimizing the synergy of strength and ductility in a Fe–18Mn–8Al–1C–5Ni lightweight steel by adjusting the distribution, volume fraction and size of B2 phases and κ-carbides
Current study presents a way to control precipitates in a designed Fe–18Mn–8Al–1C–5Ni (wt.%) lightweight steel through annealing and aging treatment. The main objective is to obtain refined and homogeneously distributed B2 phases and intra-granular κ-carbides to enhance mechanical properties. After...
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2025-01-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424028503 |
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| author | P. Li H.L. Sun N. Xiao H. Ding X.F. Guo |
| author_facet | P. Li H.L. Sun N. Xiao H. Ding X.F. Guo |
| author_sort | P. Li |
| collection | DOAJ |
| description | Current study presents a way to control precipitates in a designed Fe–18Mn–8Al–1C–5Ni (wt.%) lightweight steel through annealing and aging treatment. The main objective is to obtain refined and homogeneously distributed B2 phases and intra-granular κ-carbides to enhance mechanical properties. After annealing, the microstructure consists of recrystallized austenite with polygonal B2 phases along grain boundaries (GB-B2) and intra-granular B2 phases (IG-B2). Subsequent aging leads to the newly dual-precipitation of both nanoscale IG-B2 particles and coherent κ-carbides within the grains. As a result, the aged steel exhibited a remarkable ultra-high strength (yield strength of 1220 MPa, tensile strength of 1423 MPa) and a total elongation of 35.8%. The optimized precipitation of GB-B2 (∼360 nm) and IG-B2 (∼150 nm) particles as well as coherent κ-carbides intra-granularly (∼2.6 nm) contributes to enhancing strength significantly with maintaining good ductility. Meanwhile, due to the non-shearing characteristic of GB-B2 and high-density IG-B2 particles, the investigated steel exhibits distinct enhancement of work hardening ability compared to lightweight steels reinforced with single κ-carbides precipitates. These findings provide valuable insights for designing high-performance lightweight steels by tailoring the precipitation configuration. |
| format | Article |
| id | doaj-art-3c0225946817423f8dc83a78fcf1d150 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-3c0225946817423f8dc83a78fcf1d1502025-01-19T06:25:11ZengElsevierJournal of Materials Research and Technology2238-78542025-01-0134501510Optimizing the synergy of strength and ductility in a Fe–18Mn–8Al–1C–5Ni lightweight steel by adjusting the distribution, volume fraction and size of B2 phases and κ-carbidesP. Li0H.L. Sun1N. Xiao2H. Ding3X.F. Guo4School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, ChinaSchool of Materials Science and Engineering, Northeastern University, Shenyang, 110819, ChinaAnalytical and Testing Center, Northeastern University, Shenyang, 110819, ChinaSchool of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China; State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, China; Key Laboratory of Lightweight Structural Materials, Northeastern University, Shenyang, 110819, China; Corresponding author. School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China.School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China; State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai, 200444, China; Corresponding author. School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China.Current study presents a way to control precipitates in a designed Fe–18Mn–8Al–1C–5Ni (wt.%) lightweight steel through annealing and aging treatment. The main objective is to obtain refined and homogeneously distributed B2 phases and intra-granular κ-carbides to enhance mechanical properties. After annealing, the microstructure consists of recrystallized austenite with polygonal B2 phases along grain boundaries (GB-B2) and intra-granular B2 phases (IG-B2). Subsequent aging leads to the newly dual-precipitation of both nanoscale IG-B2 particles and coherent κ-carbides within the grains. As a result, the aged steel exhibited a remarkable ultra-high strength (yield strength of 1220 MPa, tensile strength of 1423 MPa) and a total elongation of 35.8%. The optimized precipitation of GB-B2 (∼360 nm) and IG-B2 (∼150 nm) particles as well as coherent κ-carbides intra-granularly (∼2.6 nm) contributes to enhancing strength significantly with maintaining good ductility. Meanwhile, due to the non-shearing characteristic of GB-B2 and high-density IG-B2 particles, the investigated steel exhibits distinct enhancement of work hardening ability compared to lightweight steels reinforced with single κ-carbides precipitates. These findings provide valuable insights for designing high-performance lightweight steels by tailoring the precipitation configuration.http://www.sciencedirect.com/science/article/pii/S2238785424028503Lightweight steelPrecipitation strengtheningB2 phaseκ-carbidesStrain hardening ability |
| spellingShingle | P. Li H.L. Sun N. Xiao H. Ding X.F. Guo Optimizing the synergy of strength and ductility in a Fe–18Mn–8Al–1C–5Ni lightweight steel by adjusting the distribution, volume fraction and size of B2 phases and κ-carbides Journal of Materials Research and Technology Lightweight steel Precipitation strengthening B2 phase κ-carbides Strain hardening ability |
| title | Optimizing the synergy of strength and ductility in a Fe–18Mn–8Al–1C–5Ni lightweight steel by adjusting the distribution, volume fraction and size of B2 phases and κ-carbides |
| title_full | Optimizing the synergy of strength and ductility in a Fe–18Mn–8Al–1C–5Ni lightweight steel by adjusting the distribution, volume fraction and size of B2 phases and κ-carbides |
| title_fullStr | Optimizing the synergy of strength and ductility in a Fe–18Mn–8Al–1C–5Ni lightweight steel by adjusting the distribution, volume fraction and size of B2 phases and κ-carbides |
| title_full_unstemmed | Optimizing the synergy of strength and ductility in a Fe–18Mn–8Al–1C–5Ni lightweight steel by adjusting the distribution, volume fraction and size of B2 phases and κ-carbides |
| title_short | Optimizing the synergy of strength and ductility in a Fe–18Mn–8Al–1C–5Ni lightweight steel by adjusting the distribution, volume fraction and size of B2 phases and κ-carbides |
| title_sort | optimizing the synergy of strength and ductility in a fe 18mn 8al 1c 5ni lightweight steel by adjusting the distribution volume fraction and size of b2 phases and κ carbides |
| topic | Lightweight steel Precipitation strengthening B2 phase κ-carbides Strain hardening ability |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424028503 |
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