Hot Deformation Behaviors and Process Parameters Optimization of Low-Density High-Strength Fe–Mn–Al–C Alloy Steel

Peng Wan; Huixiang Yu; Feng Li; Pengfei Gao; Lei Zhang; Zhengzhi Zhao

doi:10.1007/s12540-021-01144-x

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자료유형: 학술저널

저자정보: Peng Wan (University of Science and Technology Beijing) Huixiang Yu (University of Science and Technology Beijing) Feng Li (University of Science and Technology Beijing) Pengfei Gao (University of Science and Technology Beijing) Lei Zhang (Shandong Iron and Steel Group Rizhao Co. Ltd) Zhengzhi Zhao (University of Science and Technology Beijing)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.10

발행연도: 2022.10

수록면: 2,498 - 2,512 (15page)

DOI: 10.1007/s12540-021-01144-x

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The hot deformation behavior of low-density high-strength Fe–Mn–Al–C alloy steel at T = 900-1150 °C and ̇ = 0.01-10 s−1was studied by the Gleeble-3500 thermo-mechanical simulator. The rheological stress curve characteristics of the steel wereanalyzed through experimental data, and a physical constitutive model considering strain coupling was established. At thesame time, the finite element software DEFORM was used to calculate the critical damage value of the steel, and the influenceof T and ̇ on the maximum damage value was considered. By introducing the dimensionless parameter Zener–Hollomon, thecritical damage model was established. Finally, the workability of the steel was evaluated by using the intuitive processingmap technology. The results indicated that Fe–Mn–Al–C alloy steel is a positive strain rate-sensitive and a negative temperature-sensitive material, and the constitutive model considering physical parameters can well predict the rheological stress ofthe steel during hot deformation (R = 0.997). The critical damage factor of Fe–Mn–Al–C alloy steel varies with the changeof T and ̇ , and the range is 0.359-0.535. At the same time, the critical damage factor is more sensitive to ̇ . At a constantT, the damage factor decreases with the increase of ̇ . Based on the Prasad instability criterion, the dynamic material modelprocessing map and the microstructure verification after thermal compression, the rheological instability characteristics ofthe steel are mainly mechanical instability and local plastic flow, and the stable deformation area is mainly characterized bydynamic recrystallization. The optimal hot working process window of the steel is 975-1050 °C/0.01-0.032 s−1.

#Low-density high-strength alloy steel · DEFORM · Critical damage model · Hot deformation · Processing map technology

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