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| Microstructure and properties as well as deformation behavior in an incritical annealing medium-Mn steel |
| WANG Shuai1,2, CHEN Wei-jian1,2, ZHAO Zheng-zhi1,2, ZHAO Xiao-long3 |
1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China;
2. Beijing Laboratory for Modern Transportation Advanced Metal Materials and Processing Technology, Beijing 100083, China;
3. Carbon Steel and Thin Slab Factory, Hongxing Iron and Steel Co., Ltd., Jiayuguan 735100, Gansu,China |
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Abstract In order to investigate the evolution rule of microstructure of medium manganese steel and its influence on mechanical properties and deformation behavior in an intercritical annealing treatment, a cold-rolled medium manganese steel (0.1C-7Mn-0.35Si) was intercritically annealed from 570 to 650 ℃. The research results show that as the annealing temperature increases, the dual-phase structure containing of austenite plus ferrite structure gradually tends to be equiaxed and the grains become coarsened, and the martensite structure appears at 650 ℃. The tensile strength of the experimental steel increases with increasing temperature, while the elongation and yield strength all show a downward trend; the localized uneven deformation band was gradually weakened and was completely disappeared at 620 and 650 ℃. When annealed at a relatively high annealing temperature, the stimulative deformation-induced martensite transformation inside coarse equiaxed austenite grains and the reduced dynamic recovery in large-sized ferrite grains, as well as the introduction of martensite at higher temperature etc. all enhance the work hardening capability at the yield stage, and hence recede or suppress the propagation of the Lüders band.
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Received: 12 June 2020
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2021, Vol. 56 
