Microstructure Evolution and Tensile Behaviour of a Cold Rolled 8 Wt Pct Mn Medium Manganese Steel
Microstructure Evolution and Tensile Behaviour of a Cold Rolled 8 Wt Pct Mn Medium Manganese Steel
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DOI：
10.1007/s11661-021-06534-9
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
T. Kwok;P. Gong;X. Xu;J. Nutter;W. M. Rainforth;D. Dye
中科院分区：
文献类型：
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作者：
T. Kwok;P. Gong;X. Xu;J. Nutter;W. M. Rainforth;D. Dye
开发了一种成分为 Fe–8.3Mn–3.8Al–1.8Si–0.5C–0.06V–0.05Sn 的新型中锰钢，并通过热轧和临界退火进行热机械加工。该钢的屈服强度为 1 GPa，抗拉强度为 1.13 GPa，延展性为 41%。为了研究两相区退火后冷轧对后续拉伸性能的影响，将钢进一步冷轧至 20% 的压下量。冷轧后，观察到应变硬化率随着冷轧压下量的增加而持续增加，但在随后的拉伸试验中延展性没有显着下降。分析了冷轧压下量的微观结构演变，以了解这种现象背后的机制。研究发现，冷轧激活了额外的孪晶系统，为随后的拉伸试验中应变诱导马氏体的形成提供了大量有效的成核位点，这可以被描述为增强的 TRIP 效应。
A novel medium manganese steel with composition Fe–8.3Mn–3.8Al–1.8Si–0.5C–0.06V–0.05Sn was developed and thermomechanically processed through hot rolling and intercritical annealing. The steel possessed a yield strength of 1 GPa, tensile strength of 1.13 GPa and ductility of 41 pct. In order to study the effect of cold rolling after intercritical annealing on subsequent tensile properties, the steel was further cold rolled up to 20 pct reduction. After cold rolling, it was observed that the strain hardening rate increased continuously with increasing cold rolling reduction but without a significant drop in ductility during subsequent tensile tests. The microstructural evolution with cold rolling reduction was analysed to understand the mechanisms behind this phenomena. It was found that cold rolling activated additional twinning systems which provided a large number of potent nucleation sites for strain induced martensite to form during subsequent tensile tests in what can be described as an enhanced TRIP effect.