论文标题
细粒中钢钢的twip和强度行程的相对贡献
The relative contributions of TWIP and TRIP to strength in fine grained medium-Mn steels
论文作者
论文摘要
处理成分FE-4.8MN-2.8AL-1.5SI-0.51C（wt。\％）的中等水平钢，以获得两种不同的微观结构，这些微结构代表热滚动厂中两种不同的方法，从而导致等亚线与混合的Equiaxed和lamellar微结构。发现两者都表现出同时的TIP $+$ TRIP可塑性增强机制，其中变形双胞胎和$α'$ - Martensite独立于双重菌株而形成的Martensite。进行了中断的拉伸试验，以研究两个微观结构之间的变形结构的差异。一种本构模型被用来发现，令人惊讶的是，孪生对合金的强度相对较小，这主要是由于良好的初始滑动长度随后产生了相对较小的谷物细分工作加强工作的机会。然而，与同等的双相钢（2-3 wt \％Mn）相比，具有较低的高成本合金添加功能，并且中等MN TWIP $+$ TRIP Steels仍然代表着未来开发的有吸引力的领域。
A medium Mn steel of composition Fe-4.8Mn-2.8Al-1.5Si-0.51C (wt.\%) was processed to obtain two different microstructures representing two different approaches in the hot rolling mill, resulting in equiaxed vs. a mixed equiaxed and lamellar microstructures. Both were found to exhibit a simultaneous TWIP$+$TRIP plasticity enhancing mechanism where deformation twins and $α'$-martensite formed independently of twinning with strain. Interrupted tensile tests were conducted in order to investigate the differences in deformation structures between the two microstructures. A constitutive model was used to find that, surprisingly, twinning contributed relatively little to the strength of the alloy, chiefly due to the fine initial slip lengths that then gave rise to relatively little opportunity for work hardening by grain subdivision. Nevertheless, with lower high-cost alloying additions than equivalent Dual Phase steels (2-3 wt\% Mn) and greater ductility, medium-Mn TWIP$+$TRIP steels still represent an attractive area for future development.
