科学家经过近百年研究，开发出Al、Ti、Mg及Cu等超塑性能的金属与合金，但用量超过80%的量大面广的低成本的低中碳钢不具备超塑性特性。经过近5年的低中碳钢的合金化设计、超细晶组织调控以及高温拉伸行为研究，申请者通过FeMnAlC合金化设计和超细晶组织结构调控，开发出具有应变速率和高超塑性延伸率的低成本低中碳钢。本项目计划通过奥氏体稳定化元素(C/Mn)、铁素体稳定化元素(Al)和纳米析出相控制元素(Nb/V/Ti)等合金化设计、超细晶微观组织调控和超塑性行为研究，形成可工业化、低成本、高应变速率和高超塑性延伸率的低中碳钢合金化体系和组织性能调控技术。本研究结果将建立化学成分、工艺参数与超塑性组织性能间的关系，揭示新型低中碳钢的合金化机理、组织结构调控机理以及超塑性机制，开辟出非常具有前景的低中碳钢的超塑性研究方向。

Over 100years study, many metals and alloys ,such as Al, Ti, Mg and Cu, were developed to assume the superplastic properties, but the low to medium carbon steel with large quantity of 80% in metallic materials were still non-superplastic materials. With about 5 years research on the alloying design, ultrafine microstructure control and high temperature tensile study, the low carbon steels with high strain rate and high superplastic elongation were developed. In this project, our objective is develop the superplastic low to medium carbon alloy with high strain rate and high elongation by the systemetic study on the alloy design system, ultrafine microstructure control and their superplasticity. The results would give us the relationship among the chemical composition, technique parameters and the superplastic properties of the studied superplastic low to medium carbon steel, clearify the mechanisms of the alloying design, the microstructure control and their superplasticity, which would open a promising way on superplasticity of low to medium carbon steel.