超薄超高强准晶强化钢箔材制备关键基础

The strength of the steel strengthened by quasicrystal reaches 3000MPa. Foil rolling of ultra high strength is an important novel technology. However, it is still unclear of the special strengthening mechanism of quasicrystal in the steel surface and the interaction mechanism of the lubricants with surface metals of this kind of utral-high strength steel. The strengthening mechanism of a single quasicrystal particle in steels will be studied. Foil rolling of the quasicrystal steel is performed to understand the interaction between lubricants and the surface of the ultral-high stregnth steel foil.The results are expected to provide theoratical guidance to the application of quasicrystal in steels, and provide theoratical guidance to the foil rolling of ultral-high strength steels as well, which is helpful to the upgrading of the steel industry in China.

准晶钢的强度可达3000MPa以上, 是世界上最强的钢种。超高强准晶钢的超薄轧制代表未来金属加工的方向。本项目选用超高强准晶钢为研究对象，研究其超薄轧制过程中的关键基本问题。项目通过高精度超薄轧制实验，重点研究超高强准晶钢超薄轧制时钢中单个准晶颗粒的强化机理和效果，准晶颗粒与纳米润滑油膜的相互作用规律，箔材与润滑油膜固液两相间特殊的强流变规律。弄清箔材表面单个硬质颗粒作用下油膜的破裂准则。同时阐明超薄轧制时，在纳米油膜作用下，箔材的特殊润滑变形机理，为解决超高强金属超薄轧制难变形问题探明道路。其研究成果不仅有望为我国高强度高精度加工润滑提供技术参考和指导，还可能为传统的第二相强化理论、超薄轧制润滑理论等提供新的理论补充。

本项目选用超高强准晶钢为研究对象，研究其超薄轧制过程中的关键基本问题。项目通过高精度超薄轧制实验，重点研究了超高强准晶钢超薄轧制时钢中单个准晶颗粒的强化机理和效果。弄清了第二相（准晶）颗粒在固溶和时效的溶解和析出规律。研究了在动态变形过程中第二相（准晶颗粒）与位错之间的相互作用，阐明了准晶颗粒与纳米润滑油膜的相互作用规律。弄清箔材表面单个硬质颗粒作用下油膜的破裂规律。研究了第二相在轧制过程中表面暴露规律，阐明了暴露在表面的第二相颗粒的运动规律及其与油膜之间的作用，为解决超高强金属超薄轧制难变形问题探明道路。其研究成果有望为我国高强度高精度加工润滑提供技术参考和指导。