动态相变制备超细晶钢理论研究进展  

Research on ultrafine grain steel prepared by dynamic transformation

作　　者：叶其斌[1] 王益民 阚立烨 王红涛 田勇[1] 王昭东[1] YE Qibin;WANG Yimin;KAN Liye;WANG Hongtao;TIAN Yong;WANG Zhaodong(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《轧钢》2021年第3期64-69,共6页Steel Rolling

基　　金：国家自然科学基金项目(51674081)。

摘　　要：晶粒细化能够同时提高钢铁材料的强度和韧性,但工业应用最广泛的TMCP技术对显微组织的细化存在极限,通常仅能将晶粒细化至5μm。利用动态相变(DT)技术能够制备出晶粒尺寸小于2μm的超细晶钢,对于满足工业发展需求具有重要意义。介绍了动态相变理论的研究进展,主要综述了动态相变形核驱动力、形核方式以及流变应力等方面的研究,以及变形参数、原奥氏体晶粒尺寸和化学成分等因素对超细晶铁素体形成影响的研究。最后指出,利用动态相变技术可以解决TMCP轧制过程中晶粒尺寸细化程度受限、轧制负荷偏大的难题并降低形成超细晶所需的应变,是TMCP技术新的发展方向之一。Grain refinement can improve the strength and toughness of steel materials at the same time, but the most widely used TMCP technology in the industry has a limit to the refinement of the microstructure, and usually it can only refine the grains to 5 μm. The ultrafine grain steel of grain size less than 2 μm can be developed by dynamic transformation(DT)technology, which is of great significance for meeting the needs of industrial development. The research progress of dynamic transformation theory was introduced, mainly reviewing the research on the nucleation driving force, nucleation method and flow stress of dynamic transformation, as well as the research on the influence of deformation parameters, original austenite grain size and chemical composition on the formation of ultrafine grain ferrite. Finally, it was pointed out that the use of dynamic transformation technology could solve the problems of limited grain size refinement and high rolling load during TMCP rolling and reduce the strain required to form ultrafine grains, which was one of the new development fields of TMCP technology.

关 键 词：动态相变 超细晶钢 铁素体动态再结晶 TMCP 轧制负荷 应变 

分 类 号：TG142[一般工业技术—材料科学与工程]