初始柱状晶对无取向电工钢相变柱状晶的影响规律及其形成机理研究

初始柱状晶广泛存在于无取向电工钢的铸锭和连铸坯中，由于凝固过程中的取向择优生长，其往往表现出强的{100}织构。同时，通过控制无取向电工钢相变时的工艺参数，能够制备出{100}或{110}织构柱状晶组织，显著的改善了磁性能。但目前关于初始柱状晶对相变柱状晶组织和织构影响的研究还鲜见报道。因此，本项目拟以Fe-0.5%Mn无取向电工钢为研究材料，开展如下研究：(1)热轧、冷轧变形时初始柱状晶组织和织构的演变规律；(2)初始柱状晶的热轧、冷轧变形对相变柱状晶组织和织构的影响规律。根据以上研究结果，分析初始柱状晶的轧制变形对相变过程中柱状晶组织核心的取向选择、长大行为和织构形成的影响，揭示其对相变柱状晶组织和织构的影响规律，进一步探究相变过程中柱状晶组织和织构的形成机理，相关的成果将对新一代低铁损高磁感无取向电工钢的研究与开发具有重要的理论意义和重大的工程价值。

The initial columnar grains are generally found in the cast ingots and slabs of non-oriented electrical steels. Due to preferential growth of the initial columnar grains, the texture of them is characterized as {100}-fiber. On the other hand, {100} or {110}-textured columnar grains can be obtained by controlling the process parameters during phase transformation for non-oriented electrical steels, which can give excellent magnetic performances. However, the effect of the initial columnar grains on the microstructure and texture of them from phase transformation in non-oriented electrical steels has been rarely reported. Therefore, the project intends to study the influence regulation and mechanism of initial columnar grains on microstructure and texture for them from phase transformation in the Fe-0.5%Mn non-oriented electrical steels. The main research contents are as follows: (1) the microstructure and texture evolution of initial columnar grains during hot rolling and cold rolling; (2) the influence law of hot rolling and cold rolling for initial columnar grains on microstructure and texture for them from phase transformation. According to the above research results, analyses the influence of rolling deformation for initial columnar grains on the orientation preference and growth behavior of nuclei as well as texture for them during phase transformation, reveals the influence regulation of rolling deformation for initial columnar grains on microstructure and texture for them from phase transformation, and investigates the formation mechanism of microstructure and texture for columnar grains during phase transformation. The research results will offer a new perspective on the development of new types of non-oriented electrical steels with low core loss and high magnetic induction.