Production of thin hot strips of high silicon bearing FeSi-strip using the integrated technology of thin slab casting and hot rolling

在该项目的第一阶段，开发了各种热轧策略，以生产1 mm厚的Fe-2，4wt.-%Si合金热轧带材，使用传统的热轧工艺和先前的加热和薄板坯连铸集成技术，可以证明各个工艺步骤的相互作用以及热带对磁性能的影响。在这两种热轧带钢生产方法中，都可以轧制厚度在1 mm到2.5 mm之间的不同结构和纹理的热轧带钢。热轧带钢可以实现淬火、部分软化和软化等状态。在带材厚度上，磁有利织构和不利织构的织构存在显著差异。对热轧过程进行了实验和模拟研究。为此，通过半经验模型和物理模型对材料的硬化和软化行为进行了实验和模拟研究。对于无取向电工钢板生产的整体观点和连续过程建模，以IMF开发的层模型为基础，对热成形后的材料流动和组织发展进行建模是必不可少的组成部分。分析了热轧带钢对最终退火态组织和磁性能的影响。在第二阶段，将继续进行热轧过程的模拟和热轧过程中组织的发展以及实验工作。目的是定义具有特定磁性的特定应用的热轧带钢组织，以有针对性的方式生产它们，并推导出面向应用的热轧策略。因此，与课题组的其他子项目合作，计划使用一种高硅含量(2.8wt%Si)的合金。这使得研究合金对生产过程的影响，特别是热轧，材料在热成形过程中的行为以及对磁性能的影响成为可能。根据该项目第一阶段的结果，通过调整轧制策略，生产出具有良好的冷轧和磁性能初始状态的薄热轧带钢，从而使预期的热轧带钢退火热带钢具有进一步的组织设置的可能性。还将考虑高硅含量合金的变质硬化和软化行为。各个工艺阶段的子模型与项目合作伙伴相互联系，目的是对理论推导出的工艺参数进行实验成像，并生产出符合演示机定义要求的非颗粒取向的电子片。

Within the first phase of the project, various hot rolling strategies weredeveloped for the production of a thin, 1 mm thick hot strip of the Fe-2,4 wt.-% Si alloy using the conventional hot rolling process withprevious reheating and the integrated thin slab casting technology.The interactions of the individual process steps and the influence ofthe hot strip on the magnetic properties could be demonstrated. Withboth methods of hot strip production, it is possible to roll different hotstrip structures and textures for hot strip thicknesses between 1 mmand 2.5 mm. The hot strip states like hardened, partially softened andsoftened could be realised. Significant differences in texture withmagnetically advantageous and unfavorable textures were foundacross the strip thickness. The hot rolling process was investigatedexperimentally and simulatively. For this purpose, the hardening andsoftening behavior was investigated experimentally and simulativelydescribed by semi-empirically and physically based models. For aholistic view of the production of non-grain-oriented electrical sheetsand of the continuous process modeling, the modeling of the materialflow and the microstructural development after hot forming is anessential component with the layer model developed at the IMF as thebasis. The influence of the hot strip on the structure of the finalannealed samples and on the magnetic properties was also analyzed.In the second phase, the simulation of the hot rolling process and themicrostructure development during hot rolling as well as theexperimental work will be continued. Aim is to define hot stripstructures for specific applications with defined magnetic properties,to produce them in a targeted manner and to derive applicationorientedhot rolling strategies. Therefore, in cooperation with the othersubprojects of the research group, using an alloy with a high Sicontent (2.8 wt.% Si) is planed. This makes it possible to investigatethe influence of the alloy on the production process, especially hotrolling, the material behavior during hot forming and the effects on themagnetic properties. Based on the findings of the first phase of theproject, a thin hot strip is produced with a favorable initial state for thecold rolling and for the magnetic properties by means of adaptationsof the rolling strategies, whereby the intended hot strip annealingoffers further possibilities of the microstructure setting. The alteredhardening and softening behavior of the alloy with high Si content willbe also taken into account. The submodels of the individual processstages are linked to one another in cooperation with the projectpartners with the aim of experimentally imaging the theoreticallyderived process parameters and producing a non-grain-orientedelectrical sheet adapted to the defined requirements of thedemonstrator.