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

采用薄板坯连铸热轧一体化技术生产高硅硅铁薄带材

• 批准号: 255681924
• 负责人: Professor Dr.-Ing. Rudolf Kawalla
• 金额: --
• 依托单位: Institut für Metallformung
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/255681924?language=en
• 关键词: Production; thin; hot; strips; silicon

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.

在该项目的第一阶段，开发了各种热轧策略，使用传统的热轧工艺（预先再加热）和集成薄板生产 1 毫米厚的 Fe-2,4 wt.-% Si 合金热轧带材。板坯连铸技术。可以证明各个工艺步骤的相互作用以及热轧带材对磁性能的影响。通过这两种热轧带钢生产方法，可以轧制不同结构和纹理的热轧带钢厚度在 1 毫米至 2.5 毫米之间。热带钢可实现硬化、部分软化、软化等状态。在带材厚度上发现有利磁性和不利磁性织构的显着差异。对热轧工艺进行了实验和模拟研究。为此，通过半经验和物理模型对硬化和软化行为进行了实验研究和模拟描述。对于非晶粒取向电工板材生产和连续过程建模的整体观点来说，热成型后材料流和微观结构发展的建模是一个重要组成部分，以 IMF 开发的层模型为基础。还分析了热带钢对最终退火样品的组织和磁性能的影响。在第二阶段，将继续热轧过程的模拟和热轧过程中的微观组织发展以及实验工作。目的是为具有特定磁性能的特定应用定义热轧带钢结构，以有针对性的方式生产它们，并得出面向应用的热轧策略。因此，与课题组其他子项目合作，计划采用高Si含量（2.8 wt.% Si）的合金。这使得研究合金对生产过程（尤其是热轧）的影响、热成型过程中的材料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研究结果，通过调整轧制策略，生产出具有良好冷轧初始状态和磁性能的薄热轧带钢，从而为预期的热轧带钢退火提供了进一步调整微观结构的可能性。高硅含量合金的硬化和软化行为的改变也将被考虑在内。与项目合作伙伴合作，各个工艺阶段的子模型相互关联，目的是对理论推导的工艺参数进行实验成像，并生产出适合演示器定义要求的非晶粒取向电工板。