Twin-Roll Strip Casting Process for the Production of Clad Strip - Twin-Roll Clad Casting

覆层带材和板材已经在广泛的应用中使用，并且产量相对较大。然而，可用于生产复合产品(冷轧和热轧、爆炸熔覆、合金焊接)的工艺在材料组合上受到限制，并且由于工艺链条长或生产率降低，对于大批量应用来说过于昂贵。毫无疑问，增加廉价包层产品和不同材料组合的应用将带来显著的技术、生态和经济优势。在铝工业中，通过将不同的铝合金浇注在一个铸锭中，在这一方向上取得了进展。由于较高的温度范围和实际钢铁生产工艺的限制，目前不可能将这些技术转移到钢铁生产中。另一种有趣的选择是通过双辊薄带连铸连续生产复合带钢。显然，对于薄带连铸在复合带钢生产中的潜力进行系统而可靠的研究，到目前为止还很少。这一工艺可以浇铸厚度从1 mm到3 mm的带材，为生产降低能耗和排放的复合带提供了重要机会。在IBF使用短条段进行的简化试验中，可以证明，由于快速凝固过程，也可以连接非常不同的材料类别。例如，铜和钛带材嵌在较大的钢带中。因此，本项目主要针对以下几个方面进行研究：1.论证了双辊铸轧工艺实现金属带材连续熔覆的基本可行性。调查与覆层和覆层材料之间可能的厚度比以及所选材料组合有关的工艺限制。评估接头的阻力与铸造参数的关系。为了达到这些目标，将在数值模型的帮助下初步确定适当的带材厚度和铸造参数。将设计和建造用于覆层带的插入系统，并进行初步试验。随后，将对数值模型进行改进，并将进行系统的实验活动，以调查工艺限制和应用潜力。所获得的复合带将在性能和加工可能性方面进行表征。

Cladded strips and plates are already used in a wide spectrum of applications and are produced in relatively significant volumes. However, the available processes for the production of clad products (cold and hot rolling, explosion cladding, alloy welding) are limited in the material combinations and due to long process chain or reduced productivity, too expensive for the application in high production volumes. Without any doubt, an increase in the application of inexpensive clad products and different material combinations would lead to significant technical, ecological and economic advantages. Developments in this direction were made in the aluminum industry by casting different aluminum alloys in a single ingot. It is not currently possible to transfer these technologies in the steel production due to the higher temperature range and the actual steel production processes limitations. An interesting alternative could be the continuous production of clad strip by twin-roll strip casting. Apparently only few researches have been conducted so far to investigate systematically and reliably the potential of thin strip casting for the production of clad strip. This process, in which strips with a thickness ranging from 1 to 3 mm can be cast, offers the important opportunity to produce clad strips with reduced energy consumption and emissions. In simplified trials performed at the IBF using short strip segments it was possible to demonstrate that due to the fast solidification process it is possible to join also very different material classes. As an example, copper and titanium strips embedded in a larger steel strip. Consequently, the proposed project aims at the following main targets:1. Prove the basic feasibility of the continuous cladding of metallic strips with the twin-roll strip casting process.2. Investigate the process limits in relation to the possible thickness ratio between cladding and clad material and the selected material combination.3. Evaluate the resistance of the joint in correlation to the casting parameters.To reach these targets, the proper strip thicknesses and casting parameters will be initially roughly defined with the help of a numerical model. An insertion system for the cladding strip will be designed and constructed and preliminary tests performed. Subsequently, the numerical model will be improved and a systematic experimental campaign will be aimed at the investigation of the process limitations and application potentials. The obtained clad strips will be characterized in terms of properties and processing possibilities.