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

包覆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，可用于生产覆层产品的工艺（冷轧和热轧、爆炸覆层、合金焊接）在材料组合方面受到限制，并且由于工艺链长或生产率降低，对于大批量应用而言过于昂贵。毫无疑问，增加使用廉价的覆层产品和不同的材料组合将带来重大的技术、生态和经济优势。通过在一个铸锭中铸造不同的铝合金，铝工业在这个方向上取得了发展。由于较高的温度范围和实际钢铁生产工艺的限制，目前还不可能将这些技术转移到钢铁生产中。一种有趣的替代方法是通过双辊带钢连铸来连续生产复合带钢。显然，到目前为止，系统可靠地研究薄带连铸用于生产复合带钢的潜力的研究还很少。该工艺可以铸造厚度在1到3毫米之间的带材，为生产降低能耗和排放的复合带材提供了重要的机会。在IBF使用短条段进行的简化试验中，有可能证明，由于快速凝固过程，也有可能加入非常不同的材料类别。作为一个例子，铜和钛条嵌入在一个较大的钢带。因此，拟议的项目旨在实现以下主要目标：验证了采用双辊连铸工艺对金属带材进行连续包覆的基本可行性。研究与包层和包层材料之间可能的厚度比和所选材料组合有关的工艺限制。根据铸造参数对接头的阻力进行评估。为了达到这些目标，适当的带钢厚度和铸造参数将在数值模型的帮助下初步大致确定。将设计和建造包层带的插入系统，并进行初步试验。随后，将对数值模型进行改进，并进行系统的实验活动，旨在研究该工艺的局限性和应用潜力。所获得的包层带材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.