Application of a Fast Phase Transformation Model on the Run Out Table of a Narrow Strip Hot Rolling Mill

贝氏体钢适用于需要高强度的应用，并且越来越多地替代微合金钢，例如称为S 600 MC和S 700 MC的常用等级。其显微组织由稍富碳的贝氏体铁素体和碳化物组成。贝氏体相变是一种复杂的相变过程，它是部分扩散控制的，且相变机制随温度变化而变化。目前的水控制模型上的运行表（ROT）在工业工厂已被证明是无效的，这些贝氏体钢牌号。贝氏体转变发生在贝氏体开始温度（Bs）以下和马氏体开始温度（Ms）以上。因此，在ROT上的带材中的时间-温度曲线必须被控制为位于最迅速的贝氏体转变温度区域中，使得贝氏体转变是最可行的，并且可以避免不希望的相变，例如马氏体或珠光体。在该项目中开发的贝氏体相变模型-多相钢热轧过程中微观组织演变和机械性能的模拟、优化和控制-SPP 1204将在工业生产线上实施。该知识转移项目的结果将提供有关中宽带材冷却段的更详细信息，并有助于更好地了解转化过程。这将提供全面的实验的选择和限制，为进一步发展的SPP 1204贝氏体相变模型。这将简化未来的模型和钢材开发，通过在产品开发过程中应用科学方法来减少试错实验的使用。

Bainitic steels serve the applications where high strength is needed and increasingly substitute micro-alloyed steels, for example common used grades known as S 600 MC and S 700 MC. Their microstructure is composed of slightly carbon enriched bainitic ferrite and carbide. The bainite transformation is rather complicated as it is partially diffusion controlled and the transformation mechanism changes with temperature. The current water controlling model on the Run-Out-Table (ROT) at the industrial plant has been shown to be invalid for these bainitic steel grades. The bainite transformation takes place below the bainite start (Bs) and above the martensite start temperature (Ms). Thus the time-temperature profile in the strip on the ROT must be controlled to lie in the most prompt bainite transformation temperature region so that the bainite transformation is the most feasible and unwanted phase transformation such as martensite or pearlite can be avoided. The bainite phase transformation model being developed in the project - Simulation, Optimisation and Control of Microstructure Evolution and Mechanical Properties during Hot Rolling of Multiphase Steels -, SPP1204, will be implemented in an industrial production line. The results of this knowledge transfer project will give more detailed information about the medium-wide strip cooling section and help to gain better understanding of the transformation processes. It will provide by full-scale experiments the options and constraints for further development of the SPP1204 bainite transformation model. This will ease future model and steel developments, reducing the use of trial and error experiments by applying scientific approaches in the product development process.