Experiment-based modeling of the correlation between metallurgical processing, 3D microstructure evolution and mechanical properties of pearlitic nodular cast iron

本项目提案旨在建立一个集成的模拟链，用于预测和有针对性地调整3D微观结构的发展和相关的有效性能，作为冶金工艺参数的函数。因此，该项目大大有助于提高理解和更有效地利用冶金过程控制，空间显微组织的发展和球墨珠光体铸铁的机械性能之间的相关性。石墨-珠光体微观结构的形态多样性提供了涵盖广泛的机械性能的一般可能性。然而，到目前为止，一直缺乏数值设计工具，所需的微结构可以调整在一个有针对性的和可重复的方式，关于应用相关的要求。除了结合经过验证的模拟方法之外，连续效应链的建模首先需要其铸铁特定的扩展。这需要对单个微观结构和合金成分的起源和影响有充分的了解。本项目提案通过将实验和数值工作步骤紧密结合来应对这些挑战。对于模型方法的概念设计，首先在高纯合金上实验研究单个元素的机制。在项目过程中，通过系统地扩展合金系统，将该方法扩展到技术合金。模拟链的建模分为三个主要领域：a）石墨相的成核和生长，B）共析珠光体基体的形成和c）单调加载下的本构行为和损伤机制。

The present project proposal aims at establishing an integrated simulation chain for the prediction and targeted adjustment of the 3D microstructure development and associated effective properties as a function of the metallurgical process parameters. The project thus contributes significantly to an improved understanding and more efficient use of the correlation between metallurgical process control, spatial microstructure development and mechanical properties of nodular pearlitic cast iron. The morphological diversity of the graphite-pearlite microstructure offers the general possibility of covering a wide range of mechanical properties. Up to now, however, there has been a lack of numerical design tools with which the desired microstructures can be adjusted in a targeted and reproducible manner with regard to application-relevant requirements. In addition to the combination of proven simulation methods, the modeling of a continuous chain of effects first requires their cast-iron-specific extension. This requires a sound understanding of the origin and effect of the individual microstructure and alloy components. The present project proposal meets these challenges by closely integrating experimental and numerical work steps. For the conceptual design of the model approaches, the mechanisms of individual elements are first investigated experimentally on high-purity alloys. In the course of the project, the approach is extended to technical alloys by systematically extending the alloy system. The modeling of the simulation chain is divided into three main areas: a) nucleation and growth of the graphite phase, b) formation of the eutectoid pearlite matrix and c) constitutive behavior and damage mechanisms under monotonic loading.