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

基于实验的珠光体球墨铸铁冶金加工、3D 微观结构演变和机械性能之间相关性的建模

• 批准号: 504974025
• 负责人: Professor Dr.-Ing. Christoph Broeckmann
• 金额: --
• 依托单位: Access e.V.
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/504974025?language=en
• 关键词: Experiment; based; modeling; correlation; between

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.

本项目旨在建立一个集成的模拟链，用于预测和有针对性地调整三维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，该项目有助于提高对冶金过程控制、空间微观结构发展和球墨珠光体铸铁力学性能之间的相关性的理解和更有效的利用。石墨-珠光体微观结构的形态多样性提供了覆盖广泛力学性能的一般可能性。然而，到目前为止，还缺乏数值设计工具，可以根据应用相关要求以有针对性和可重复的方式调整所需的微观结构。除了结合成熟的仿真方法外，连续效应链的建模首先需要它们的铸铁特定扩展。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。本项目提案通过紧密结合实验和数值工作步骤来应对这些挑战。对于模型方法的概念设计，首先在高纯合金上对各个元素的作用机理进行了实验研究。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。