Mechanical characterization and microstructure modeling of cast layered composites of aluminum/steel hybrids

铝/钢混合材料铸造层状复合材料的机械表征和微观结构建模

• 批准号: 524376761
• 负责人: Professorin Dr.-Ing. Babette Tonn
• 金额: --
• 依托单位: Lehrstuhl für Umformtechnik und Gießereiwesen
• 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/524376761?language=en
• 关键词: Mechanical; characterization; microstructure; modeling; cast

The basis of this research project is the investigation of the bond between aluminum-steel hybrid cylinders produced by continuous composite casting. The fundamental micromechanical and microstructural properties of Aluminium/Steel hybrids are investigated experimentally and by simulation. To this end, a description of the mechanical behavior of continuous-cast material composites over the process chain is being developed. This is based on the microstructural properties of the interface area and takes metallurgical and micromechanical aspects into account. The time-consuming experimental work involved in optimizing the mechanical properties at both the process and metallurgical levels is thus reduced. The interfacial microstructures are analysed and the mechanical behavior of the hybrid is characterized. Different mechanical and optical characterization methods are used. To describe the failure behavior in the composite zone, a model is developed in each case for the formation of the interfacial microstructure as well as for the description of the deformation behavior. This approach allows a more detailed understanding of the complex interaction between the process parameters, the formation and evolution of the interfacial microstructures and the final mechanical behavior of the composite. The results of the metallurgical investigation are incorporated into the model for the formation of the interfacial microstructure. Since the mechanical behavior of the material composites is closely related to the interfacial microstructures, a detailed understanding of the diffusion-reaction behavior at the aluminium/steel interface must be generated. In this context, diffusion reaction experiments are further developed aiming at isolating the time and temperature effects to analyze the kinetic growth of the intermetallic layers. In addition, the experiments allow the calibration and validation of the predictive model for the interfacial evolution. The developed simulation model calculates the influence of the continuous casting process parameters on the intermetallic thickness growth. The results of the mechanical investigation together with the results regarding the formation of the interfacial microstructure are included in the model for the deformation behavior. The deformation and fracture behavior of the interface is analyzed using push-out and Brazilian tests. By matching experimentally determined strain fields with numerical models based on in situ high-speed recordings, both the validation of the underlying elastoplastic material behavior and the identification of suitable predictive models describing the failure of intermetallic phases and adjacent structures are performed.

本研究课题的基础是研究铝-钢复合铸造复合材料筒体的结合性能。通过实验和模拟研究了铝/钢混合材料的基本微观力学和微观组织特性。为此，一个连续铸造材料复合材料的工艺链上的机械行为的描述正在开发。这是基于界面区域的微观结构特性，并考虑到冶金和微观机械方面。从而减少了在工艺和冶金水平优化机械性能所涉及的耗时实验工作。分析了复合材料的界面微观结构，并对其力学行为进行了表征。使用不同的机械和光学表征方法。为了描述在复合区的失效行为，在每种情况下开发的模型的界面微观结构的形成以及变形行为的描述。这种方法可以更详细地了解工艺参数之间的复杂相互作用，界面微观结构的形成和演变以及复合材料的最终力学行为。冶金调查的结果被纳入模型的界面微观结构的形成。由于材料复合材料的力学行为与界面微观结构密切相关，因此必须对铝/钢界面处的扩散反应行为有详细的了解。在这种情况下，扩散反应实验进一步发展，旨在隔离的时间和温度的影响，分析的金属间化合物层的动力学生长。此外，实验允许的界面演变的预测模型的校准和验证。所开发的模拟模型计算了连铸工艺参数对金属间化合物厚度增长的影响。力学研究的结果连同关于界面微观结构的形成的结果被包括在变形行为的模型中。采用推出试验和巴西试验分析了界面的变形和断裂行为。通过将实验确定的应变场与基于原位高速记录的数值模型相匹配，执行基本弹塑性材料行为的验证和描述金属间相和相邻结构的失效的合适的预测模型的识别。