TP2: Thermomechanical characterization and microstructural analysis of the interaction of shear bands with elements of the microstructure

TP2：剪切带与微观结构元素相互作用的热机械表征和微观结构分析

• 批准号: 506489666
• 负责人: Professor Dr.-Ing. Martin Franz-Xaver Wagner
• 金额: --
• 依托单位: Professur Werkstoffwissenschaft
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/506489666?language=en
• 关键词: TP2; Thermomechanical; characterization; microstructural; analysis

Adiabatic shear band formation occurs as a deformation process in metallic materials particularly at high deformation rates. Shear band formation is characterized by energy dissipation during plastic deformation, which is associated with a local temperature increase that leads to local softening and, finally, to an increasingly pronounced localization of the subsequent deformation. A detailed understanding of shear band formation is interesting from the point of view of materials science, experimentally challenging and also highly relevant from a technological point of view, especially in the context of high-speed blanking. A key objective of this research project is to investigate the influence of different initial microstructures on the formation and growth of different types of shear bands in unalloyed and low-alloyed steels, respectively, as well as in a non age-hardenable aluminum alloy. The project furthermore aims at developing criteria for the evaluation of the shear tendency of the investigated materials during high-speed blanking, with a special focus on strain rate sensitivity, strength and thermal conductivity of the materials. In particular, the aim is to understand the relationships between the initial microstructures and the resulting shear band properties. The focus is not only on the macroscopic investigation of the mechanical behavior but also on the microstructural and micromechanical characterization of shear bands, with additional consideration of the influence of different stress states. Moreover, the cutting surfaces produced by high-speed blanking will be systematically characterized, and conditions for tailoring well-defined surface properties will be identified. Consequently, a significant contribution will be made to the central research goals of the Research Unit by the development of a clear understanding of the relevant microstructural mechanisms – from the initiation of an adiabatic shear band, via its growth and interaction with microstructural features, to the functional surface generated during high-speed blanking.

绝热剪切带的形成是金属材料的一个变形过程，特别是在高变形速率下。剪切带形成的特征在于塑性变形期间的能量耗散，这与导致局部软化的局部温度升高以及最终导致后续变形的日益明显的局部化相关。从材料科学的角度来看，对剪切带形成的详细了解是有趣的，从技术的角度来看，特别是在高速冲裁的背景下，具有实验挑战性和高度相关性。该研究项目的一个关键目标是研究不同初始显微组织对非合金钢和低合金钢以及非时效硬化铝合金中不同类型剪切带形成和生长的影响。该项目还旨在制定高速冲裁过程中所研究材料剪切趋势的评估标准，特别关注材料的应变率敏感性、强度和导热性。特别是，其目的是了解初始微观结构与所得剪切带性质之间的关系。重点不仅是宏观的力学行为的调查，但也对剪切带的微观结构和微观力学特性，与不同的应力状态的影响的额外考虑。此外，高速冲裁产生的切削表面将被系统地表征，并将确定定制定义良好的表面特性的条件。因此，一个显着的贡献，将作出研究单位的中心研究目标的发展，明确理解相关的微观结构机制-从绝热剪切带的启动，通过其增长和与微观结构特征的相互作用，在高速冲裁过程中产生的功能表面。