Modelling of the impact of the thermo-mechanical load collective on the rim zone microstructure when cutting TiAl6V4

切削 TiAl6V4 时热机械载荷集体对边缘区微观结构影响的建模

• 批准号: 538254789
• 负责人: Professor Dr.-Ing. Thomas Bergs
• 金额: --
• 依托单位: Werkzeugmaschinenlabor - WZL
• 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/538254789?language=en
• 关键词: Modelling; impact; thermo; mechanical; load

The rotating components of a jet engine are highly safety-critical parts. In the worst case, a technical defect in those components can cause loss of human life. The functionality and operational behavior of these components is strongly influenced by the properties of the component’s rim zone, which in turn is defined by the final manufacturing process. Therefore, the machining process, as the final manufacturing process in the production chain, has a considerable influence on the component properties. An important parameter for the characterization of the surface rim zone is the grain size. Thereby, the thermo-mechanical loads that are induced by the manufacturing process affect the grain size. The underlying causes and mechanisms are unknown, which is why existing models to describe the alteration of the grain size have only insufficient predictive accuracy. Within the scope of this research project a model-based description of machining induced grain size alteration for the titanium alloy Ti-6Al-4V will be developed. For this purpose, a thermodynamic approach will be used. The description of the model will be derived via complementary investigation methods. On the one hand, empirical machining investigations and their metallographic evaluations and on the other hand, chip formation simulations are utilized. The influence of the machining process on the material’s grain size, measured on the basis of empirical tests, are related to the local material loads calculated from chip formation simulations. In addition, analytical models will be used, which allow the consideration of material-specific properties. With the model of the grain size alteration and the integration of the model into a FEM-chip formation simulation, the need for a continuous description of the effect of the cutting process on the grain size in the sense of a simulation-supported process design will be fulfilled.

喷气发动机的旋转部件是高度安全关键的部件。在最坏的情况下，这些部件中的技术缺陷可能会造成生命损失。这些部件的功能和操作行为受到部件边缘区域特性的强烈影响，而该特性又由最终制造工艺决定。因此，机械加工工艺作为生产链中的最终制造工艺，对零件的性能有相当大的影响。表征表面轮廓区的一个重要参数是晶粒度。因此，制造过程中产生的热机械载荷会影响晶粒度。潜在的原因和机制尚不清楚，这就是为什么现有的描述颗粒尺寸变化的模型预测精度不够。在本研究项目的范围内，将开发基于模型的钛合金Ti-6Al-4V的加工诱导晶粒度变化的描述。为此，将使用热力学方法。模型的描述将通过补充调查方法得出。一方面利用经验加工研究及其金相评价，另一方面利用切屑形成模拟。在经验测试的基础上测量的加工工艺对材料晶粒度的影响与通过切屑形成模拟计算的局部材料载荷有关。此外，还将使用分析模型，该模型允许考虑材料的特定属性。利用晶粒度变化模型并将该模型集成到有限元切屑形成模拟中，将满足在仿真支持的工艺设计意义上连续描述切割过程对晶粒度的影响的需要。