Computertomographic investigation and FE simulation of the impact of manufacturing process parameters and service conditions on the microstructure and the properties of selected material systems

在这一方案中，应用了一种X射线层析显微镜(XTM)，它适合于用微焦点X射线管进行特殊的显微层析分析技术。有了新的XTM，将绕过多特蒙德大学现有的µCT扫描系统的限制，这些系统只利用直接几何放大。所要求的XTM的主要优点之一在于，在样品到X射线源的大距离处可以保持真正的亚微米尺度的空间分辨率。另一个关键优点是，可以通过精细的成像技术获得有关样品的额外信息，例如相位对比断层扫描、双能量断层扫描或衍射对比断层扫描。有了这种高性能的XTM，将讨论不同的研究主题：-材料开发和工程：制造对AM和PM制造的材料、颗粒和纤维增强的金属和塑料基复合材料以及热喷涂涂层的微观结构和机械行为的影响-生产工程：金属工程和材料加工对微观结构的影响；过滤系统的局部特性对颗粒沉积的影响-生物医学工程：表面结构、化学修饰和曲率对生物膜生长的影响以及血管系统中血液流动的有限元模拟，以预测动脉瘤的破裂并优化支架和弹簧圈的几何形状。在上述研究领域，XTM将用于获取具有最高空间和对比度分辨率的材料系统的3D图像。计划进行各种现场试验，将为其设计和建造试验台。因此，申请者将记录和分析(亚)微米级别的微结构变化，这些变化是由加工或机械、腐蚀、腐蚀或热负荷引起的。利用所提出的基于层析图像的实验和多尺度模拟之间的联系，将在分项研究领域中获得必要的知识。此外，结合断层扫描收集的高分辨率3D数据和互补成像技术的结果(例如，带EDX的扫描电子显微镜、EBSD)将是推断对观察到的现象和效应的理解的关键因素。

In this proposal, an X-ray tomographic microscope (XTM) is applied for, which is suitable to conduct special microtomographic analysis techniques with a microfocus X-ray tube. With the new XTM, the restrictions of the µCT scanning systems which exist at TU Dortmund and which only exploit the direct geometric magnification will be circumvented. One of the key advantages of the requested XTM lies in the fact that true spatial resolution down to submicron scale can be maintained at large distances of the specimen to the X-ray source. A further key advantage is that additional information about the specimen can be obtained by elaborate imaging techniques such as phase contrast tomography, dual energy tomography or diffraction contrast tomography. With this high performance XTM, different research topics will be addressed:- Materials development and engineering: Impact of the manufacturing on the microstructure and the mechanical behavior of AM- and PM-fabricated materials, particle- and fiber-reinforced metal and plastic matrix composites and thermally sprayed coatings- Production engineering: Influence of metal engineering and machining of materials on the microstructure; Effect of local properties in filtering systems on the deposition of particles- Biomedical engineering: Effect of surface structuring, chemical modification and curvature on biofilm growth and FE simulations of blood flow in vascular systems to predict the rupture of aneurysms and to optimize stent and coil geometriesIn the above mentioned research fields the XTM will be used to acquire 3D images of the material systems with highest spatial and contrast resolution. Miscellaneous in situ experiments are planned for which test rigs will be designed and built. Thereby, the applicants will record and analyze microstructural changes on the (sub)micrometer level which are caused by processing or by mechanical, corrosive, erosive or thermal load. Using the proposed connection of between experiments and multiscale simulations based on tomographic images an essential gain of knowledge will be achieved in the itemized research fields. Additionally, the combination of the tomographically collected high resolution 3D data with the results of complementary imaging techniques (e.g. SEM with EDX, EBSD) will be a key element to deduce the understanding of the observed phenomena and effects.