Laser Direct Energy Deposition (DED-LB) System

新制造技术和材料教席的研究重点在于开发新的材料概念，利用计算机辅助和实验方法考虑相关的制造技术。除了熔炼和粉末冶金工艺的材料开发外，还特别关注添加剂制造的材料开发。所考虑的材料组包括耐腐蚀钢、碳马氏体淬火工具钢、难熔金属、功能材料和耐磨复合材料。在未来，主席将更多地专注于激光直接能量沉积(DED-LB)工艺的材料开发。除了为DED-LB工艺开发适用的材料概念外，还必须回答有关凝固过程中微结构形成过程和交变热输入的科学问题。研究的目的是了解工艺参数、形成的显微组织和相关的局部材料性能之间的相互作用。在技术问题的背景下，必须制定战略，制造分级或混合多材料概念或调整所需的性能，以供随后对DED-LB处理的部件进行热处理。其他专业领域对Bergische Universityät Wuppertal(BUW)使用该系统的兴趣也很高，这些问题涉及产品质量、生成拓扑优化的部件结构的可能性以及功能材料及其性能的加工。在北威大学，适当的实验室设备可用于工艺适应材料的开发。在这方面，应该提到粉末雾化系统和必要的测量和分析技术，用于粉末材料和DED-LB处理的大块样品的表征和分类。因此，DED-LB系统是对现有实验室设备的有益补充，并将使材料开发变得灵活和快速。对于所描述的可能的研究应用范围，应用了最先进的系统，其中包括用于加工铜和铝基材的输出为1.8kW的蓝色半导体激光器和功率为4kW的近红外半导体激光器，以更经济地加工钢。混合结构的制造和多材料设计应该通过集成四个送粉器来实现。在本申请中，使用非接触式扫描系统在具有复杂几何形状的衬底上提供工具的修复和结构的制造。

The research focus of the Chair for New Manufacturing Technologies and Materials lies in the development of new material concepts, considering the relevant manufacturing technologies using computer-aided and experimental methods. In addition to material development for the melting and powder metallurgical processes, particular focus is attributed to the material development for additive manufacturing. The material groups considered include the group of corrosion-resistant steels, carbon-martensitic hardenable tool steels, refractory metals, functional materials, and wear-resistant composite materials. In the future, the chair will focus more on material development for the Laser-Direct Energy Deposition (DED-LB) process. In addition to developing adapted material concepts for the DED-LB process, scientific questions regarding the microstructure formation process during solidification and the alternating heat input have to be answered. The research aim is to understand the interaction between the process parameters, the microstructure formed, and the associated local material properties. In the context of technological issues, strategies for manufacturing graded or hybrid multi-material concepts or adjusting the required properties for use by subsequent heat treatment of DED-LB-processed components have to be developed. There is also a high level of interest in using the system at the Bergische Universität Wuppertal (BUW) by other specialist areas, with questions relating to product quality, the possibility of generating topology-optimized component structures and the processing of functional materials and their properties. At BUW, appropriate laboratory equipment can be used for process-adapted material development. In this context, a powder atomization system and the necessary measurement and analysis technology for the characterization and classification of powder materials and the DED-LB-processed bulk specimens should be mentioned. Thus, the DED-LB system is a useful addition to the existing laboratory equipment and would enable flexible and rapid material development. For the described range of possible research applications, a state-of-the-art system is applied, which has a blue diode laser with an output of 1.8 kW for processing Cu and Al base materials and a near-infrared Diode laser with a power of 4 kW for the more economical processing of steel. The manufacture of hybrid structures and a multi-material design should be made possible by integrating four powder feeders. The repair of tools and the manufacturing of structures on substrates with complex geometric shapes are provided in this application using a non-contact scanning system.