Laser beam joint welding of complex powder bed based additive manufactured components

基于复杂粉末床的增材制造部件的激光束接头焊接

• 批准号: 429808811
• 负责人: Dr.-Ing. Kai Hilgenberg
• 金额: --
• 依托单位: Abteilung 9: Komponentensicherheit
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/429808811?language=en
• 关键词: Laser; beam; joint; welding; complex

Components can be manufactured close to their final dimensions using additive manufacturing processes such as LBM for Laser Beam Melting (also known as Selective Laser Melting, SLM). A major advantage of these manufacturing processes is that filigree and highly complex structures can be realized that cannot be produced using conventional methods or can only be produced at great expense. The aim of the research proposal is to investigate the application of laser beam welding of LBM-manufactured components made of AISI 316L and Inconel 718.Findings on material and structure-specific properties of laser beam welded joints between additive manufactured components are to be developed in a three-stage approach. The three stages represent three different degrees of complexity of the additively produced components. Welding strategies are to be developed which can guarantee safe joints and the welding suitability of simple to complex component geometries (e.g. lattice structures).Within this framework, basic knowledge for the safe joining of complex LBM-manufactured components is to be developed. In a subsequent step, the material aspect of a precipitation-hardening nickel-based alloy will also be examined with the aim of investigating the microstructure of the joint and its influenceability. At the same time, an understanding of the influence of the LBM-typical microstructure on the welding process will be created. Finally, the findings will be transferred into general welding strategies and models. In analogy to existing approaches regarding the determination of t8/5 cooling times, approaches for the case of additive components will be developed, taking into account the thermal conductivity, density and complexity of the LBM component. The results of the project applied for can provide a basic understanding of the influence of LBM-typical microstructures and defects on the thermal conductivity of the materials and the effect on the welding process. This will provide the basis for the reliable joining of complex LBM-manufactured components and the influence of the joining process on the material properties will be developed primarily on a representative, precipitation-hardening alloy (Inconel 718).

可以使用增材制造工艺（例如用于激光束熔化的LBM（也称为选择性激光熔化，SLM））来制造接近其最终尺寸的部件。这些制造工艺的主要优点在于，可以实现使用常规方法无法生产或只能以很高的成本生产的精细和高度复杂的结构。该研究提案的目的是研究激光束焊接在由AISI 316L和Inconel 718制成的LBM制造部件中的应用。增材制造部件之间激光束焊接接头的材料和结构特定特性的研究结果将通过三个阶段的方法进行开发。这三个阶段代表了增材制造组件的三种不同复杂程度。焊接策略的制定应能保证简单到复杂几何形状的部件（如网格结构）的安全连接和焊接适用性。在此框架内，应开发复杂LBM制造部件安全连接的基本知识。在随后的步骤中，还将检查沉淀硬化镍基合金的材料方面，目的是研究接头的微观结构及其影响能力。与此同时，LBM典型的微观结构对焊接过程的影响的理解将被创建。最后，研究结果将被转移到一般的焊接策略和模型。类似于现有的关于确定t8/5冷却时间的方法，将开发用于添加剂组分的情况的方法，考虑LBM组分的热导率、密度和复杂性。申请项目的结果可以为LBM典型组织和缺陷对材料热导率的影响以及对焊接工艺的影响提供基本的了解。这将为LBM制造的复杂部件的可靠连接提供基础，并且将主要在具有代表性的沉淀硬化合金（Inconel 718）上开发连接过程对材料性能的影响。