Evaluation of dynamic powder behavior for three Ti alloy s targeting laser and ebeam powder bed additive manufacturing applications

加法制造(AM)是一种颠覆性技术，它直接从数字文件逐层递增地构建非常复杂的对象，这些对象无法通过传统加工来生产。先进粉末和涂层(AP&C)是制造用于AM和金属喷涂涂层的超高性能球形金属粉末的世界领先企业。AP&C正在生产最好的自由流动和无团聚的球形钛基金属粉末，在竞争中产生了卓越的控制和性能效率。AP&C一直希望进一步了解其粉末的特性，以及如何进一步提高粉末质量，以最终在全球范围内了解粉末的特性和成分。这种关系对提高他们的竞争力和产品组合具有战略意义，从而导致业务增长的最终目标。这项建议将提供关于使用一种新的粉末表征工具的可行性和互补性的基准答案：动态休止角(Granudrum)，以更好地了解金属粉末的运动和流变性，这一新兴共识表明，传统的粉末表征技术不足以理解AM加工过程中的粉末行为。建议的测试矩阵将包括三种粉末的静态和动态粉末行为特性：钛-，钛-6242和钛-5553。将确定建议粉末的外在和内在属性之间的关系，以确定最佳的颗粒表面特征，以减轻粘附性和内聚力问题。这些知识将被AP&C用于调整他们的工艺参数，以获得更好的粉末表面特性，并帮助AP&C的客户制定最佳粉末处理实践。

Additive Manufacturing (AM) is a disruptive technology that incrementally builds very complex objectslayer-by-layer directly from a digital file, objects impossible to produce by conventional machining. AdvancedPowders and Coatings (AP&C), is a world leader in fabrication of ultra-high-performance spherical metalpowders engineered for AM and metal spray coatings. AP&C is producing among the best free-flowing andagglomerate-free spherical Ti-based metal powders, yielding superior control and performance efficienciesover competition. AP&C constantly desires to further understand the characteristics of their powders for AMand how powder quality can be further improved to ultimately develop a global understanding between thepowder characteristics and compositions. This relation is strategic to improve their competitiveness andproduct portfolio, leading to the ultimate goal of business growth. This proposal will provide baseline answersregarding the feasibility and complementarity in using a new powder characterization tool: the dynamic angleof repose (Granudrum) to better understand metal powder motion and rheology as an emerging consensusreveals that the traditional powder characterization techniques are insufficient to understand the powderbehavior during AM processing. The proposed test matrix will include static and dynamic powder behaviorproperties for three powders: Ti-64, Ti-6242 and Ti-5553. Identification of the relationships between theextrinsic and intrinsic properties of the proposed powders will be done to identify optimal particle surfacecharacteristics mitigating adhesion and cohesion issues. The knowledge will be usable by AP&C to adjust theirprocessing parameters to obtain improved powder surface characteristics and help in the development of bestpractices for powder handling by AP&C's customers.