Rendiconti Lincei. Scienze Fisiche e Naturali ( IF 1.810 ) Pub Date : 2021-05-12 , DOI: 10.1007/s12210-021-00994-2 Francesco Grazzi , Carlo Cialdai , Marco Manetti , Mirko Massi , Maria Pia Morigi , Matteo Bettuzzi , Rosa Brancaccio , Fauzia Albertin , Takenao Shinohara , Tetsuya Kai , Anna Fedrigo , Adriano Di Giovanni , Francesco Arneodo , Rodrigo Torres , Oraib Al-Ketan , Jumaanah Elhashemi , Francesco Taccetti , Lorenzo Giuntini
In this paper, we have studied an additively manufactured metallic component, intended for ultra-high vacuum application, the exit-snout of the MACHINA transportable proton accelerator beam-line. Metal additive manufacturing components can exhibit heterogeneous and anisotropic microstructures. Two non-destructive imaging techniques, X-ray computed tomography and Neutron Tomography, were employed to examine its microstructure. They unveiled the presence of porosity and channels, the size and composition of grains and intergranular precipitates, and the general behavior of the spatial distribution of the solidification lines. While X-ray computed tomography evidenced qualitative details about the surface roughness and internal defects, neutron tomography showed excellent ability in imaging the spatial density distribution within the component. The anisotropy of the density was attributed to the material building orientation during the 3D printing process. Density variations suggest the possibility of defect pathways, which could affect high vacuum performances. In addition, these results highlight the importance of considering building orientation in the design for additive manufacturing for UHV applications.
Graphical Abstract
中文翻译:
鉴于真空/超高压应用,基于多技术层析成像技术的增材制造组件的非侵入式表征:初步结果
在本文中,我们研究了用于超高真空应用的增材制造的金属部件,即MACHINA可运输质子加速器束线的出口。金属增材制造部件可表现出异质和各向异性的微观结构。两种非破坏性成像技术分别是X射线计算机断层扫描和中子断层扫描,以检查其微观结构。他们揭示了孔隙和通道的存在,晶粒和晶间沉淀物的大小和组成以及凝固线空间分布的一般行为。尽管X射线计算机断层扫描证明了有关表面粗糙度和内部缺陷的定性细节,但中子断层扫描显示了对部件内空间密度分布成像的出色能力。密度的各向异性归因于3D打印过程中的材料构造方向。密度变化表明存在缺陷路径的可能性,这可能会影响高真空性能。此外,这些结果突出了在特高压应用的增材制造设计中考虑建筑物方向的重要性。