Atzeni Eleonora, Genna Silvio, Menna Erica, Rubino Gianluca, Salmi Alessandro, Trovalusci Federica
Department of Management and Production Engineering, Politecnico di Torino, Corso Duca Degli Abruzzi 24, 10129 Torino, Italy.
Department of Enterprise Engineering, Università degli Studi di Roma "Tor Vergata", Via del Politecnico 1, 00133 Roma, Italy.
Materials (Basel). 2021 Sep 17;14(18):5366. doi: 10.3390/ma14185366.
Metal additive manufacturing is a major concern for advanced manufacturing industries thanks to its ability to manufacture complex-shaped parts in materials that are difficult to machine using conventional methods. Nowadays, it is increasingly being used in the industrial manufacturing of titanium-alloy components for aerospace and medical industries; however, the main weakness of structural parts is the fatigue life, which is affected by surface quality, meaning the micro-cracking of small surface defects induced by the manufacturing process. Laser finishing and Abrasive Fluidized Bed are proposed by the authors since they represent cost-effective and environment-friendly alternatives for automated surface finishing. A comparison between these two finishing technologies was established and discussed. Experimental tests investigated both mechanical properties and fatigue performances. The tests also focused on understanding the basic mechanisms involved in fatigue failures of machined Ti-6Al-4V components fabricated via Electron Beam Melting and the effects of operational parameters. X-ray tomography was used to evaluate the internal porosity to better explain the fatigue behaviour. The results demonstrated the capability of Laser finishing and Abrasive Fluidized Beds to improve failure performances. Life Cycle Analysis was additionally performed to verify the effectiveness of the proposed technologies in terms of environmental impact and resource consumption.
金属增材制造因其能够使用传统方法难以加工的材料制造复杂形状的零件，而成为先进制造业的主要关注点。如今，它越来越多地用于航空航天和医疗行业钛合金部件的工业制造；然而，结构部件的主要弱点是疲劳寿命，这受到表面质量的影响，即制造过程引起的小表面缺陷的微裂纹。作者提出了激光精加工和磨料流化床，因为它们是自动化表面精加工的经济高效且环保的替代方案。对这两种精加工技术进行了比较并展开讨论。实验测试研究了机械性能和疲劳性能。测试还侧重于了解通过电子束熔炼制造的加工Ti-6Al-4V部件疲劳失效的基本机制以及操作参数的影响。使用X射线断层扫描来评估内部孔隙率，以更好地解释疲劳行为。结果证明了激光精加工和磨料流化床改善失效性能的能力。此外，还进行了生命周期分析，以验证所提出技术在环境影响和资源消耗方面的有效性。
