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The influence of process parameters on corrosion behavior of Ti6Al4V alloy processed by selective laser melting
Journal of Laser Applications ( IF 1.7 ) Pub Date : 2020-08-01 , DOI: 10.2351/1.5139499
Chenghui Qian 1 , Hongzhen Xu 1 , Qun Zhong 2
Affiliation  

Ti6Al4V alloy exhibits good biocompatibility and has a wide range of applications in the medical fields. Additive manufacturing, especially selective laser melting (SLM), provides a new and effective way for the fabrication of Ti6Al4V alloy biological components. The corrosion resistance of SLM processed Ti6Al4V alloy needs further investigation, which is important for the application of biological components. In this study, Ti6Al4V alloy was fabricated by SLM using different process parameters. Electrochemical measurements including open circuit potential, potentiodynamic polarization, and electrochemical impedance spectroscopy were performed to study the influence of laser scan speed on the corrosion behavior of SLM fabricated Ti6Al4V specimens. The corrosion resistance on different planes of SLM fabricated Ti6Al4V alloy was further characterized. The electrochemical measurements indicated that the corrosion resistance was reduced as the laser scan speed increased. Microstructure analysis suggested that the inferior corrosion resistance under a high laser scan speed was related to the decreased densification behavior. Compared to the XZ-plane, the XY-plane possesses a superior corrosion resistance. The anisotropic corrosion resistance on XY- and XZ-planes of SLM fabricated Ti6Al4V alloys is attributed to the different microstructures on different planes, where more α′ martensite and less β-Ti phase were formed on the XZ-plane than on the XY-plane.

中文翻译:

工艺参数对激光选区熔化加工Ti6Al4V合金腐蚀行为的影响

Ti6Al4V合金具有良好的生物相容性,在医疗领域有着广泛的应用。增材制造,尤其是选择性激光熔化 (SLM),为 Ti6Al4V 合金生物部件的制造提供了一种新的有效方法。SLM 处理的 Ti6Al4V 合金的耐腐蚀性需要进一步研究,这对生物成分的应用具有重要意义。在这项研究中,使用不同的工艺参数通过 SLM 制造 Ti6Al4V 合金。进行电化学测量,包括开路电位、动电位极化和电化学阻抗谱,以研究激光扫描速度对 SLM 制造的 Ti6Al4V 试样腐蚀行为的影响。进一步表征了 SLM 制造的 Ti6Al4V 合金在不同平面上的耐腐蚀性能。电化学测量表明,随着激光扫描速度的增加,耐腐蚀性降低。微观结构分析表明,在高激光扫描速度下较差的耐腐蚀性与降低的致密化行为有关。与 XZ 平面相比,XY 平面具有优异的耐腐蚀性。SLM 制备的 Ti6Al4V 合金在 XY 和 XZ 平面上的各向异性耐蚀性归因于不同平面上的不同显微组织,其中在 XZ 平面上形成的 α' 马氏体和较少的 β-Ti 相比在 XY 平面上形成. 微观结构分析表明,在高激光扫描速度下较差的耐腐蚀性与降低的致密化行为有关。与 XZ 平面相比,XY 平面具有优异的耐腐蚀性。SLM 制备的 Ti6Al4V 合金在 XY 和 XZ 平面上的各向异性耐蚀性归因于不同平面上的不同显微组织,其中在 XZ 平面上形成的 α' 马氏体和较少的 β-Ti 相比在 XY 平面上形成. 微观结构分析表明,在高激光扫描速度下较差的耐腐蚀性与降低的致密化行为有关。与 XZ 平面相比,XY 平面具有优异的耐腐蚀性。SLM 制备的 Ti6Al4V 合金在 XY 和 XZ 平面上的各向异性耐蚀性归因于不同平面上的不同显微组织,其中在 XZ 平面上形成的 α' 马氏体和较少的 β-Ti 相比在 XY 平面上形成.
更新日期:2020-08-01
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