Effects of Laser Energy Density on Carbon-Nanotube-Reinforced Titanium Composites Printed via Selective Laser Melting,Advanced Engineering Materials

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Effects of Laser Energy Density on Carbon-Nanotube-Reinforced Titanium Composites Printed via Selective Laser Melting
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2021-08-18 , DOI: 10.1002/adem.202100737
Anthony DeMartino ₁ , Troy Y. Ansell ₁ , Andy Nieto ₁

Affiliation

3D-printing-reinforced metal matrix composites are a promising avenue for fabricating materials to meet the demands of the 21st century. Ti–6Al–4 V has been a useful material in the aerospace and medical industries for decades due to its incredible strength-to-weight ratio, and now its suitability for additive manufacturing has made it even more desirable. One of the leading-edge reinforcements being studied for metal matrix composites is carbon nanotubes due to their remarkable mechanical properties such as strength and elastic modulus. It is desirable to manufacture advanced metal matrix composites using advanced manufacturing techniques such as selective laser melting. Herein, the effect of 1 vol% carbon nanotube reinforcements on the microstructural evolution and properties of selective-laser-melt-printed Ti64 and the interrelationships with laser energy density, laser power, and laser scan speed are investigated. The effectiveness of reinforcement and influence of printing parameters are assessed via microstructural and porosity analysis, and microhardness testing. Utilizing selective laser melting with a laser energy density of 60 J mm⁻³, a >99% dense Ti–CNT composite is manufactured with microhardness of 4.75 GPa—a 30% enhancement over its Ti64 counterpart.

中文翻译：

激光能量密度对选择性激光熔化打印碳纳米管增强钛复合材料的影响

3D 打印增强金属基复合材料是制造满足 21 世纪需求的材料的有前途的途径。几十年来，Ti-6Al-4 V 一直是航空航天和医疗行业的有用材料，因为它具有令人难以置信的强度重量比，现在它对增材制造的适用性使其更加受欢迎。正在研究的用于金属基复合材料的前沿增强材料之一是碳纳米管，因为它们具有出色的机械性能，例如强度和弹性模量。希望使用先进的制造技术（例如选择性激光熔化）制造先进的金属基复合材料。在此处，研究了 1 vol% 碳纳米管增强材料对选择性激光熔融打印 Ti64 的微观结构演变和性能的影响，以及与激光能量密度、激光功率和激光扫描速度的相互关系。通过显微结构和孔隙率分析以及显微硬度测试来评估增强效果和打印参数的影响。利用激光能量密度为 60 J mm 的选择性激光熔化^-3，一种 >99% 致密的 Ti-CNT 复合材料被制造出来，其显微硬度为 4.75 GPa，比 Ti64 对应物提高了 30%。

更新日期：2021-08-18

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