MulTi-FAST: A Machinability Assessment of Functionally Graded Titanium Billets Produced from Multiple Alloy Powders.
MulTi-FAST: A Machinability Assessment of Functionally Graded Titanium Billets Produced from Multiple Alloy Powders.
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DOI：
10.3390/ma15093237
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发表时间：
2022-04-30
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影响因子：
--
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功能梯度多材料制造领域的技术发展有望颠覆航空航天工业，通过量身定制的组件设计提供性能逐步改善的手段。然而，在下游加工过程中面临的挑战，即，这种功能梯度多材料的加工还不清楚。在这项研究中，面临的挑战时，车削钢坯组成的多种合金进行了评估。为了实现这一目标，使用场辅助烧结技术（FAST）从粉末原料制造了由Ti-64、Ti-6242、Ti-5553和Beta C合金组成的圆柱形坯料，称为MulTi-FAST坯料。对MulTi-FAST坯料中多个钛合金结合对的扩散结合界面在加工过程中的结构完整性进行了详细研究。在端面车削过程中测量加工力，以研究在连续加工操作过程中不同合金对的影响和行为。结果表明，钛合金梯度副的力加工响应、表面形貌和表面损伤类型的显著差异取决于钛合金梯度副的加工方向。在亚表面微观结构损伤方面，无论加工方向如何，在粘结合金附近没有发现临界损伤。研究结果提供了一个洞察变形特性和面临的挑战，在加工功能梯度组件与多种钛合金。
Technological developments in the area of functionally graded multi-material manufacture are poised to disrupt the aerospace industry, providing the means for step-change improvements in performance through tailored component design. However, the challenges faced during the downstream processing, i.e., machining of such functionally graded multi-materials are unclear. In this study, the challenges involved when face-turning billets consisting of multiple alloys are assessed. To achieve this, a cylindrical billet consisting of Ti-64, Ti-6242, Ti-5553 and Beta C alloys was manufactured from powder feedstock using field-assisted sintering technique (FAST) and termed MulTi-FAST billets. A detailed study of the structural integrity during machining at the diffusion bond interfaces of multiple titanium alloy bond pairings in the MulTi-FAST billet was conducted. The machining forces were measured during face-turning to investigate the impact and behaviour of different alloy pairings during a continuous machining operation. The results showed the significant differences in force machining response, surface topography and the type of surface damage was dependent on the direction the titanium alloy graded pairings were machined in. In terms of subsurface microstructural damage, regardless of the machining direction, no critical damage was found in the vicinity of the bonded alloys. The findings provide an insight into the deformation characteristics and challenges faced in the machining of functionally graded components with multiple titanium alloys.
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