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后处理对采用电子束熔炼制备的Ti-5Al-5Mo-5V-1Cr-1Fe疲劳性能的影响

The Effect of Postprocessing on the Fatigue Properties of Ti-5Al-5Mo-5V-1Cr-1Fe Produced Using Electron Beam Melting.

作者信息

Karoluk Michał, Kobiela Karol, Madeja Marcin, Dziedzic Robert, Ziółkowski Grzegorz, Kurzynowski Tomasz

机构信息

Faculty of Mechanical Engineering, Centre for Advanced Manufacturing Technologies (CAMT-FPC), Wroclaw University of Science and Technology, Lukasiewicza 5, 50-371 Wroclaw, Poland.

出版信息

Materials (Basel). 2023 Jan 31;16(3):1201. doi: 10.3390/ma16031201.

DOI:10.3390/ma16031201
PMID:36770209
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9919153/
Abstract

Despite the significant potential advantages of processing Ti-5Al-5Mo-5V-1Cr-1Fe alloy (Ti-55511) using Electron Beam Melting (PBF-EB/M), when compared to conventional manufacturing technologies, the resulting internal defects are an important characteristic of such additive technologies and can highly decrease mechanical properties. One of the most dangerous defects formed during metal additive manufacturing processes are material discontinuities such as a lack of fusion. Defects of this type, due to their "flat" nature, are difficult to characterize. For cycle-loaded specimens, where the loading force acts perpendicular to the lack-of-fusion plane, defects of this type can significantly reduce fatigue properties. This paper presents the results of research aimed at improving the fatigue properties of Ti55511 alloy by reducing the influence of the lack-of-fusion defect on fatigue damage. The static and fatigue properties of specimens in the as-built state, as well as after hot isostatic pressing (HIP) treatment, were analyzed. The effect of HIP on both the reduction of pores and the degree of sphericity when using the X-ray computed tomography (XCT) system was presented. The change in the microstructure after HIP was analyzed in terms of the change in the size of individual phases, as well as the change in the phase ratio. This paper also contains a fractographic analysis of the samples after tensile and fatigue tests.

摘要

尽管与传统制造技术相比，采用电子束熔炼（PBF-EB/M）工艺加工Ti-5Al-5Mo-5V-1Cr-1Fe合金（Ti-55511）具有显著的潜在优势，但由此产生的内部缺陷是此类增材制造技术的一个重要特征，并且会大幅降低机械性能。金属增材制造过程中形成的最危险缺陷之一是材料不连续，例如未熔合。由于这类缺陷具有“扁平”的特性，因此难以对其进行表征。对于循环加载的试样，当加载力垂直于未熔合平面作用时，此类缺陷会显著降低疲劳性能。本文介绍了旨在通过减少未熔合缺陷对疲劳损伤的影响来提高Ti55511合金疲劳性能的研究结果。分析了试样在制造状态以及热等静压（HIP）处理后的静态和疲劳性能。展示了使用X射线计算机断层扫描（XCT）系统时HIP对气孔减少和球化程度的影响。从各个相尺寸的变化以及相比例的变化方面分析了HIP后微观结构的变化。本文还包含了拉伸和疲劳试验后样品的断口分析。

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本文引用的文献

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Materials (Basel). 2022 May 19;15(10):3624. doi: 10.3390/ma15103624.
2
The Effect of EBM Process Parameters on Porosity and Microstructure of Ti-5Al-5Mo-5V-1Cr-1Fe Alloy.电子束熔炼工艺参数对Ti-5Al-5Mo-5V-1Cr-1Fe合金气孔率和微观结构的影响
Scanning. 2019 Apr 1;2019:2903920. doi: 10.1155/2019/2903920. eCollection 2019.