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首页> 外文期刊>Materials Science and Engineering >Analysis and modelling of tensile and torsional behaviour at different strain rates of Ti6Al4V alloy additive manufactured by electron beam melting (EBM)
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Analysis and modelling of tensile and torsional behaviour at different strain rates of Ti6Al4V alloy additive manufactured by electron beam melting (EBM)

机译：通过电子束熔化（EBM）制造不同应变率的拉伸和扭转行为的分析与建模

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摘要

Additive manufactured Ti6Al4V alloy has become a widely used metallic material in many structural applications including aerospace components and medical implants, where its balance of mechanical performance and flexibility in assuming complex shapes is very appreciated. As a consequence, extensive efforts have been directed towards its mechanical characterization and extended data collections are reported in the literature. However, in the basic characterization, some prominent aspects related to "true" stress-strain behaviour and strain rate effects appear to have been substantially neglected. In this work the tensile behaviour of a Ti6Al4V alloy produced by Electron Beam Melting is investigated at static and dynamic rates together with the torsion response at static rates, in order to evaluate the effects of the strain rate and the Lode stress-state parameter on the elastoplastic response and the fracture initiation. The experimental procedure adopted here relied on enhanced true stress-true strain measurements based on optical measurements of the necking cross section of the specimen, continuously acquired by video recordings, as an alternative to the traditional elongation-based approach to the true stress-true strain evaluation. In the case of static torsion tests, the Nadai method has been used, delivering the equivalent stress-strain curves directly from the torque-rotation experimental data. Moreover, the real stress amplification due to high strain rates has been obtained subtracting the thermal softening effect from the flow curves of the dynamic tests. In addition to the mechanical characterization, micro-graphic analyses allowed to relate the microstructural properties to the additive process conditions and the fracture morphology to the various test conditions imposed to different specimens. Finally the stress-strain results from experiments are compared with literature data for Ti6Al4V alloy, manufactured by the same or different production processes, evidencing how not only manufacturing technique and process conditions, but also the approach used in the characterization affects the results of material behaviour assessment.
机译：添加剂制造的Ti6Al4V合金已成为许多结构应用中的广泛使用的金属材料，包括航空航天部件和医疗植入物，在这种情况下，它的机械性能平衡非常欣赏。因此，广泛的努力朝着其机械表征和延长的数据收集，在文献中报告。然而，在基本表征中，与“真实”应力 - 应变行为和应变率效应相关的一些突出方面似乎基本上被忽略了。在这项工作中，通过电子束熔化产生的Ti6Al4V合金的拉伸行为以静态和动态率和静态速率的扭转响应一起研究，以评估应变速率和盖子应力 - 状态参数的影响弹塑性反应和骨折开始。这里采用的实验程序依赖于基于试样的颈颈截面的光学测量的增强的真实应力 - 真菌测量，以通过视频录制连续获得，作为传统的基于伸长率的方法对真正的应力 - 真菌的替代方法评估。在静态扭转测试的情况下，已经使用了NADAI方法，直接从扭矩旋转实验数据输送等效应力 - 应变曲线。此外，已经获得了高应变率引起的实际应力放大从动态测试的流动曲线减去了热软化效果。除了机械表征之外，允许微图分析与添加剂处理条件的微观结构特性和施加不同标本施加的各种试验条件的微观图形分析。最后，将实验的应力 - 应变结果与Ti6Al4V合金的文献数据进行比较，通过相同或不同的生产过程制造，证明了制造技术和工艺条件的方式，但表征中使用的方法影响了材料行为的结果评估。

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  • 来源
    《Materials Science and Engineering》 |2020年第19期|139916.1-139916.13|共13页
  • 作者

    Giuseppe Mirone; Raffaele Barbagallo; Fabio Giudice; Simone Di Bella;

  • 作者单位

    University of Catania DICAR - Department of Civil Engineering and Architecture Via Santa Sofia 64 95125 Catania CT Italy;

    University of Catania DICAR - Department of Civil Engineering and Architecture Via Santa Sofia 64 95125 Catania CT Italy;

    University of Catania DICAR - Department of Civil Engineering and Architecture Via Santa Sofia 64 95125 Catania CT Italy;

    University of Catania DICAR - Department of Civil Engineering and Architecture Via Santa Sofia 64 95125 Catania CT Italy MT Ortho Srl Via Fossa Lupo Sn 95025 Aci Sant Antonio CT Italy;

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  • 正文语种 eng
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  • 关键词

    Titanium alloy; True curve; High strain rate; Split hopkinson tensile bar (SHTB); Nadai method; Lode angle;

    机译：钛合金;真正的曲线;高应变率;拆分霍普金森拉伸棒（SHTB）;nadai方法;歌角;

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