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Study of pore defect and mechanical properties in selective laser melted Ti6A14V alloy based on X-ray computed tomography

机译：基于X射线计算断层扫描的选择性激光熔化Ti6a14V合金中孔隙缺损和力学性能研究

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摘要

The selective laser melting (SLM) technology is widely used for the manufacturing of Ti6A14V alloy components in the biomedical and aerospace industries, and the residual pores are one of the significant defects obstructing its further application. X-ray computed tomography (XCT) technique was applied for the examination and analysis of the spatial and morphological features of pore defects, which will influence the tensile properties of the SLM-manufactured Ti6A14V samples. Hence, the effects of processing parameters on pore defects and their formation mechanism are discussed thoroughly. The results showed that two major types of pore defects are observed: the lack-of-fusion caused by low volumetric energy density (VED), and the keyhole mode resulting from excessive energy densities. The highest relative density of 99.995% was obtained at a VED value of 58.8 J/ mm3. Besides, the quantitative information of the porosity defects, such as size distribution, morphology and formation direction, was evaluated using XCT to reveal their formation mechanisms. Furthermore, the tensile properties of SLM-manufactured Ti6A14V alloy under different VED values were evaluated to correlate with the porosity variation. Overall, the tensile strength and ductility were notably degraded with the increase of porosity. The fractography study based on XCT and SEM showed that lack-of-fusion and porosities are responsible for the early fracture. In conclusion, the XCT technique can provide direct and precise inspection of the process of laser-based additive manufacturing to control the overall quality.
机译：选择性激光熔化（SLM）技术广泛用于生物医学和航空航天工业中的Ti6a14V合金成分，残留孔隙是阻碍其进一步应用的重要缺陷之一。应用X射线计算机断层扫描（XCT）技术用于孔隙缺损的空间和形态特征的检查和分析，这将影响SLM制造的Ti6a14V样品的拉伸性能。因此，彻底讨论了处理参数对孔隙缺陷及其形成机制的影响。结果表明，观察到两种主要类型的孔隙缺损：由低容量能量密度（VEE）和由过度的能量密度引起的钥匙孔模式引起的融合缺乏。在58.8J / mm3的VEE值获得99.995％的最高相对密度。此外，使用XCT评估孔隙缺陷的定量信息，例如尺寸分布，形态和形成方向，以显示它们的形成机制。此外，评价在不同VEE值下的SLM制造的Ti6a14V合金的拉伸性能与孔隙率变化相关。总的来说，随着孔隙率的增加，拉伸强度和延展性显着降解。基于XCT和SEM的Fractography研究表明，融合融合和孔隙症负责早期骨折。总之，XCT技术可以直接和精确地检查激光的添加剂制造过程，以控制整体质量。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|139981.1-139981.15|共15页
  • 作者

    Wei Liu; Chaoyue Chen; Sansan Shuai; Ruixin Zhao; Longtao Liu; Xiaodong Wang; Tao Hu; Weidong Xuan; Chuanjun Li; Jianbo Yu; Jiang Wang; Zhongming Ren;

  • 作者单位

    State Key Laboratory of Advanced Special Steels School of Materials Science and Engineering Shanghai University Shanghai 200444 China;

    State Key Laboratory of Advanced Special Steels School of Materials Science and Engineering Shanghai University Shanghai 200444 China;

    State Key Laboratory of Advanced Special Steels School of Materials Science and Engineering Shanghai University Shanghai 200444 China;

    State Key Laboratory of Advanced Special Steels School of Materials Science and Engineering Shanghai University Shanghai 200444 China;

    State Key Laboratory of Advanced Special Steels School of Materials Science and Engineering Shanghai University Shanghai 200444 China;

    State Key Laboratory of Advanced Special Steels School of Materials Science and Engineering Shanghai University Shanghai 200444 China;

    State Key Laboratory of Advanced Special Steels School of Materials Science and Engineering Shanghai University Shanghai 200444 China;

    State Key Laboratory of Advanced Special Steels School of Materials Science and Engineering Shanghai University Shanghai 200444 China;

    State Key Laboratory of Advanced Special Steels School of Materials Science and Engineering Shanghai University Shanghai 200444 China;

    State Key Laboratory of Advanced Special Steels School of Materials Science and Engineering Shanghai University Shanghai 200444 China;

    State Key Laboratory of Advanced Special Steels School of Materials Science and Engineering Shanghai University Shanghai 200444 China;

    State Key Laboratory of Advanced Special Steels School of Materials Science and Engineering Shanghai University Shanghai 200444 China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Selective laser melting; Ti6A14V; Pore defects; X-ray computed tomography (XCT); Mechanical properties;

    机译：选择性激光熔化;Ti6a14v;毛孔缺陷;X射线计算断层扫描（XCT）;机械性能;

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