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首页> 外文期刊>Materials Science and Engineering >Compressive fatigue properties of additive-manufactured Ti-6Al-4V cellular material with different porosities
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Compressive fatigue properties of additive-manufactured Ti-6Al-4V cellular material with different porosities

机译：添加剂制造的Ti-6AL-4V细胞材料具有不同孔隙的压缩疲劳性能

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摘要

Selective laser melting (SLM) is a novel additive manufacturing (AM) technique for producing cellular metallic materials with designed pore structures. SLM Ti-6A1-4V cellular alloys have been extensively studied for biomedical and other applications. The objective of this study was to investigate the effects of porosity (33 vol%, 50 vol%, and 84 vol%) on the compressive fatigue performance and fracture mechanism of an SLM Ti-6Al-4V cellular material with a new cuboctahedron COH-Z unit cell. Furthermore, the influences of hot isostatic pressing (HIP) at 1000°C/150 Mpa on the fatigue properties and fracture were also examined in this study. The results showed that the fatigue strain slowly accumulated when the stress cycle was below the 70% fatigue life. After the 70% fatigue life, the ratcheting strain rate (dε/dN) gradually increased. A shear band along a direction inclined at -45° to the stress axis could be definitely identified at about 95% fatigue life, as demonstrated by the digital image correlation technique. With further increases in the stress cycle, the shear band was intensified and finally led to rapid fatigue failure. The HIP process did not alter the fracture behaviors of the SLM cellular alloy, although the fatigue life was much improved by several times. On the other hand, the fatigue endurance ratio of the SLM cellular alloy with 33 vol% was 0.5. Raising the porosity from 33 vol% to 84 vol% reduced the endurance ratio from 0.5 to 0.15 due mainly to the high notch sensitivity of α'-martensite in the SLM cellular alloy. The HIP treatment changed the microstructure from α'-martensite to lamellar α+β phases and thus significantly improved the fatigue endurance performance. With the combination of the COH-Z unit cell and HIP treatment, the endurance ratios at 106 cycles of the Ti-6A1-4V cellular alloy with porosities of 33 vol% to 84 vol% were as high as 0.5. This superior endurance ratio is advantageous to the long-term application of SLM Ti-6Al-4V cellular alloy.
机译：选择性激光熔化（SLM）是一种新型添加剂制造（AM）技术，用于生产具有设计孔结构的细胞金属材料。 SLM TI-6A1-4V蜂窝合金已广泛研究生物医学和其他应用。本研究的目的是探讨孔隙率的影响（33体积％，50体积％和84体积％）与新型幼崽二氧化碳COH-的SLM TI-6AL-4V细胞材料的压缩疲劳性能和断裂机制z单位细胞。此外，还研究了本研究中，在1000℃/ 150MPa对疲劳性能和裂缝进行了热等静压（髋部）的影响。结果表明，当应力循环低于70％疲劳寿命时，疲劳菌株缓慢累积。在70％的疲劳寿命之后，棘轮应变速率（Dε/ DN）逐渐增加。正如数字图像相关技术所证明的那样，沿着-45°倾斜于-45°至应力轴的方向的剪切带可以肯定地识别出约95％的疲劳寿命。随着应力循环的进一步增加，剪切带被加剧，最终导致了快速疲劳失效。髋关节过程没有改变SLM细胞合金的断裂行为，尽管疲劳寿命大大提高了几次。另一方面，33体积％的SLM细胞合金的疲劳耐久性为0.5。将孔隙率从33体积％升至84体积％降低了0.5至0.15的耐久性，主要是SLM细胞合金中α'-马氏体的高缺口敏感性。髋关节处理将α'-martensite的微观结构改变为层状α+β相，因此显着提高了疲劳耐久性性能。随着COH-Z单元电池和髋关节处理的组合，106个循环的渗透率为33体积％至84体积％的Ti-6a1-4V细胞合金的耐久率高达0.5。这种优异的耐久性比对于SLM Ti-6Al-4V细胞合金的长期施用是有利的。

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  • 来源
    《Materials Science and Engineering》 |2020年第jul14期|139695.1-139695.9|共9页
  • 作者

    Ming-Wei Wu; Jhewn-Kuang Chen; BoHuan Lin; Po-Hsing Chiang; Mo-Kai Tsai;

  • 作者单位

    Department of Materials and Mineral Resources Engineering National Taipei University of Technology No. 1 Sec. 3 Zhong-Xiao E. Rd Taipei 10608 Taiwan;

    Department of Materials and Mineral Resources Engineering National Taipei University of Technology No. 1 Sec. 3 Zhong-Xiao E. Rd Taipei 10608 Taiwan;

    Department of Materials and Mineral Resources Engineering National Taipei University of Technology No. 1 Sec. 3 Zhong-Xiao E. Rd Taipei 10608 Taiwan;

    Department of Materials and Mineral Resources Engineering National Taipei University of Technology No. 1 Sec. 3 Zhong-Xiao E. Rd Taipei 10608 Taiwan;

    Department of Materials and Mineral Resources Engineering National Taipei University of Technology No. 1 Sec. 3 Zhong-Xiao E. Rd Taipei 10608 Taiwan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Selective laser melting; Ti-6Al-4V; Cellular material; Hot isostatic pressing; Fatigue; Fracture;

    机译：选择性激光熔化;TI-6AL-4V;细胞材料;热性等静压;疲劳;断裂;

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