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Fatigue behavior of biomedical Co-Cr-Mo-W alloy fabricated by selective laser melting

机译：选择性激光熔化制造生物医学CO-CR-MO-W合金的疲劳行为

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摘要

Co-Cr-Mo based alloy was widely used biomaterials for metallic implants fields. Recently, selective lase melting (SLM), one of the additive manufacturing technologies, is broadly studied because it can produce metallic implants with complex geometries and high degree of personalization. However, the possibility of mechanical failure must be avoided during the working period of SLM produced biomaterials. Therefore, in this paper we investigated the fatigue behaviors of the SLM Co-Cr-Mo-W alloy and their corresponding microstructure and fracture morphology. The sand mold casting fabricated (Cast) Co-Cr-Mo-W alloys with the same chemical composition as SLM specimens were also investigated and compared. The results showed that the SLM Co-Cr-Mo-W alloy exhibits higher fatigue life, tensile strength, and ductility than Cast Co-Cr-Mo-W alloy. The high fraction of ∑3 boundaries and precipitates in SLM Co-Cr-Mo-W alloy lead to secondary cracks and deflected fatigue crack path, which can alleviate the stress concentrations of the main fatigue cracks and decrease the fatigue crack growth rate. However, the dendritic structure of Cast Co-Cr-Mo-W alloy cause cleavage fracture mode and the large island-like precipitates can generate stress concentration, which result in lower fatigue life. We believed that the results of this work can provide a new perspective towards microstructure regulation for additive manufacturing technology and paved way for in-depth application of SLM fabricated biomedical alloy.
机译：基于CO-CR-MO合金是广泛使用的金属植入物领域的生物材料。最近，选择性液体熔化（SLM）是广泛研究的，是一种添加剂制造技术，因为它可以产生具有复杂几何形状和高性性的金属植入物。然而，在SLM产生的生物材料的工作期间，必须避免机械故障的可能性。因此，在本文中，我们研究了SLM CO-CR-MO-W合金的疲劳行为及其相应的微观结构和裂缝形态。还研究了砂模铸造（铸造）CO-CR-MO-W作为SLM标本相同的化学成分的CO-CR-MO-W合金。结果表明，SLM CO-CR-MO-W合金具有比铸造CO-CR-MO-W合金更高的疲劳寿命，拉伸强度和延展性。在SLM CO-CR-MO-W合金中的σ3边界的高分数和沉淀物导致二次裂缝和偏转的疲劳裂纹路径，这可以缓解主要疲劳裂缝的应力浓度并降低疲劳裂纹生长速率。然而，铸造CO-CR-MO-W合金的树突结构导致切割裂缝模式和大岛样沉淀物可以产生应力浓度，从而导致疲劳寿命较低。我们认为这项工作的结果可以为增材制造技术的微观结构调节提供新的视角，并铺设了SLM制造的生物医学合金的深入应用。

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  • 来源
    《Materials Science and Engineering》 |2020年第23期|140000.1-140000.9|共9页
  • 作者

    Xin Dong; Yanan Zhou; Qi Sun; Yuntao Qu; Haojiang Shi; Wenbo Liu; Huabei Peng; Biao Zhang; Sheng Xu; Jiazhen Yan; Ning Li;

  • 作者单位

    School of Mechanical Engineering Sichuan University Chengdu 610065 China;

    School of Mechanical Engineering Sichuan University Chengdu 610065 China;

    School of Mechanical Engineering Sichuan University Chengdu 610065 China;

    School of Mechanical Engineering Sichuan University Chengdu 610065 China;

    School of Mechanical Engineering Sichuan University Chengdu 610065 China;

    School of Mechanical Engineering Sichuan University Chengdu 610065 China;

    School of Mechanical Engineering Sichuan University Chengdu 610065 China;

    Chengdu Keningda Materials Co. Chengdu 610065 China;

    College of Stomatology Guangxi Medical University Nanning 532201 China;

    School of Mechanical Engineering Sichuan University Chengdu 610065 China;

    School of Mechanical Engineering Sichuan University Chengdu 610065 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Co-Cr-Mo-W alloy; Selective laser melting; Fatigue behavior; Biomedical metals;

    机译：CO-CR-MO-W合金;选择性激光熔化;疲劳行为;生物医学金属;

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