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Fatigue crack nucleation and growth behaviors of laser melting deposited Ti-6Al-2Zr-Mo-V

机译：激光熔化沉积Ti-6Al-2Zr-Mo-V的疲劳裂纹形核和生长行为

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摘要

The fatigue crack nucleation and growth behaviors of laser melting deposited (LMD) Ti-6Al-2Zr-Mo-V alloy are studied. A fine α/β lamellar microstructure is obtained. High-cycle fatigue test was conducted at room temperature. Fatigue fracture surfaces are examined by SEM. Fatigue crack initiates by cleavage fracture along crystallographic facets in α and propagates by cleavage facets and tearing of α/β lamellar colonies in fatigue crack initiation region. At applied stress less than 750 MPa, fatigue crack nucleation is characterized by the crystallographic cleavage facets of α lamellae and tearing of β lamellae. Striations are observed parallel or perpendicular to the lamellar orientation. Two types of steps are observed in the crack propagation. The mechanisms of fatigue nucleation and growth in laser deposited Ti-6Al-2Zr-Mo-V alloy are related to the slip behaviors and the interactions between crack and colony boundaries.
机译：研究了激光熔敷Ti-6Al-2Zr-Mo-V合金的疲劳裂纹形核和生长行为。获得了良好的α/β层状微结构。高循环疲劳试验在室温下进行。通过SEM检查疲劳断裂面。疲劳裂纹是通过沿α中的晶体小面的劈裂断裂而引发的，并通过断裂小面和疲劳裂纹起始区域中的α/β层状菌落的撕裂而传播。在小于750 MPa的外加应力下，疲劳裂纹成核的特征是α片的晶体断裂面和β片的断裂。观察到平行于或垂直于层状取向的条纹。在裂纹扩展中观察到两种类型的台阶。激光沉积Ti-6Al-2Zr-Mo-V合金的疲劳成核和生长机理与滑动行为以及裂纹与菌落边界之间的相互作用有关。

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  • 来源
    《Materials Science and Engineering》 |2010年第8期|1933-1937|共5页
  • 作者

    R.J. He; H.M. Wang;

  • 作者单位

    Laboratory of Laser Materials Processing and Manufacturing, Beijing University of Aeronautics and Astronautics, 37 XueYuan Road, Beijing 100083, PR China;

    Laboratory of Laser Materials Processing and Manufacturing, Beijing University of Aeronautics and Astronautics, 37 XueYuan Road, Beijing 100083, PR China Key Laboratory of Aerospace Materials, Ministry of Education of China, Beijing University of Aeronautics and Astronautics, 37 XueYuan Road, Beijing 100083, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    titanium; fatigue; crack nucleation; crack propagation; laser melting deposition; microstructure;

    机译：钛;疲劳;裂纹形核裂纹扩展激光熔化沉积;微观结构;

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