The role of microstructure and local crystallographic orientation near porosity defects on the high cycle fatigue life of an additive manufactured Ti-6Al-4V

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Shamir, Muhammad and Syed, Abdul Khadar and Janik, Vit and Biswal, Romali and Zhang, Xiang (2020) The role of microstructure and local crystallographic orientation near porosity defects on the high cycle fatigue life of an additive manufactured Ti-6Al-4V. Materials Characterization, 169. 110576. ISSN 1044-5803 (https://doi.org/10.1016/j.matchar.2020.110576)

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Abstract

Titanium alloys such as Ti-6Al-4V built by most of the additive manufacturing processes are known to contain process induced defects, non-conventional microstructure and strong crystallographic texture; all of which can affect the fatigue strength. In this study we evaluated the effect of crystallographic orientation of α and α lath width around gas pore defects on the high cycle fatigue life of Wire + Arc Additive Manufactured Ti-6Al-4V by means of Electron Back Scattered Diffraction. Here we show that variations in crystallographic orientation of α lath and its width in the vicinity of the crack initiating defect were the main reasons for the considerable scatter in fatigue life. Pyramidal slip systems with high Schmid factor active around the defects resulted in longer fatigue life compared to pyramidal slip with lower Schmid factor. In the absence of pyramidal slip, cracks initiated from active prismatic slip systems. When considering the influence of the microstructure, a higher number of smaller α laths around the defect resulted in longer fatigue life, and vice versa. Overall, the fatigue crack initiation stage was controlled collectively by the complex interaction of porosity characteristics, α lath width and its crystallographic orientation at the crack initiation location.

  • Item type:Article
    ID code:82304
    Dates:
    Date
    Event
    30 November 2020
    Published
    21 August 2020
    Published Online
    14 August 2020
    Accepted
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    Subjects:Technology > Chemical engineering
    Technology > Engineering (General). Civil engineering (General)
    Department:Faculty of Engineering > Naval Architecture, Ocean & Marine Engineering
    Depositing user: Pure Administrator
    Date deposited:12 Sep 2022 11:03
    Last modified:12 Dec 2024 21:43
    URI:https://strathprints.strath.ac.uk/id/eprint/82304
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