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Fatigue behavior of an Fe48Cr15Mo14Er2C15B6 amorphous steel

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Abstract

Four-point-bend fatigue experiments were conducted on the Fe48Cr15Mo14Er2C15B6 bulk metallic glass (BMG), amorphous steel, under load control, employing an electrohydraulic machine, at a frequency of 10 Hz (using a sinusoidal waveform) with an R ratio of 0.1, where R = σmin./σmax. (σmin. and σmax. are the applied minimum and maximum stresses, respectively). The test environment was laboratory air. Fe48Cr15Mo14Er2C15B6 exhibited a high fatigue-endurance limit (682 MPa), which is found to be greater than those of the Zr-based BMG, Al-alloy, and high-nitrogen steel. However, the stress versus number of fatigue cycles curve of Fe48Cr15Mo14Er2C15B6 has a significantly brittle fracture mode. Some fatigue cracks initiated from the inclusions or porosities, and the fatigue-crack propagation region was large. However, other cracks initiated from the outer tensile surface of the specimen, and the fatigue-crack propagation region was very small. The mechanisms of fatigue-crack initiation are suggested.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee, 37996-0100, USA

    D. C. Qiao, G. Y. Wang & P. K. Liaw

  2. Department of Physics, University of Virginia, Charlottesville, Virginia, 22904-4714, USA

    V. Ponnambalam & S. J. Poon

  3. Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia, 22904-4745, USA

    G. J. Shiflet

Authors
  1. D. C. Qiao
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  2. G. Y. Wang
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  3. P. K. Liaw
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  4. V. Ponnambalam
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  5. S. J. Poon
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  6. G. J. Shiflet
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Correspondence to P. K. Liaw.

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Qiao, D.C., Wang, G.Y., Liaw, P.K. et al. Fatigue behavior of an Fe48Cr15Mo14Er2C15B6 amorphous steel. Journal of Materials Research 22, 544–550 (2007). https://doi.org/10.1557/jmr.2007.0047

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