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Fatigue behavior of an Fe48Cr15Mo14Er2C15B6 amorphous steel

Published online by Cambridge University Press:  03 March 2011

D.C. Qiao
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996-0100
G.Y. Wang
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996-0100
P.K. Liaw*
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996-0100
V. Ponnambalam
Affiliation:
Department of Physics, University of Virginia, Charlottesville, Virginia 22904-4714
S.J. Poon
Affiliation:
Department of Physics, University of Virginia, Charlottesville, Virginia 22904-4714
G.J. Shiflet
Affiliation:
Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904-4745
*
a) Address all correspondence to this author. e-mail: [email protected]
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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.max.min. 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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Articles
Copyright
Copyright © Materials Research Society 2007

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