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On the Cyclic Stability and Fatigue Performance of Ultrafine-Grained Interstitial-Free Steel under Mean Stress

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Abstract:

This paper reports on the fatigue performance of an ultrafine-grained (UFG) interstitialfree (IF) steel deformed at various mean stress levels. The UFG microstructure was achieved using equal channel angular extrusion processing at room temperature (RT) and along an “efficient” route, giving way to the formation of high angle grain boundaries (HAGBs) with a high volume fraction. The current study not only confirms the previous finding that a high volume fraction of HAGBs promotes cyclic stability, but also inquires into the role of mean stress level on the cyclic stability. It is shown that the UFG IF steel exhibits a stable cyclic deformation response in the lowcycle fatigue regime within the medium applied mean stress range of -75 to 75 MPa. The corresponding fatigue lives can still be predicted with the Smith-Watson-Topper approach within this range. Furthermore, the present study demonstrates that the evolution of mean strains with cyclic deformation can be linked to the evolution of mean stresses in strain-controlled loading.

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Periodical:

Key Engineering Materials (Volumes 378-379)

Pages:

39-52

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.378-379.39

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Online since:

March 2008

Authors:

Thomas Niendorf, Hans J. Maier, Demircan Canadinc, Ibrahim Karaman

Keywords:

Cyclic Stress-Strain Response, Equal Channel Angular Extrusion (ECAE), Fatigue Life, Interstitial Free Steel, Mean Stress, Ultrafine Grained Material

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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