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Effect of Microstructural Banding on the Fatigue Behavior of Induction-Hardened 4140 Steel

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Abstract

The fatigue behavior of induction-hardened calcium-treated 4140 steel with three different case depths was evaluated using rotating bending fatigue tests. The as-received microstructure of the steel was banded and the orientation of microstructural banding with respect to the fatigue specimen was varied. Due to the inclusion shape control resulting from the calcium additions, inclusions in the steel were not elongated in the direction of the banding. It was found that microstructure banding does not have a significant influence on the fatigue properties of the steel tested. Furthermore, the fatigue limit increase with case depth is primarily related to the bending stress near the location of crack nucleation.

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The support of the Advanced Steel Processing and Products Research Center at the Colorado School of Mines is gratefully acknowledged.

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Correspondence to K. O. Findley.

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Manuscript submitted November 13, 2012.

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Hayne, M.L., Anderson, P.I., Findley, K.O. et al. Effect of Microstructural Banding on the Fatigue Behavior of Induction-Hardened 4140 Steel. Metall Mater Trans A 44, 3428–3433 (2013). https://doi.org/10.1007/s11661-013-1774-z

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