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Fatigue of Austempered Ductile Iron with Two Strength Grades in Very High Cycle Regime

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Abstract

In this study, Austempered ductile irons (ADIs) with two different strength grades were produced and the fatigue properties were measured at 109 cycles. The results show that the S-N curves give a typical step-wise shape and there is no fatigue limit in the very high cycle fatigue regime. The two grades ADI have the similar fracture behaviors and fatigue failure can initiate from defects at specimen surface and subsurface zone. On the fracture surfaces of some specimens, the ‘granular-bright-facet’ area with rich carbon distribution is observed in the vicinity of the defect. The microstructure affects the crack behaviors at the early propagation stage. The ADI with upper and lower bainite shows higher fatigue strength compared with the ADI with coarse upper bainite.

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Acknowledgment

This work was supported by the National Natural Science Foundation of China (No. 51305363), the China Postdoctoral Science Foundation (2015M570795) and State Key Laboratory Independent Research of China (No. 2015TPL_T11).

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Authors and Affiliations

  1. State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, 610031, China

    Jiwang Zhang, Wei Li, Qingpeng Song, Ning Zhang & Liantao Lu

  2. CSR Qishuyan Institute Co. Ltd., Changzhou, 213000, China

    Jiwang Zhang

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  1. Jiwang Zhang
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  2. Wei Li
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Correspondence to Jiwang Zhang.

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Zhang, J., Li, W., Song, Q. et al. Fatigue of Austempered Ductile Iron with Two Strength Grades in Very High Cycle Regime. J. of Materi Eng and Perform 25, 744–749 (2016). https://doi.org/10.1007/s11665-016-1894-x

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  • DOI: https://doi.org/10.1007/s11665-016-1894-x

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