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Influence of Casting Section Thickness on Fatigue Strength of Austempered Ductile Iron

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Abstract

The influence of casting section thickness on fatigue strength of austempered ductile iron was investigated in this study. ASTM A536 65-45-12 grade of ductile iron was produced, machined into round samples of 10, 15, 20 and 25 mm diameter, austenitized at a temperature of 820 °C, quenched into an austempering temperature (\(T_{\text{A}}\)) of 300 and 375 °C and allowed to be isothermally transformed at these temperatures for a fixed period of 2 h. From the samples, fatigue test specimens were machined to conform to ASTM E-466. Scanning electron microscopy (SEM) and x-ray diffraction (XRD) methods were used to characterize microstructural morphology and phase distribution of heat-treated samples. The fatigue strength decreases as the section thickness increases. The SEM image and XRD patterns show a matrix of acicular ferrite and carbon-stabilized austenite with ferrite coarsening and volume fraction of austenite reducing as the section thickness increases. The study concluded that the higher the value of carbon-stabilized austenite the higher the fatigue strength while it decreases as the ausferrite structure becomes coarse.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Obafemi Awolowo University, Ile-Ife, Nigeria

    J. O. Olawale & S. A. Ibitoye

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  1. J. O. Olawale
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  2. S. A. Ibitoye
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Correspondence to J. O. Olawale.

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Olawale, J.O., Ibitoye, S.A. Influence of Casting Section Thickness on Fatigue Strength of Austempered Ductile Iron. J. of Materi Eng and Perform 26, 4997–5008 (2017). https://doi.org/10.1007/s11665-017-2964-4

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  • DOI: https://doi.org/10.1007/s11665-017-2964-4

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