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Enhancement of Fatigue Properties of Ductile Irons by Successive Austempering Heat Treatment

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Abstract

The aim of this study is to evaluate the effects of austempering heat treatment on the microstructure, mechanical properties, and bending fatigue behavior of an alloyed ductile iron with chemical composition of 1.6 wt.% Ni, 0.47 wt.% manganese and 0.6 wt.% copper. Based on the results of tensile and impact tests, as well as metallographic studies, optimum heat-treating cycles were determined and applied on the standard fatigue specimens. The results showed that the fatigue strength of specimens austempered successively was practically comparable to those austempered at high temperatures and considerably greater than those austempered at low temperatures.

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Authors and Affiliations

  1. Metallurgy Department, Niroo Research Institute, Tehran, Iran

    M. R. Jahangiri

  2. Department of Metallurgy and Materials Engineering, University of Tehran, Tehran, Iran

    M. Nili Ahmadabadi & H. Farhangi

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  1. M. R. Jahangiri
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  2. M. Nili Ahmadabadi
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  3. H. Farhangi
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Correspondence to M. R. Jahangiri.

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Jahangiri, M.R., Ahmadabadi, M.N. & Farhangi, H. Enhancement of Fatigue Properties of Ductile Irons by Successive Austempering Heat Treatment. J. of Materi Eng and Perform 20, 1642–1647 (2011). https://doi.org/10.1007/s11665-011-9846-y

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  • DOI: https://doi.org/10.1007/s11665-011-9846-y

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