Effects of highly stressed volume on fatigue strength of austempered ductile irons

Chih Kuang Lin, Wen Jeng Lee

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43 Scopus citations


The relationship between fatigue strength and highly stressed volume was investigated with various combinations of specimen configurations and loading modes for austempered ductile irons (ADIs) in different heat treatments. Fatigue specimens were prepared in different notch geometries with stress concentration factors ranging from 1 to 2.64. High-cycle fatigue experiments were conducted in both rotating-bending and axial loading to determine the relevant stress-life curves. Experimental results indicate that the fatigue strength of ADI is higher when austempered at 360°C in comparison to that austempered at 300°C due to the greater toughness present. The fatigue limit in rotating-bending is higher than that in axial loading because of a smaller volume of high stress. ADI austempered at 300°C is more susceptible to notch effects on fatigue strength due to its harder, more brittle matrix structure. The fatigue limit of ADI is generally decreased with an increase in the volume of material subjected to high stress. A prediction equation for the fatigue limits of ADIs at different heat-treated conditions is established in terms of highly stressed volume and toughness.

Original languageEnglish
Pages (from-to)301-307
Number of pages7
JournalInternational Journal of Fatigue
Issue number4
StatePublished - Apr 1998


  • Austempered ductile iron
  • Fatigue strength
  • Highly stressed volume
  • Loading mode
  • Notch effect


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