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Unnotched Charpy Impact Energy Transition Behavior of Austempered Engineering Grade Ductile Iron Castings

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Abstract

Unnotched Charpy impact energy transition behavior of five different engineering grade ductile iron castings, as specified by EN 1563 Standards, were examined in as-cast, as well as in austempered states. ADIs were produced with the maximum impact energy values permissible for the grades. Austempering treatment detrimented the sub-zero impact properties of the ferritic castings, but considerably enhanced those of the pearlitic–ferritic irons. The impact energy transition behavior of the austempered states of all the grades examined were noted to be determined by the progressive transformation of the unavoidable carbon-unsaturated and untransformed regions of the austenite remaining in the matrix of the austempered ductile iron to martensite with decreasing temperature.

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Acknowledgment

The authors are indebted to Döktaş A.Ş. (now, Componenta) for their invaluable assistance in producing the d.i. castings and providing the chemical and microstructural data pertinent to the as-cast states of the castings.

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Authors and Affiliations

  1. Faculty of Engineering, Istanbul University, Istanbul, Turkey

    Sukru Ergin Kisakurek (Professor)

  2. Faculty of Engineering, Sakarya University, Sakarya, Turkey

    Ahmet Ozel (Associate Professor)

Authors
  1. Sukru Ergin Kisakurek
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  2. Ahmet Ozel
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Correspondence to Sukru Ergin Kisakurek.

Additional information

Manuscript submitted February 3, 2013.

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Kisakurek, S.E., Ozel, A. Unnotched Charpy Impact Energy Transition Behavior of Austempered Engineering Grade Ductile Iron Castings. Metall Mater Trans B 45, 454–463 (2014). https://doi.org/10.1007/s11663-013-9976-8

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  • DOI: https://doi.org/10.1007/s11663-013-9976-8

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