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Influence of stepped austempering process on the fracture toughness of austempered ductile iron

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Abstract

This research studied the effect of a two-step austempering process on the fracture toughness of ductile iron and compared it to that of the conventional upper- and lower-ausferrite austempered ductile irons (ADIs). The results showed that such a two-step austempering heat-treatment process yielded a fracture-toughness value equivalent to that of the upper-ausferrite ADI, while the hardness was maintained at the level of lower-ausferrite ADI. This provided a unique combination of high toughness with good hardness (strength) properties for the ADI with a two-step austempering. Optical microscopy, scanning electron microscopy (SEM), and X-ray diffraction analysis were performed to correlate the properties attained to the microstructural features.

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Authors and Affiliations

  1. the Department of Materials Engineering, Tatung University, 10451, Taipei, Taiwan, Republic of China

    Cheng-Hsun Hsu (Professor) & Tao-Liang Chuang (Graduate Student)

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  1. Cheng-Hsun Hsu
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  2. Tao-Liang Chuang
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Hsu, CH., Chuang, TL. Influence of stepped austempering process on the fracture toughness of austempered ductile iron. Metall Mater Trans A 32, 2509–2514 (2001). https://doi.org/10.1007/s11661-001-0040-y

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  • DOI: https://doi.org/10.1007/s11661-001-0040-y

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