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Influence of austenitising temperature on the formation of strain induced martensite in austempered ductile iron

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Abstract

The present work was taken up to study the influence of austenitising temperature on the formation of strain-induced martensite in austempered ductile iron. Ductile iron containing 1.5 wt.% nickel, 0.3 wt.% molybdenum and 0.5 wt.% copper was subjected to austempering treatments which consisted of three austenitising temperatures, namely 850, 900 and 950 °C, and three austempering temperatures, namely 300, 350 and 400 °C. Tensile tests were carried out under all the heat-treatment conditions and strain-hardening behaviour was studied by applying Hollomon equation. Microstructures were studied by optical microscopy and X-ray diffraction. It was found that increasing austenitising temperature increased the tendency for the formation of strain-induced martensite at all the austempering temperatures.

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Acknowledgement

This work was financially supported by the Council of Scientific and Industrial Research, New Delhi, India.

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  1. Department of Metallurgical and Materials Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore, 575025, Karnataka, India

    Srinivasmurthy Daber, K. S. Ravishankar & P. Prasad Rao

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  1. Srinivasmurthy Daber
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  2. K. S. Ravishankar
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  3. P. Prasad Rao
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Correspondence to P. Prasad Rao.

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Daber, S., Ravishankar, K.S. & Prasad Rao, P. Influence of austenitising temperature on the formation of strain induced martensite in austempered ductile iron. J Mater Sci 43, 4929–4937 (2008). https://doi.org/10.1007/s10853-008-2717-8

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