Journal of Materials Science

, Volume 43, Issue 14, pp 4929–4937 | Cite as

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

  • Srinivasmurthy Daber
  • K. S. Ravishankar
  • P. Prasad Rao


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.


Ferrite Austenite Martensite Ductile Iron Austempering 
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This work was financially supported by the Council of Scientific and Industrial Research, New Delhi, India.


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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Srinivasmurthy Daber
    • 1
  • K. S. Ravishankar
    • 1
  • P. Prasad Rao
    • 1
  1. 1.Department of Metallurgical and Materials EngineeringNational Institute of Technology KarnatakaSurathkal, MangaloreIndia

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