Daber, S.Ravishankar, K.S.Prasad Rao, P.P.2026-02-052008Journal of Materials Science, 2008, 43, 14, pp. 4929-4937222461https://doi.org/10.1007/s10853-008-2717-8https://idr.nitk.ac.in/handle/123456789/27726The 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. © 2008 Springer Science+Business Media, LLC.CopperDuctilityImaging techniquesIronLithographyMartensiteMicroscopic examinationMolybdenumNickelOptical microscopyTensile testingX ray analysisX ray diffraction analysis(O-sec.-butyldithiocarbonatio-S ,S') copperAustempered ductile iron (ADI)AustemperingBusiness mediaDuctile ironHollomon equationOptical (PET) (OPET)Reactivity (Chemical)special sectionsSpringer (CO)Strain-hardeningStrain-induced martensiteTensile testsTreatment conditionsX ray diffraction (XRD)Temperature