Acharya, P.P.Udupa, R.Bhat, R.2026-02-052018Materials Science and Technology (United Kingdom), 2018, 34, 3, pp. 355-3652670836https://doi.org/10.1080/02670836.2017.1393141https://idr.nitk.ac.in/handle/123456789/25262The present investigation is focused on evaluating the microstructure and mechanical properties of American Iron and Steel Institute 9255 high-silicon steel austempered at different temperatures and durations. Material characterisation was done using a scanning electron microscope and an X-ray diffractometer. Results show the bainite microstructure over a temperature range of 280–400°C. Bainite structure gains coarseness at higher temperatures at 360 and 400°C. A significant improvement in the tensile properties was observed for all austempered specimens; with a maximum tensile strength of 1852 MPa and elongation up to 35%. An excellent strain hardening response was observed from the samples austempered at temperatures of 360 and 400°C. Tensile properties were found to be superior at 15 min of austempering duration for all austempering temperatures. © 2017 Institute of Materials, Minerals and Mining.BainiteHardeningIron and steel industryMechanical propertiesScanning electron microscopySiliconSilicon steelStrain hardeningTensile strengthAmerican iron and steel institutesaustemperedAustempering temperatureHardening responseHigh-silicon steelMaterial characterisationMicrostructure and mechanical propertiesX ray diffractometersMicrostructure