ORAL

SESSION: MetalsWedAM-R10	3rd Intl. Symp. on Sustainable Metals & Alloys Processing
Wed Oct, 25 2017	Room: Maria Mercedes & Maria Beatriz
Session Chairs: Vera Vorob'eva; Ranjit Dalwatkar; Session Monitor: TBA

11:30: [MetalsWedAM02]
Effect of Austempering Temperature and Time on Mechanical Properties of SAE 9260 Steel
Ranjit Dalwatkar¹ ; ¹Bharat Forge Ltd, Pune India., Pune, India;
Paper Id: 309 [Abstract]

This work describes the effect of austempering heat treatment on microstructure and mechanical properties of SAE 9260 steel. Steel samples, austenitized at 900 C for one hour, were isothermally heat-treated in the temperature range 300 to 350 C for different lengths of time. Microstructural characterization was carried out using optical and scanning electron microscopes. The microstructure of the austempered samples consisted of bainitic ferrite and retained austenite. The volume fraction of retained austenite was determined using X-ray diffraction. Isothermal heat treatment at 350 C for 20 min, resulted in a retained austenite content of around 38% in the microstructure. The increase in isothermal transformation temperature led to an increase in the fraction of retained austenite. Additionally, a good combination of strength and ductility was obtained in the samples with increased amounts of retained austenite.