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- W2163378462 abstract "The investigation was carried out to examine the in fluence of temperature and times of austempering pr ocess on the maximum extend to which the bainite reaction can proceed and the carb on content in retained austenite. It should be note d that a small percentage change in the austenite carbon content can have a significant eff ect on the subsequent austempering reaction changin g the volume fraction of the phases present and hence, the resulting mechanical propert ies. Specimens were prepared from an unalloyed ductile cast iron, austenitised at 950 o C for 60 minutes and austempered by the conventional single-step austempering process at four temperatur es between BS and MS, eg., 250, 300, 350 and 400 o C. The samples were austempered at these temperatures for 15, 30, 60, 120 and 240 minutes and finally q uenched to ambient temperature. Volume fractions of retained a ustenite and carbon concentration in the residual a ustenite have been observed by using X-ray diffraction. Additionally, carbon conce ntration in the residual austenite was calculated u sing volume fraction data of austenite and a model developed by Bhadeshia based on the McLellan and Dunn quasi-chemical thermodynamic model. The comparison of experimental data with the T0, T0' and Ae 3' phase boundaries suggests the likely mechanism of bainite reaction in cast iron is displacive rather than diffusional. The carbon concentration i n retained austenite demonstrates that at the end o f bainite reaction the microstructure must consist of not only ausferrite but additionall y precipitated carbides." @default.
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- W2163378462 date "2007-01-01" @default.
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- W2163378462 title "Carbon Concentration of Austenite in Austempered Ductile Iron (ADI)" @default.
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