Effect of Austempering Time and Temperature on Microstructure and Phase Fraction of Austempered Ductile Irons
This article aims to present the results of studying the influence of austempering time and temperature on the microstructure and phase fraction of Austempered Ductile Irons (ADI). The phase fraction in the ADI affects the alloy properties. The research found the best conditions in terms of phase fraction and mechanical properties: the heat treatment process of this alloy is austenitized at 900°C for 2 hours; quenched and held at 780°C for 2 hours; and then austempered at 360°C for various times ranging from 5 to 120 minutes. At this austempering temperature, the higher the Martensite fraction and the lower ausferrite fraction can be obtained. The content of ferrite remains unchanged at the same holding time. When the austempering time increases from 5 to 120 minutes, the content of martensite decreases gradually, whereas the ausferrite phase increases. The ferrite formed in the 2-phase zone has remained without transformation. In the time interval between 90 to 120 minutes, the stable and high carbon ausferrite can be observed (depending on the heat treatment parameters mentioned above). This time domain is called the process window when % M <5%. The resulting mechanical properties show the effect of microstructure and heat treatment process on properties of this alloy.
Keywords: Austempered Ductile Irons, austempering time, phase fraction, dual matrix.
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