Publisher： Maney Publishing
ISSN： 1743-2847
Source： Materials Science and Technology, Vol.29, Iss.5, 2013-05, pp. : 529-533
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Abstract
The kinetics of austempering of two ductile iron alloys, Fe-3·5C-2·5Si and Fe-3·6C-2·7Si-0·7Cu, was investigated. The alloys were austempered for various times at 623 K (350°C) and 673 K (400°C), followed by water quenching. The first ferrite needles nucleate mainly at the graphite/austenite interface. Copper addition decreases the ferrite needles’ dimensions, increases the autocatalysis factor and increases the austempering rate. Decreasing the austempering temperature from 673 K (400°C) to 623 K (350°C) results in a decrease in the ferrite needles’ dimensions, an increase in the autocatalysis factor and a decrease in the austempering rate. A modified quantitative kinetic model for austempering of ductile iron, which takes into account the graphite nodules as ferrite nucleation sites, was developed. The change in the ferrite needles’ dimensions is explained by the interplay of the
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