Window process of an austempered ductile iron with alloying carburizers
Abstract
In this work, we did different austempering´s heat treatments in a ductile iron alloyed with 0.45% Cr and 0.2% V to determinate the window process. The ductile iron was treated in a temperature of 900°C in 60 minutes; after that it moved to another oven with times between 15 to 90 minutes and a temperature of 285°C. In this heat treatment we get two known phases called acicular ferrite and austenite with a major part of carbon. The last phase is analyzed using X-rays´s diffraction in the samples treated in different times. Austenite´s major value was obtained in 60 minutes with a percentage of 35%; meanwhile the minor value was obtained in 15 minutes with 21.7%. Additionally, the samples were evaluated in hardness test. The hardness ´highest value was obtained in 30 minutes (59.9 HRC) and the lowest value was obtained in 90 minutes (53.9 HRC). According with the test was determinate the window process between 60 and 90 minutes.
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