Effect of the austempering temperature in CADIs alloyed with Chromium
Abstract
The ductile irons with carbides inside of metallic matrix that were heat treated through austempering are called CADIs. These materials present high mechanical properties such as hardness and wear resistance. In this work, CADIs alloyed with 0.2 %Cr were obtained using austempering temperatures of 265 and 305 °C together with austempering times of 30, 60, 90 and 120 min. The microstructural characterization was carried out employing the light microscopy and scanning electron microscope, the quantitative analysis with Image software, while mechanical characterization using hardness and wear resistance. The results showed that the ausferritic matrix was obtained at 90 min of austempering heat treatment, while the window process in the temperatures range from 60 to 120 min. The highest volume fraction of high carbon austenite (14.45 %) was obtained in CADI-305. The highest Rockwell C Hardness of 41 HRC and wear resistance of 0.42 mm3 were obtained with CADI-265.
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