Abstract
This work analyzes the secondary carbide precipitation during the destabilization heat treatment of a 15 % Cr white iron and copper additions between 0.5 and 2 wt%. The destabilization heat treatments were undertaken at temperatures of 850, 950, and 1050 ∘C between 5 and 480 min. Characterization was carried out by X-ray diffraction (XRD), optical and electron microscopy, image analysis, and energy-dispersive spectroscopy (EDS) microanalysis; the resultant hardness was also measured. It was found that the copper addition resulted in an increase in discontinuity of the eutectic carbide in as-cast conditions. After the heat treatment, the number of precipitated carbides increased with the copper addition, and they were found smaller. There were an increase of precipitation for lower destabilization temperatures and large soaking times.
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