The results of the X-ray diffraction analysis of the pearlitic - ferritic ductile iron with the addition of Ni are presented. The cast iron was heat treated by austenitizing with the following austempering carried out under different conditions. Investigations covered the crystal structure parameters as well as the volume fractions of both austenite and ferrite. The effect of heat treatment parameters, i.e. of the time and temperature of austempering, on the austenite volume fraction and carbon content in this constituent was investigated.Keywords: Ductile iron, austempered ductile iron (ADI), X-ray diffraction
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