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Ductile iron was quenched using two-variant isothermal transformation. The first treatment variant consisted of one-phase austenitization at a temperature t γ = 830, 860 or 900°C, cooling down to an isothermal transformation temperature of 300 or 400°C and holding from 8 to 64 minutes. The second treatment variant consisted of two-phase austenitization. Cast iron was austenitizied at a temperature t γ = 950°C and cooled down to a supercritical temperature t γ' = 900, 860 or 830°C. Isothermaldoi:10.2478/v10266-012-0029-6 fatcat:x7qe3phscfb4vhqriikvoxy254