MECHANICAL PROPERTIES OF HIGH-ALLOYED, DISPERSION-HARDENED, MARTENSITIC CAST STEEL AFTER MULTI-STAGE HEAT TREATMENT

High-alloyed Cr-Ni-Cu cast steel with additions of Mo and Nb and high nitrogen content was melted. The cast test ingots were subjected to a heat treatment. Metallographic examinations were made under an optical microscope and mechanical properties were determined. The most effective heat treatment cycles applied to the examined cast steel have proved to be the following ones: to obtain maximum hardness - solution heat treatment from 1060°C and tempering at 500°C, to obtain maximum strength - solution heat treatment and double tempering at 600°C. To obtain maximum elongation and impact resistance - quenching from 950°C followed by tempering at 600°C.

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