Effect of Two-Stage Austenitization on Microstructure and Microhardness of Austenitic-Ferritic Cast Iron

Resumo

Comparative analysis of the microstructure and microhardness of austenitic-ferritic high-strength iron after heat treatments involving single-stage and double-stage quenching from the austenitic or intercritical temperature ranges and tempering is performed with the use of dilatometry, measurement of microhardness, and optical and scanning electron microscopy. The possibility of the use of two-stage austenitization for heat treatment of austenitic-ferritic cast irons for raising their properties is studied.