Influence of partitioning process during Q&P heat treatment on the microstructure and properties of medium carbon cast steel ZG30MnSiMo (1.5 % Mn – 1.5 % Si)

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The microstructure and properties of medium carbon cast steel ZG30MnSiMo(1.5 % Mn – 1.5 % Si) subjected to heat treatment of quenching and partitioning (Q&P) are investigated. The results show that the microstructure of cast steel after this heat treatment mainly consists of lath martensite and residual austenite. With the increase in temperature or in the time of partitioning, granular carbides appear inside martensitic matrix, the volume fraction of residual austenite gradually increases, and the tensile strength gradually decrease, the elongation gradually and impact toughness increases. The parameter for effectively controlling PSE (Product of Strength and Elongation) is the temperature of partitioning. Compared to quenching low-temperature tempering treatment, the tested cast steel treated with quenching and partitioning has a higher hardening index, which shows that quenching and partitioning treatment helps to improve the wear resistance of cast steel.

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