Abstract
A novel direct quenching–partitioning–tempering (DQ–P–T) process was developed to produce a low-alloy Mn–Si–Cr type high performance cast steel for automobiles without using expensive alloying elements Ni, Mo, or Nb as commonly used in some rolled Q–P–T steels. The cast steel treated by DQ–P–T process exhibits a better combination of strength and ductility as well as higher impact toughness than that treated by the conventional reheat quenching and tempering (RQT) process, and shows the improved microstructure consisting of the dislocation-type lath martensite (or plus a little bainite) and nano-sized flake-like retained austenite between the martensite laths. The DQ–P–T process has shown to be more conducive to enhancing the overall mechanical properties of the cast steel compared with traditional RQT process, and is a promising technique for industrial production.
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