Abstract
ABSTRACTIn this paper, we attempt to review our recent works on the ultrahigh strength Mn–Si–Cr–C steels treated by BQ&P and BQ–P–T processes. The core of these novel processes is to incorporate the formation of carbide-free bainite during the initial quenching step (rather than partitioning step) of Q&P process and to achieve a fine multiphase microstructure (bainite + martensite + retained austenite). Our studies showed that the enhanced ductility, toughness and fatigue properties were achievable in the ultrahigh strength BQ&P and BQ–P–T steels, which is mainly attributed to the refined multiphase microstructures.
Highlights
Quenching and partitioning (Q&P) process has been proposed to produce high strength steels, which exhibit higher ductility than martensitic steels after conventional quenching and tempering (Q&T) treatment [1,2]
This paper makes an attempt to review our recent works on the ultrahigh strength Mn–Si–Cr–C steels treated by the bainitic transformation plus quenching and partitioning (BQ&P) processes
Our studies show that the optimization of properties can be achieved by designing the BQ&P and BQ–P–T processes
Summary
Quenching and partitioning (Q&P) process has been proposed to produce high strength steels, which exhibit higher ductility than martensitic steels after conventional quenching and tempering (Q&T) treatment [1,2]. Q&P steels with a multiphase microstructure of carbon-depleted martensite and carbon-enriched retained austenite exhibit an excellent combination of strength and ductility due to the transformation induced plasticity (TRIP) effect of the retained austenite.
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