Medium Carbon Q&P Steel with High Product of Strength and Elongation

Abstract

The Fe-0.44%C-1.8%Si-1.3%Mn-0.82%Cr-0.28%Mo steel treated by the quenching-partitioning process showed a product of strength and elongation of 30 GPa×% with the yield stress of 1150 MPa. The influence of the partitioning time on the structure and mechanical properties is discussed. It is shown that the volume fraction of retained austenite depends on carbon content in the solid solution of primary martensite. The formation of bainite leads to no deterioration of mechanical properties.