Effect of titanium additions on the strain-aging characteristics and mechanical properties of carbon–manganese reinforcing steels

Abstract

Strain aging in 0·2C–Mn steels is eliminated by the addition of 0·02−0·03% Ti which is approximately the stoichiometric addition for steels containing 0·005−0·006%N. This critical amount of titanium also increases the Lüders strain and decreases the impact transition temperature of these reinforcing steels. It is suggested that the removal of soluble nitrogen is an important mechanism for lowering the impact transition temperature. Titanium additions in excess of the stoichiometric level resulted in a marked increase in impact transition temperature due to the precipitation of TiC. A regression equation for impact transition temperature which includes the effect of titanium is also presented.