Effect of carbonitride dissolution on Tδ and Vδ of austenitic steels

The authors deal with the effect of carbide dissolution on the γ/γ + δ boundary temperature, Tδ, and the δ phase volume, Vδ, as well as the equilibrium relation between the alloying elements at the γ/γ + δ boundary of austenitic steels at high temperature, and study the variation of the ferrite volume with temperature in α + γ dual phase steel. The relevant expressions are derived from many experimental results, which may provide a basis for quantitative calculation, the design of compositions, the determination of working processes, and prediction of the mechanical properties and microstructure of the austenitic steels.