Abstract：With Thermocalc thermodynamic equilibrium phase calculations and experimental analysis, the effect of chemical compositions and heat treatment temperature on δ-ferrite content in T122 heat resistant steels was studied. The results show that chemical compositions and heat treatment temperature affect δ-ferrite content obviously. Decreasing chromium content and increasing nitrogen, carbon content can decrease δ-ferrite content greatly. There is a proper heat treatment temperature zone ranging from 1030℃ to 1070℃, which leads to the lowest δ-ferrite content. When the temperature exceeds 1200℃, the reaction happens, γ-Fe→γ-Fe +δ-Fe, and δ-ferrite forms in the steel which doesn’t contain δ-ferrite treated temperature below 1200℃.
2009, Vol. 44 
