Establishment of a theoretical model based on the phase-field method for predicting the γ phase precipitation in Fe–Cr–Ni ternary alloys

Abstract

In this study, the phase-field method was used to quantitatively predict the precipitation phenomenon of the γ phase in Fe–Cr–Ni ternary alloys. Specifically, a kinetic analysis of the aforementioned phenomenon was performed in duplex stainless steel (DSS) based on theoretical considerations. The calculation-based γ phase precipitation results for lean, standard, and super DSSs were verified through comparisons with experimental data. The possibility of applying the phase-field method established in this study to DSSs with different chemical compositions was also evaluated. The temperature dependences of the experimental and calculated values were found to be in good agreement, indicating that it is possible to theoretically predict the precipitation phenomenon of the γ phase using the proposed phase-field method. Moreover, the proposed model achieved satisfactory kinetic results regardless of the type of steel assessed.