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Duplex stainless steels with high nitrogen content offer high strength and excellent corrosion resistance and have been used for a wide variety of applications, such as in chemical tankers and desalination plants. Although the material properties of duplex stainless steel depend on the ferrite/austenite phase balance1), the phase proportion is affected not only by the chemical composition, but also by the cooling rate. Therefore, kinetic analyses of precipitation for the austenite (γ) phase, which has higher nitrogen solubility than ferrite, have previously been conducted2,3). However, this requires the acquisition of substantial amounts of experimental data for each alloy, and a statistical analysis of the data must also be performed. In addition, the composition profile could not be predicted in previous studies, although the nitrogen content in the ferrite phase significantly affects the pitting corrosion resistance in duplex stainless steels4). The authors investigated the microstructure formation process of duplex stainless steel using a liquid-tin quenching method and revealed dendrite growth in the δ-phase and γphase formation by solid-state transformation5,6). Based on these results, the microstructure formation process was simulated in duplex stainless steel using a multiphase field (MPF) method. The simulation results obtained are presented in this paper. The MPF method7,8) was found to be capable of simulating the microstructure formation process in multiphase and polycrystalline systems, as well as analyzing complex microstructure morphology and composition distribution, such as those of dendrites during solidification. The purpose of this study is to simulate the microstructure formation process using the MPF method and to estimate the effect of cooling rate on the formation of γ phases. 2. ANALYSIS METHOD

Simulation of Microstructure Formation Process in Fe-23Cr-6Ni-3Mo-0.1N Alloy Using Multiphase Field Method