Predictive computations of intermetallic σ phase evolution in duplex steel. II) Thermo-kinetic simulation in duplex and hyper duplex stainless steels AITranslate

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DOI：https://doi.org/10.1016/j.calphad.2020.101810

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Kinetic simulations of σ phase precipitation in duplex and hyper duplex stainless steels were carried out by employing mean field approach. For duplex and hyper duplex steels, time-temperature-precipitation (TTP) curves were calculated and compared with experimental results. Thermokinetic predictions confirm that segregation of Cr and especially Mo at grain boundaries of ferrite plays an important role for the nucleation of σ phase in ferrite. This is also reflected by the concentration change of dissolved Mo in σ phase from early nucleation stage to precipitation after long-term isothermal aging of several hours. From the present results, predictive simulations of modified alloy compositions are presented and discussed.