Prediction of 475℃Embrittlement in Stainless Steel Welds using Phase Field Model

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In order to predict the 475℃embrittlement phenomena in a ferritic phase of stainless steel welds, computer simulation of spinodal decomposition behaviour in Fe-Cr-Mo and Fe-Cr-Ni ternary alloys was conducted based on the phase field model. A beginning time for spinodal decomposition was shortened with an increase in the Cr and Mo contents in Fe-Cr-Mo alloy, while it did not change so much with Cr/ Mo ratio. Spinodal decomposition was drastically delayed with an increase in the Ni content in Fe-Cr-Ni alloy. The predicted hardness of a ferritic phase at service exposure temperature(561 K) with FA mode began to increase at the holding time approx. 5 Gs, while that with AF mode began to increase at the holding time as long as approx. 150 Gs.