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Effect of solution treatment temperature on theprecipitation kinetic of ?-phase in 2205 duplexstainless steel welds

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Materials Science and Engineering: A

Volume 496, Issue 1, 2008, Pages 447-454

Effect of solution treatment temperature on the precipitation kinetic of ?-phase in 2205 duplex

stainless steel welds

Riad BADJI, M. BOUABDALLAH, B. BACROIX, C. KAHLOUN, Khireddine BETTAHAR, Nabil KHERROUBA

Abstract: The effect of the prior solution treatment temperature on the ?-ferrite transformation in 2205 duplex stainless welds after aging at 850 °C has been studied. Microstructural examination showed that the ?-phase and M23C6 chromium carbides precipitate at the ?/? interfaces and within the ?-ferrite grains. Increasing the solution treatment temperature from 1050 to 1250 °C delays the

?-phase formation and favours the precipitation of intragranular secondary austenite ?2. The simulation of the ?-phase precipitation kinetic in the base metal, HAZ and weld metal, indicates a good agreement between the experimental fitted data and the modified Johnson–Mehl–Avrami model. The results indicate a marked sensitivity of the ?-phase precipitation kinetic to the solution treatment temperature. A high precipitation rate corresponds to a fine grained structure with ferrite enriched in ? forming elements (Cr, Mo)

Keywords : duplex stainless steel, welding, ageing, precipitation kinetic, Johnson-Mehl-Avrami model

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