Abstract
In the present study, the microstructure and corrosion behavior of duplex stainless steel (DSS, S32950) after aging, laser surface melting (LSM) without and with subsequent re-aging were investigated. After LSM, the pitting corrosion resistance of the aged DSS was restored. It is attributed to re-dissolution and removal of M23C6, σ and γ2 phases. The purpose of re-aging is to investigate the phase balance and hence corrosion performance of the laser-melted DSS after subjected to isothermal aging at 800 °C, a condition which might be encountered during application. Results of the present study show that the laser-melted specimens after re-aging is less susceptible to pitting corrosion because the content of γ2 (the anode) is close to that of σ and δ (the cathodes).
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