Abstract
To verify and maintain the integrity of duplex stainless steels currently in service, we conducted a study aiming to develop a method to nondestructively estimate their Charpy-impact energy at room temperature. Hardness of the ferrite phase was found to be a reliable indicator of the process of embrittlement during long-term heating of duplex stainless steels, but further information on the ferrite phase and the austenite phase is required for the estimation of Charpy-impact energy. An equation involving the hardness values of the ferrite and austenite phases, the ferrite content and the average spacing of ferrite-phase islands was found to be applicable in the nondestructive estimation of Charpy-impact energy at room temperature.
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