Electropulsing-induced strengthening of steel at high temperature

Lu, W.J.; Zhang, X. F. and Qin, R. S. (2014). Electropulsing-induced strengthening of steel at high temperature. Philosophical Magazine Letters, 94(11) pp. 688–695.

DOI: https://doi.org/10.1080/09500839.2014.961583


Electropulsing usually promotes a metastable phase to evolve towards its equilibrium state. This work reports an alternative case, where electropulsing promotes the decomposition of the stable δ-phase in duplex stainless steel at high temperature. This decomposition enables both the γ-phase and the σ-phase in the steel to survive and hence to strengthen it at high temperature. The hardness of the quenched sample with electropulsing treatment is 49.4% higher than that without electropulsing treatment. A fundamental understanding of the observation is developed.

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