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A novel method, i.e. multi-cyclic quenching and partitioning (M-Q-P) heat treatment, is used to tailor the content of retained austenite (RA) in commercial steels. For 35CrMnSi steel, 5 times of Q-P heat treatment can increase the content of RA from 8 vol. % to 17 vol. %. As a result, the ultimate elongation of the steel is improved from 17.4% after the typical Q-P heat treatment to 27.1% after 5...
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