Decreasing trends of grain size and austenite fraction, as well as an increasing trend of the dislocation density, are obtained across the thickness direction from the base material zone to the transition zone and finally to the stirring zone, which results from the simultaneous effect of severe plastic deformation and recrystallization during friction stir processing.
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Fabrication of Medium Mn Advanced High-Strength Steel with Excellent Mechanical Properties by Friction Stir Processing.
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