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The impact fracture morphologies of (a) 0Cu-steel tempered at 450 °C, (b) 1Cu-steel tempered at 450 °C, (c) 3Cu-steel tempered at 450 °C, (d) 0Cu-steel tempered at 600 °C, (e) 1Cu-steel at tempered 600 °C, and (f) 3Cu-steel tempered at 600 °C.
