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Formation and Annealing Behavior of Nanocrystalline Steels Produced by Ball Drop Test

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Figure

Figure 3 shows the nanocrystalline layers formed symmet-rically along the ball falling axis in a specimen rolled to 82%
Fig. 4Shear deformation in the samples with pearlite structure after balldrop (5 kg, 1 m) (a) 3 times without prior deformation and (b) 1 time withprior deformation (80% rolling reduction, 10% per pass).
Fig. 5Annealed (873 K for 3.6 ks) microstructures of the samples withpearlite structure after deformation (a) 30 times of ball drops (5 kg, 1 m)and (b) Fe–0.89C ball milled for 360 ks.
Fig. 7Annealed (873 K for 3.6 ks) microstructures of the samples withspheroidite structure after deformation (a) 50 times of ball drops (5 kg,1 m) and (b) Fe–0.89C ball milled for 360 ks.

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