Construction of a Gradient Nanostructure for Enhanced Surface Properties in 38CrMoAl Steel via Ultrasonic Severe Surface Rolling.

The average wear volumes of the T600, T650, and T700 samples are 1.50 ± 0.17 × 10 −3 mm 3 , 2.0 ± 0.2 × 10 −3 mm 3 , and 2.17 ± 0.15 × 10 −3 mm 3 , respectively, showing an increasing trend with higher tempering temperature.

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