Microstructure and Mechanical Properties of Gradient Nanostructured Q345 Steel Prepared by Ultrasonic Severe Surface Rolling

Figure 4

High-magnification EBSD result of the USSR sample in the topmost surface: (a) BC image, (b) misorientation change along the arrow in (a), (c) IPF map, and (d) KAM map. Black and white lines in (a, c) profile the HAGBs and LAGBs, respectively.