As the rotation speed increased (450, 500, and 550 rpm), the grain size showed an increasing trend (7.2 ± 0.6 μm, 7.4 ± 0.5 μm, and 7.7 ± 0.3 μm, respectively), and the kernel average misorientation showed a decreasing trend (5.0, 4.8, and 4.3, respectively), as shown in Figure 24 [ 40 ].
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In terms of mechanical properties, the results are summarized in Figure 25 ; as we can see, strength (YS and UTS) showed a decreasing trend, but the EL showed a slightly increasing trend [ 40 ].
As the rotation speed increased (450, 500, and 550 rpm), the grain size showed an increasing trend (7.2 ± 0.6 μm, 7.4 ± 0.5 μm, and 7.7 ± 0.3 μm, respectively), and the kernel average misorientation showed a decreasing trend (5.0, 4.8, and 4.3, respectively), as shown in Figure 24 [ 40 ].