723919.fig.0012a
(a)
723919.fig.0012b
(b)
Figure 12: (a) Microhardness versus the distance from the edge for the specimen machined by the tungsten electrode at the following parameters. (a) EDA I = 24 (A), Ti = 400 (μs), (b) EDA I = 24 (A). Ti = 400 (μs) and then the roto-peen  (rev/min),  (s).