723919.fig.003a
(a)
723919.fig.003b
(b)
723919.fig.003c
(c)
723919.fig.003d
(d)
Figure 3: (a, b) Tools for the roto-peen machining; (c) view of a trace of a single ball hit; (d) its profilogram (Fn = 400 N; 34 HRC).