Degree and depth of hardening under pendulum surface plastic deformation of carbon steel

The article discusses influence of the main technological parameters pendulum surface plastic deformation (SPD) on mechanical properties layer cylindrical parts made carbon steel. Using hardness tester HBRV-187.5 and microhardness HMV-G21, we determined layer, depth work-hardened hardened parts. In addition, results calculating hardening degree are presented, which is important information for evaluating effectiveness SPD method in terms improving metal properties. Experimental studies showed that after (at different processing modes), increases by 9 – 12 % compared to original surface, 1.5 1.7 times, leads a significant billet layer. Depth varies range 0.9 1.1 mm, while 45 65 %. software package Statistica 10.1, allows solving optimization problems based statistical analysis building an model, optimal modes SPD. These simultaneously provide both maximum highest They formed under following modes: radial interference t = 0.15 0.2 mm; longitudinal feed s 0.07 0.11 mm/rev; rotation frequency n b 160 200 min −1 ; working tool movement 110 130 strokes/min; angular amplitude α 35 40°. According experimental data numerical calculations, it was established average grain size decreases 30 40 initial size, dislocation density 2.5 times.