Surface Layer Analysis after Shot Peening by Barkhausen Noise Signal

In the paper there will be introduced method for relative determination of induced kinetic energy of hardened balls on treated surface, which was invented by J. Alemen. In our experimental work we were focused on measuring Barkhausen noise signals and comparison with microstructure, microhardness, and residual stress analysis of surface roughness. In process of shot peening there is occurrence of compressive residual stresses. The shot peening process was performed under four different pressures (4, 6, 8 and 10 bar) and in two different acting times (t1 = 30 sek and t2 = 60 sek). Residual stresses in surface layer were determinated with nondestructive micromagnetic method on the basis of magnetic Barkhausen noise. Comparsion of residual stresses was also determinated by semi-destructive method known as blind hole-drilling method.