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* Miroslav Neslusan, Jan Moravec Faculty of Mechanical Engineering, University of Zilina, Slovakia E-mail: mirolav.neslusan@fstroj.uniza.sk This paper deals with the non destructive evaluation of components after the plasma nitridation via the Barkhausen noise techniques. Effect of different surface states before the plasma nitriding is studied via the non destructive Barkhausen noise technique, as well as the conventional destructive techniques. Bending of flat samples to different bending angles was performed and magnetic, as well as conventional destructive testing, was carried out on the outer, inner and flat surfaces. The results of experiments show that the Barkhausen noise emission is a function of the heat treatment, whereas intensity of bending and the corresponding deformation are only minor. The different states of the surface before the plasma nitriding result into the similar thickness of the compound layer. Furthermore, the underlying diffusion of near the surface layer state is different.

Influence of Components Bending on the Consecutive Plasma Nitridation and Barkhausen Noise Emission