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Abstract:
The paper presents the experimental results on the application laser pulses for evaluation of the surface layer integrity of materials and thin films. Short10 ns, strong 0.5-1.2 J pulses have been used to induce a stress wave in the tested materials. The stress wave induced plastic deformation of the surface of the tested materials and delamination of thin films. The hardness test was elaborated at a strain rate of 107 s-1. The method was used to evaluate dynamic hardness of typical materials. The achieved results showed good repeatability of the measured values, and the developed method proved to be sensitive to even small changes in the properties of the tested materials. The residual stresses of thin films using the LST (Laser Spallation Technique) method were also analyzed at work. The tests were carried out for PVD films on steel substrate. Based on the geometry of the separated film, the residual stresses in films can be determined with high accuracy. The residual stress value obtained by the LST method was consisted with XRD method.

Abstract:
The paper will present results of the research on the surface layer condition/integrity after ultrasound treatments supported by the electrodischarge coating (EDC). Features determiningthe product quality like geometric structure of the surface, microhardness or metallographic microstructure will be evaluated. The assumption of ultrasonic treatment introduction during EDC is stabilization of the alloying process reveals in the improvement of the useful properties of object after electrodischarge alloying.