Abstract
The paper presents an experimental study of ultrasonic surface waves propagation in the low carbon steel specimens with different degree of degradation of microstructure and mechanical properties, subjected to tensile deformation. The purpose of this paper is to investigate and analyze the dependence between microstructure, mechanical and acoustic properties and to find appropriate parameters for stress state evaluation. For identification of degradation and stress state we use ultrasonic Rayleigh waves (URW) velocity variation obtained by in-line and off-line measurements. The degradation is imitated by structural changes caused by heat treatment.
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