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Structure Investigation of the Constructional Steel St3ps after Argon-Arc Plasma Treatment

The plasma processing causes a change of a surface layer structure and characteristics of the surface layer of the material. During plasma processing the surface is subjected to ultrafast heating and cooling which causes a thin hardened layer, and the resulting non-equilibrium structure of the layer provides properties that are different from the properties of the base metal. Since transformations in alloys due to the ultrafast heating by highly concentrated energy flows are not sufficiently explored, the surface layer structural state and its properties are of a great practical and scientific interest. The article presents study results of the St3ps steel after surface hardening with plasma arc. To study the structure of steel, the author used the microanalysis, the magnetostructural Barkhausen Noise Method; residual stresses have been determined by the x-ray diffraction. The study revealed correlation between the processing mode, steel microstructure, residual stress values and the Barkhausen noise amplitude.