Browsing by Author "Paunov V."

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    Recast layers on high speed steel surface after electrical discharge treatment in electrolyte
    (2016-06-01) Krastev D.; Paunov V.; Yordanov B.
    In this work are discussed some experimental data about the obtaining of recast layers on the surface of high speed tool steel after electrical discharge treatment in electrolyte. The electrical discharge treatment of steel surface in electrolyte produces a recast layer with specific combination of structure characteristics in result of nonequilibrium phase transformations. The modification goes by a high energy thermal process in electrical discharges on a very small area on the metallic surface involving melting, alloying and high speed cooling in the electrolyte. Obtained recast layers have a different structure in comparison with the metal matrix and are with higher hardness, wear- and corrosion resistance.
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    Surface modification of steels by electrical discharge treatment in electrolyte
    (2014-02-25) Krastev D.; Paunov V.; Yordanov B.; Lazarova V.
    In this work some experimental data about the influence of applied electrical discharge treatment in electrolyte on the surface structure of steels are discussed. The electrical discharge treatment of steel surface in electrolyte gives a modified structure with specific combination of characteristics as a result of nonequilibrium transformations. The modification is performed by a high energy thermal process in a very small volume on the metallic surface involving melting, vaporisation, activation and alloying in electrical discharges, and after that cooling of the surface with high rate in the electrolyte. The surface layer obtains a different structure in comparison to the metal matrix and it possesses higher hardness, wear resistance and corrosion resistance.