Verfahren zur Aenderung der lokalen Gefuegestruktur an der Oberflaeche eines Werkstoffes mittels Hochenergiebestrahlung

The invention relates to a process and a device for the modification of the local grain structure on the surface of a material in the solid and liquid phases. The surface of the processing site is heated to a specific temperature by high energy radiation. The temperature arising there is measured. The actual values thus obtained are modified by a control unit by modifying the emission of the high-energy radiation source in the direction of the desired nominal value. After the heating phase of the material, the temperature-time curve is measured during the cooling phase. The temperature is therefore measured at at least two different points in time on the surface of the material at the site of processing. The control of the temperature-time curve during the remainder of the cooling process takes place by the fact that at least one further exposure of the material to high-energy radiation takes places at the site of processing in such a way that a resulting temperature-time curve request ed in advance is obtained at the site of processing while the material is cooling.