METHOD FOR STRENGTHENING METALLIC SURFACES Russian patent published in 2001 - IPC

FIELD: metal treatment, possibly in general machine engineering for making machine and tool parts with enhanced wear resistance. SUBSTANCE: method comprises steps of heating surface of strengthened object in strengthening zone up to melting temperature and cooling at acting upon it by magnetic field with plane of magnetic flux lines normal relative to direction of friction force vector at operation or plane of magnetic flux lines coincides with direction of above mentioned vector. Magnetic field intensity in kA/m is set in range 35-40 at strengthening carbon steels, in range 50-60 at strengthening alloyed steels and in range 75-80 at strengthening high speed steels. In the result crystal growing in surface layers occurs in plane of magnetic flux lines and it provides anisotropy of metal properties. EFFECT: enhanced wear resistance of metal due to directed anisotropy of metal properties. 3 cl, 2 dwg, 1 tbl, 1 ex