296 Prakt. Met. Sonderband 38 (2006) 
ME 
4. CONCLUSIONS MU 
The laser alloying tests of the 32CrMoV12-28 and X40CrMoV5-1 steels surface layer with SU 
the WC powder revealed that with the correctly selected alloying parameters, like scanning 
rate, laser power, and gas protection method, it is possible to obtain the flat remelting face J. A 
with no cracks and with low roughness. The surface of the remelted area is more regular, . 
less rough and more flat with increasing laser power. The metallographic investigations on Dey 
the scanning microscope using the EDX analysis confirm the occurrence of tungsten carbide Univ 
WC, which are present in the matrix mostly in form of particles. Occurrences of the un- De 
melted tungsten carbide grains were observed in the structure and the increased tungsten de T 
content compared to the native material, whose variable concentration is connected with the 
molten metal fluctuation in the pool during alloying. 
The research results indicate to the feasibility and purposefulness of the practical use of 
remelting and alloying with the tungsten carbide using the high power diode laser, e.g., for AB: 
making new tools or for regeneration of the used ones from the 32CrMoV12-28 and 
X40CrMoV5-1 hot-work tool steels. In ti 
mart 
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char 
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