In the present study, the effect of the percentage of carbides MC and C M 2 is analyzed on the hardness of HSS steel used to manufacture lamination rolls; heat treatment was given to one piece of the material, with high Cr, Mo and V contents. This was subsequently cut and prepared, according to ASTM the standards to measure microhardness from the carbides, the percentages of each one of them and the macrohardness of the material. Applying different techniques of characterization the evolution of the hardness in the microstructure became evidenced; what we found was that the highest hardnesses is obtained when the amount of carbides C M 2 is approximately 50% of the amount of MC carbides (ratio of about 2% MC per 1%).It is also possible to verify that there is a hardness drop of 3.14% of the surface with respect to the center, this is due to a 6.27% reduction in the %MC and C, %M 2 which means that there is a hardness drop of 1% approximately with respect to the reduction of carbides in 2%.
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