During the follow-up of the cutting tools in the production workshops, we noticed that the cutting tools operate in severe conditions, for this we thought to improve their mechanical characteristics and increase their yield. Two key factors influencing these tools, namely geometry and heat treatment. In this study we chose the heat treatment, from a basic fast steel form tool, after making the milling cutter in the tool shop we proceeded to a revenue treatment to remove austenite residues. The purpose of our work is to increase the machining quota of a Z80WCV 18-0-1-01 high speed steel mill, for this reason our study is based on the reduction of residual austenite by incomes, cumulated after prior quenching for different austenitization temperatures (1210, 1260 and <$E1270~symbol Р roman C>).

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