THE APPLICATION OF THE IONIC NITRIDING PROCESS ON STEELS FOR TOOLS AND COLD DEFORMATION DEVICES MANUFACTURING

摘要

This work is a study, on experimental basis, concerning the way of application of the ion nitriding process for tools used for cold deformation of metals, with special referring on 12% Cr steels. It takes VMoC 120 steel like representative steel grade (that means an alloyed steel with V = 0.3%, Mo = 0.5%, Cr = 12% and C = 1.6%). The technological parameters used in the secondary heat treatment applied on these kinds of steels are presented in the first part of the work. The experimental studies are made to find the best technological parameters of the ionic nitriding process for VMoC 120 steel and are presented in the second part of the paper. The fatigue strength tests are made for durability testing of the layers obtained. The experimental results and the tests made with fatigue strength tests show that the ionic nitriding application on these tools, in the best conditions experimentally stated set out the obtaining of superficial layers configurations that increase with almost twice the life time in their exploitation.