Lunika M. Improvement of cold-working die steels performance using rational alloying and heat treatment

Subject of research: increasing structural strength of cold-working die steels. The purpose of research: improvement of resistance of cold-working dies produced from the steels melted using the wastes of basic production taking into account a new approach to their alloying and surface strengthening. Methods of research: optical and electron microscopy, X-ray diffraction and X-ray spectrum analysis, the measurement of electrical resistance, magnetic saturation, coercive force. For evaluation of performance the mechanical properties of steels and die resistance were determined. Theoretical and practical outcomes: the new approach to steels alloying is proposed. It is based on choosing alloying elements and their quantity so that to minimize lattice distortion during solid solution formation. It was called the principle of compensational alloying. Die resistance increases 1.7 … 12 times. Subject and extent of application: The recommendations have been used on the Sumy plant “NASOSENERGOMASH”. Sphere of a pplication – machine building, tool , metallurgical plants.