Composite materials (CM) are widely used for hardening of wearing parts operating at high temperature wear types. They are based on high-melting hard alloys, as which are used carbides of transition metals of IV – VI groups A determining the physics of high-temperature wear. For these purposes baked TiC of TN 20 type on the basis of (Ti, Mo)C – Ni – Mo is used that has a ring structure preventing the formation of complex alloyed structures on the bounda ry of solid particle-matrix. Due to the minimal solubility of the sintered hard alloy of TN 20 type in the alloy-bond, at the interface of solid particle – matrix practically does not stand out complex structural phases causing embrittlement and growth of residual thermal stresses and strains. It leads to increased wear resistance and longer service life of hardened parts. In order to increase the opera ting efficiency of metallurgical units due to hardening of spare parts with a composite material based on sintered hard alloy of the TN 20 type using electroslag surfacing (ESW), a comprehensive program has been developed to control the efficiency of hardening parts. In the management of hard alloy surfacing the special attention is given to heat and high temperature wear resistance determined by the set of CM properties of solid particles. Therefore, maintaining of high mechanical, thermal and energy characteristics of carbides and decrease of the solubility of solid particles in a CM matrix at surfacing is a priority for improving efficiency in hardening process of spare parts. Integrated ESW management program for CM is based on effects, aimed to prevent the formation of complex alloyed structures on surface of the solid section of particle-matrix; to reduce thermal stresses and deformations (leading to the cracks formation, chipping and deleting solid particles in abrasive wear) and to improve high temperature wear resistance. Use of the developed control systems for hardening process of metallurgical equipment wearing parts has significantly increased the service life of spare parts and producti vity of the metallurgical units, which ensured a certain economic effect.
EFFICIENCY OF HARDENING OF METALLURGICAL EQUIPMENT SPARE PARTS BY HARD ALLOY