COMPARATIVE STUDY OF MICROSTRUCTURAL AND MECHANICAL CHARACTERISTICS OF THE DEPOSITED LAYER BY POWDER WIRE

Studies of the microstructure and mechanical characteristics of deposited coatings obtained using powder wires containing various alloying elements are presented. Special attention is paid to two types of hollow wires: EnDOtec DO*15, which consists of iron, chromium, molybdenum and tungsten, and the more complex Fe ‒ Si ‒ W ‒ Mn ‒ Cr ‒ C ‒ V system developed at the Siberian State Industrial University. The optimal structure of the samples was obtained, which made it possible to minimize the presence of non-metallic inclusions (silicates and oxides) that can negatively affect the mechanical characteristics of the materials. To assess the mechanical properties of the samples, measurements of nanohardness and modulus of elasticity were carried out using a NanoScan-4D nanohardometer. The structure of the EnDOtec DO*15 wire ensures a more uniform distribution of alloying elements, which in turn contributes to an increase in the strength of the material. The Fe ‒ Si ‒ W ‒ Mn ‒ Cr ‒ C ‒ V system has an increased number of nonmetallic inclusions, which negatively affects its mechanical properties. The best nanohardness values were recorded for EnDOtec wire, however, the Fe ‒ Si ‒ W ‒ Mn ‒ Cr ‒ C ‒ V system had an elasticity modulus of 125.84 GPa, which indicates its high efficiency under severe mechanical loads. The results obtained confirm the importance of choosing a powder wire depending on the specific requirements for durability and mechanical properties of the deposited coatings.