STUDY OF THE INFLUENCE OF VANADIUM MICROALLOYING ON THE STRUCTURE AND MECHANICAL PROPERTIES OF STRUCTURAL STEEL 10ХСНД (10KhSND) AND WELDED JOINTS ON ITS BASIS

The results of research of vanadium microalloying effect on mechanical properties, structure and hardness of low-alloyed structural steel 10ХСНД (10KhSND) and а welded joint on its basis are presented. It is shown that vanadium microalloying of the steel leads to an increase in the average value of strength limit and yield strength, insignificant increase in relative elongation, impact strength, as well as a change in the course of the tensile curve. At the same time, a significant increase in the impact strength of samples of welded joints made of 10KhSND steel, microalloyed with vanadium, and their microhardness compared with welded samples made of 10KhSND steel in serial version is recorded. There were no changes in the microstructure of both solid and welded samples due to vanadium microalloying.