EFFECT OF THE STRUCTURE FORMED AFTER BULKAND SURFACE HARDENING ON THE HARDNESSAND WEAR RESISTANCE OF 20Cr2Ni4A STEEL

Abstract

The article presents the results of a comparative study of the effect of bulk and surface hardening on the structure and properties of 20Cr2Ni4A steel. Surface hardening was carried out by the electrolytic plasma method. Bulk quenching was carried out by heating to a temperature of 870 °C, followed by cooling in water and oil. The structural-phase states of20Cr2Ni4A steel samples were studied by metallographic and X-ray structural analysis. Tribological tests of the samples were carried out according to the ball-disk scheme, and the microhardness of the samples was also determined. It has been determined that after volumetric and surface hardening, the hardness and wear resistance of 20Cr2Ni4A steel increase. In this case, the most significant change is observed in samples that have undergone electrolytic plasma hardening. It has been established that high values of hardness and wear resistance of 20Cr2Ni4A steel after electrolytic plasma hardening are associated with the formation of fine-needle martensite

Fluence of Phase Formation Processes in Lithium Zirconateceramics on Strengthand Thermal Properties

“…One such way is to reproduce the classical nuclear reaction of the 6 Li + n → He + T type, which makes it possible to obtain tritium from lithium, with its subsequent accumulation to support thermonuclear fusion. At the same time, as shown in a number of scientific papers [6][7][8][9][10], the tritium production is usually accompanied by the release of helium and other products of nuclear reactions, which leads to the material degradation, as well as a decrease in its resistance to external influences and a deterioration in strength properties.…”