The effect of the selective laser melting mode on second phases precipitation in 316L steel during subsequent heat treatment

The object of the study was 316L steel obtained by the method of selective laser melting (SLM). The structure of 316L steel was investigated after different SLM modes. The effect of different SLM modes on the second phases precipitation after heat treatment was studied. It is revealed that the fraction of precipitates of the χ-phase correlates with the energy density of the laser beam during SLM. © 2021 Institute of Physics Publishing. All rights reserved

Mythologem of twins as a way to regenerate ethnic self-identification

The article investigates the interpretation and perception of twin mythologem in Old Russian literature comparative qualitative research methods. As a result, The mythologem of twins is one of important archetypal images. In this research, the twin mythologem is understood here as a regenerating agent for ethnic self-identification that becomes especially important during critical (bifurcation) periods in Russian history. In conclusion, the variants of twin mythologem discussed here combine the meanings of growth, regeneration, cultural heroes, the sacral upper part of the world, self-sacrific

Identification of the second phases formed in VDM® alloy C-4

The electrochemical extraction of the second phase in the VDM® alloy C-4 alloy has been studied by transmission and scanning microscopy, as well as by X-ray phase analysis. It was found that annealing, which consists in heating up to 850 ℃ with further holding for 32 hours and cooling in a furnace, leads to the precipitation of a second phase in VDM® alloy C-4 alloy. It can lead to embrittlement and a general decrease in the corrosion resistance of the alloy. The precipitation of the anode deposit (the second phase in the samples of the VDM® alloy C-4 alloy after annealing) and its identification was carried out by the methods indicated above. © 2021 Institute of Physics Publishing. All rights reserved

Formation of bacterial biofilms on the surface of titanium and titanium with a diamond-like carbon coating

The aim of the study – to evaluate the antibacterial properties and the ability of the diamond-like carbon (DLC) coating of titanium plates for arthroplasty to suppress the formation of microbial biofilms.Цель исследования – оценить антибактериальные свойства и способность алмазоподобного углеродного покрытия титановых пластин для эндопротезирования подавлять образование микробных биопленок

Effect of Electronic Beam Melting Mode on the Structure of Inconel 718 Alloy

Влияние различных режимов электронно-лучевого сплавления (ЭЛС) на структуру сплава Inconel 718 было изучено с помощью просвечивающей и растровой электронной микроскопии, а также рентгеноструктурного фазового анализа. Установлено, что режим электронно-лучевого сплавления влияет на параметры структуры сплава Inconel 718. Определён фазовый состав сплава после разных режимов ЭЛС. Показано, что твердость сплава Inconel 718 коррелирует с плотностью энергии режима ЭЛС.The effect of various modes of electronic beam melting (EBM) on the structure of the Inconel 718 alloy was studied using transmission and scanning electron microscopy, as well as X-ray phase analysis. It is established that the mode of electronic beam melting affects the parameters of the structure of the Inconel 718 alloy. The phase composition of the alloy after different modes of ELS is determined. It is shown that the hardness of the Inconel 718 alloy correlates with the energy density of the ELS mode

THE KINETICS OF AUSTENITE FORMATION IN THE STEEL 08Г2Б WITH DIFFERENT INITIAL STRUCTURE

Samples of low-carbon pipe steel 08G2B after control rolling, normalization and quenching were investigated. The kinetics of the austenite formation under conditions of continuous heating with rate 90 оС/с and during isothermal soaking in the inter-critical temperature range were analyzed. The critical points Ac1 and Ac3, the activation energy of the austenite formation have been determined.В работе исследованы образцы низкоуглеродистой трубной стали 08Г2Б после контролируемой прокатки, нормализации и закалки. Проведен анализ кинетики образования аустенита в условиях непрерывного нагрева со скоростью 90 оС/с и в ходе изотермической выдержки в межкритическом интервале температур. Определены критические точки АС1 и АС3, найдена энергия активации образования аустенита

TECHNIQUE FOR DETERMINATION OF THE MAIN ELEMENTS AND IMPURITIES IN FERROVANADIUM ALLOYS BY X-RAY FLUORESCENCE ANALYSIS

The technique for determining the content of the main and impurity components in ferrovanadium was developed, considering particle size distribution of samples. The obtained technique is rapid and can be used for the intermediate control of ferrovanadium ingots

INFLUENCE OF GRAIN BOUNDARY TYPE ON CORROSION RESISTANCE OF NICKEL-BASED ALLOY HN62M

В статье приведен обзор влияния типа межкристаллитных границ на протекание межкристаллитной коррозии в никелевом жаропрочном сплаве ХН62М в расплаве солей LiCl-KCl. Проанализировано влияние термообработки и деформации на структуру сплава ХН62М, на количество специальных границ и их коррозионную стойкость. Показано, что после коррозионных испытаний в среде солей LiCl-KCl при 650 ℃ в течение 100 часов выделяются частицы второй фазы по границам зерен с повышенным содержанием в ней Mo. Были выявлены зависимости изменения количества растравившихся границ и скорости коррозии от количества границ специального типа.The article provides an overview of the effect of the type of intercrystalline boundaries on the occurrence of intercrystalline corrosion in the nickel heat-resistant alloy KHN62M in the melt of LiCl-KCl salts. The influence of heat treatment and deformation on the structure of the KHN62M alloy, on the number of special boundaries and their corrosion resistance is analyzed. It is shown that after corrosion tests in the medium of LiCl-KCl salts at 650 ℃, particles of the second phase are released along the grain boundaries with an increased Mo content in it for 100 hours. The dependences of the change in the number of strained boundaries and the rate of corrosion on the number of boundaries of a special type were revealed

INVESTIGATION OF MECHANISMS OF ORDERING IN ALLOY Ti‑17Al

The processes of formation of the ordered phase of Ti3Al (α2‑phase) in the Ti–Al system alloy are investigated as function of the heat treatment.Исследованы процессы образования упорядоченной фазы Ti3Al (α2‑фазы) в сплаве системы Ti–Al в зависимости от режима термической обработки.Исследование выполнено за счет гранта Российского научного фонда (проект № 18-13-00220)

CORROSION RESISTANCE OF SILICON CARBIDE IN MOLTEN FLINAK BASED SALTS

The corrosion resistance of silicon carbide obtained by hot pressing (HP SiC), sintering (SSiC) and reaction sintering (SiSiC) methods was investigated. Specimens were exposed in fused FLiNaK mixture, containing UF4, CeF3, NdF3, Te. The mechanism of corrosion pro-cesses was determined and described.Данная работа выполнена при финансовой поддержке Госкорпораии “Росатом” (ГК № Н.4щ.241.09.20.1101)