The Effect of Nickel on the Viscosity of Iron‐Based Multicomponent Melts

In this work, we investigated the temperature dependence of the kinematic viscosity of multicomponent Fe72.5‐xNixCu1Nb2Mo1.5Si14B9 melts with a Ni content of up to 12.7 at. %. The peculiarities of the temperature dependence of Ni‐containing melts were explained by the tendency of Ni atoms to surface segregation. Ni atoms are concentrated near the interfaces of the liquid and solid phases in the mushy zone at the stage of melting and restrain the melting of the solid phase. With increasing Ni content, the Arrhenius type of viscous flow begins at a higher temperature. Ni atoms are concentrated at the periphery of clusters, increasing their size and decreasing their mobility. The movement of Ni‐containing clusters increases the activation energy and decreases the kinematic viscosity. The change in the activation energy at a temperature of about 1700 K was associated with a liquid–liquid structure transition (LLST). This structural transition is reversible since it is observed both at the heating and cooling stages. The increase in kinematic viscosity at temperatures above 1900 K was associated with the decomposition of high‐temperature clusters based on cementite and silicon oxides. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.The article was made within the framework of state work No. FEUZ-0836-0020

Viscosity of Melchior Alloy Mark MN19

The temperature dependences of the kinematic viscosity of melchior alloy mark MN19 are investigated. On the basis of the obtained experimental data, the following recommendations were given: the minimum heating to a temperature of 1400 ◦С, an extract≈5 min. to homogenize the melt.Исследованы температурные зависимости кинематической вязкости мельхиора марки МН19. На основании полученных экспериментальных данных предложены следующие рекомендации: минимальный нагрев до температуры 1400 ◦С, выдержка ≈ 5 мин для гомогенизации расплава

Optimum regime of heat treatment of soft magnetic amorphous materials

The influence of Fe 72.5 Cu 1 Nb 2 Mo 1.5 Si 14 B 9 nanocrystalline alloy annealing temperature on the structure and magnetic properties has been investigated. The heat treatment temperature of nanocrystalline soft magnetic alloy Fe 72.5Cu 1Nb 2Mo 1.5Si 14B 9, which allows reaching the maximum value of the initial magnetic permeability, was found to be 15-20° higher than that ensuring the minimum coercive force. The relation between the numerical values of the coercive force, the initial magnetic permeability and the magnetic hysteresis loop rectangularity factor allows optimizing the mode of nanocrystalline alloy heat treatment. © 2006 IEEE

Influence of the production method on the viscosity of liquid 100Γ13X2Lcyrillic steel

Viscosimetric data are derived for liquid 100Gcyrillic13X2Lcyrillic steel during the heating and subsequent cooling of samples. The samples are taken from ingots produced by different methods: by oxidation and by remelting. On the basis of the experimental temperature and time dependences of the liquid steel's kinematic viscosity, the optimal melt treatment prior to solidification is identified. © 2013 Allerton Press, Inc

The Effect of Nickel on the Viscosity of Iron-Based Multicomponent Melts

In this work, we investigated the temperature dependence of the kinematic viscosity of multicomponent Fe72.5−xNixCu1Nb2Mo1.5Si14B9 melts with a Ni content of up to 12.7 at. %. The peculiarities of the temperature dependence of Ni-containing melts were explained by the tendency of Ni atoms to surface segregation. Ni atoms are concentrated near the interfaces of the liquid and solid phases in the mushy zone at the stage of melting and restrain the melting of the solid phase. With increasing Ni content, the Arrhenius type of viscous flow begins at a higher temperature. Ni atoms are concentrated at the periphery of clusters, increasing their size and decreasing their mobility. The movement of Ni-containing clusters increases the activation energy and decreases the kinematic viscosity. The change in the activation energy at a temperature of about 1700 K was associated with a liquid-liquid structure transition (LLST). This structural transition is reversible since it is observed both at the heating and cooling stages. The increase in kinematic viscosity at temperatures above 1900 K was associated with the decomposition of high-temperature clusters based on cementite and silicon oxides

DEVICE FOR DETERMINING SMOKE FORMATION IN A LABORATORY ELECTRIC FURNACE

FIELD: physics. SUBSTANCE: nvention relates to engineering physics, particularly to determination of parameters of metal melts. Smoke detecting device in laboratory electric furnace, which is part of water-cooled vacuum furnace, filled with inert gas, comprises electric furnace branch pipe, vacuum hose and pump, smoke detector, which comprises at least one photosensor, the output of which is connected to a communication channel, the output of which is connected to the computer, the transparent tubular element on which the smoke detector is placed, is located between the vacuum hose and the electric furnace branch pipe. EFFECT: technical result is possibility of functioning and preservation of objectivity of assessment of smoke optical characteristics when studying sample without damage of smoke detector.Изобретение относится к технической физике, в частности к определению параметров металлических расплавов. Устройство определения задымления в лабораторной электропечи, входящее в состав водоохлаждаемой вакуумной электропечи, заполненной инертным газом, содержит патрубок электропечи, вакуумные шланг и насос, датчик задымления, который содержит, по меньшей мере, один фотосенсор, выход которого подключен к каналу связи, выход которого соединен с компьютером, прозрачный трубчатый элемент, на котором размещен датчик задымления, расположен между вакуумным шлангом и патрубком электропечи. Техническим результатом является возможность функционирования и сохранения объективности оценки оптических характеристик задымления при изучении образца без повреждения датчика задымления