Subjects -> METALLURGY (Total: 57 journals)
Showing 1 - 10 of 10 Journals sorted alphabetically
Acta Metallurgica Slovaca     Open Access   (Followers: 2)
Advanced Device Materials     Open Access   (Followers: 6)
American Journal of Fluid Dynamics     Open Access   (Followers: 43)
Archives of Metallurgy and Materials     Open Access   (Followers: 9)
Asian Journal of Materials Science     Open Access   (Followers: 4)
Canadian Metallurgical Quarterly     Hybrid Journal   (Followers: 21)
Complex Metals     Open Access   (Followers: 2)
Energy Materials : Materials Science and Engineering for Energy Systems     Hybrid Journal   (Followers: 25)
Graphene and 2D Materials     Open Access   (Followers: 5)
Handbook of Ferromagnetic Materials     Full-text available via subscription   (Followers: 1)
Handbook of Magnetic Materials     Full-text available via subscription   (Followers: 2)
High Temperature Materials and Processes     Open Access   (Followers: 6)
Indian Journal of Engineering and Materials Sciences (IJEMS)     Open Access   (Followers: 11)
International Journal of Metallurgy and Alloys     Full-text available via subscription   (Followers: 1)
International Journal of Metals     Open Access   (Followers: 7)
International Journal of Minerals, Metallurgy, and Materials     Hybrid Journal   (Followers: 11)
International Journal of Mining and Geo-Engineering     Open Access   (Followers: 3)
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 5)
ISIJ International - Iron and Steel Institute of Japan     Full-text available via subscription   (Followers: 26)
Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional’nye Pokrytiya (Proceedings of Higher Schools. Powder Metallurgy аnd Functional Coatings)     Full-text available via subscription   (Followers: 2)
JOM Journal of the Minerals, Metals and Materials Society     Hybrid Journal   (Followers: 35)
Journal of Central South University     Hybrid Journal   (Followers: 1)
Journal of Cluster Science     Hybrid Journal  
Journal of Heavy Metal Toxicity and Diseases     Open Access  
Journal of Iron and Steel Research International     Hybrid Journal   (Followers: 11)
Journal of Materials & Metallurgical Engineering     Full-text available via subscription   (Followers: 2)
Journal of Materials Processing Technology     Hybrid Journal   (Followers: 20)
Journal of Sustainable Metallurgy     Hybrid Journal   (Followers: 4)
Materials Science and Metallurgy Engineering     Open Access   (Followers: 6)
Metal Finishing     Full-text available via subscription   (Followers: 20)
Metallurgical and Materials Engineering     Open Access   (Followers: 7)
Metallurgical and Materials Transactions A     Hybrid Journal   (Followers: 41)
Metallurgical and Materials Transactions B     Hybrid Journal   (Followers: 32)
Metallurgical and Materials Transactions E     Full-text available via subscription   (Followers: 2)
Metallurgical Research and Technology     Full-text available via subscription   (Followers: 8)
Metallurgy and Foundry Engineering     Open Access   (Followers: 1)
Mining, Metallurgy & Exploration     Hybrid Journal  
Powder Diffraction     Full-text available via subscription   (Followers: 1)
Powder Metallurgy     Hybrid Journal   (Followers: 36)
Powder Metallurgy and Metal Ceramics     Hybrid Journal   (Followers: 8)
Powder Metallurgy Progress     Open Access   (Followers: 5)
Practical Metallography     Full-text available via subscription   (Followers: 6)
Rare Metals     Hybrid Journal   (Followers: 2)
Revista de Metalurgia     Open Access  
Revista del Instituto de Investigación de la Facultad de Ingeniería Geológica, Minera, Metalurgica y Geográfica     Open Access  
Revista Remetallica     Open Access  
Revue de Métallurgie     Full-text available via subscription  
Russian Metallurgy (Metally)     Full-text available via subscription   (Followers: 4)
Science and Technology of Welding and Joining     Hybrid Journal   (Followers: 6)
Steel Times lnternational     Partially Free   (Followers: 19)
Transactions of the IMF     Hybrid Journal   (Followers: 14)
Transactions of the Indian Institute of Metals     Hybrid Journal   (Followers: 5)
Tungsten     Hybrid Journal  
Universal Journal of Materials Science     Open Access   (Followers: 3)
Welding in the World     Hybrid Journal   (Followers: 7)
Welding International     Hybrid Journal   (Followers: 11)
Вісник Приазовського Державного Технічного Університету. Серія: Технічні науки     Open Access  
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Russian Metallurgy (Metally)
Journal Prestige (SJR): 0.203
Number of Followers: 4  
 
  Full-text available via subscription Subscription journal
ISSN (Print) 0036-0295 - ISSN (Online) 1555-6255
Published by Springer-Verlag Homepage  [2625 journals]
  • Viscosity of the Samarium and Co–25% Sm–18% Fe–5%
           Cu–3% Zr Alloy Melts
    • Abstract: The kinematic viscosities of the melts of samarium (99.9% Sm) and Co–25% Sm–18% Fe–5% Cu–3% Zr alloy are measured by the oscillating crucible method. The studies have been performed to optimize the parameters of the metallurgical manufacturing of sintered permanent KS25 magnets (Co–25% Sm–18% Fe–5% Cu–3% Zr).
      PubDate: 2020-03-01
       
  • Magnetic Hysteretic Properties of an Fe–25Cr–12Co Powdered
           Hard Magnetic Alloy
    • Abstract: The magnetic hysteretic properties of an Fe–25Cr–12Co powdered hard magnetic alloy have been studied as a function of heat-treatment conditions. The optimization of heat treatment, including thermomagnetic process, and the determination of the optimum magnetic hysteretic properties have been performed using the Statgraphics Centurion XVI software. The following parameters are obtained after the optimum heat treatment: the residual induction is up to Br = 1.425 T, the coercive force is HcB up to 46.45 kA/m, and the maximum energy product is (BH)max = 45.2 kJ/m3. Various optimum heat-treatment conditions are required to achieve the optimum values of Br, HcB, and (BH)max.
      PubDate: 2020-03-01
       
  • Effect of Small Lanthanum Additions on the Structure, the Phase
           Composition, and the Mechanical Properties of a Magnesium ML5pch Alloy in
           the As-Cast and Heat-Treated States
    • Abstract: The effect of small lanthanum additions on the structure and the phase composition of a commercial magnesium cast ML5pch alloy (Mg–Al–Zn–Mn system) in the as-cast and heat-treated states is studied. The addition of lanthanum is found to result in the formation of a new intermetallic Mg17(La,Al)2 phase, to improve the structure of the ML5pch alloy, and to increase its relative elongation and yield strength in the heat-treated state.
      PubDate: 2020-03-01
       
  • Lattice Superdeformation as the Synergy of Two Martensitic Transformations
           in Titanium Nickelide Alloys
    • Abstract: The uniqueness of titanium nickelide alloys consists in the binary B2 → R, B2 → B19) martensitic instability of the isotropically soft B2 lattice and in the synergetic effects induced by the superposition of these two transformations, which form the synergetic B19' lattice with martensitic superdeformation formed in the transformations B2 → R → B19', B2 → B19', and B2 → B19 → B19'. The effects of synergy of the two martensitic transformations are observed during the relay B2 → B19 → B19', and the superdeformation effects are most pronounced at the stage B19 → B19'.
      PubDate: 2020-03-01
       
  • Wear-Resistant Cast Iron Containing Spheroidal Graphite with a Two-Layer
           Ledeburitic–Martensitic Shell
    • Abstract: The structure of a precipitation-hardened composite material, which consists of hard graphite inclusions coated with a two-layer ledeburite–martensite shell and uniformly distributed in a ductile metallic base, forms in the transition layer of high-strength spheroidal graphite cast iron chilled by surface quenching with melting. A process of volume heat treatment is proposed to form this structure in the volume of a product and to increase the abrasive wear resistance, the strength, and the impact toughness.
      PubDate: 2020-03-01
       
  • Effect of a Pulsed Plasma Beam on the Structure and the Phase Composition
           of the Surface Layers in Ferritic–Martensitic Steels
    • Abstract: The structure–phase changes that are caused in the surface layers of ferritic–martensitic Eurofer 97 and 10Cr9WV steel samples by the action of pulsed powerful fluxes of deuterium plasma and deuterium ions, which are generated in a plasma focus (PF) setup, are studied. Before tests, the steels were subjected to standard heat treatment (normalizing, tempering), and the 10Cr9WV steel samples were additionally annealed at 600°C for 600 h to determine the stability of the structure and properties at the temperatures that are close to the operating temperatures. During irradiation, the power densities of plasma (qpl = 107–1010 W/cm2) and ion (qi = 109–1012 W/cm2) fluxes and the number of plasma beam pulses (5–12 at a pulse duration of ~100 ns) are varied. The irradiation of the Eurofer 97 steel at qpl = 108–1010 W/cm2 in the PF setup is shown to cause melting and ultrafast solidification of the surface layer with the subsequent formation of a fine cellular structure with a cell size of 100–150 nm in it. The surface film formed on the 10Cr9WV steel samples during preliminary long-term annealing is found to begin to fail at qpl = 108 W/cm2; this film is fully removed at qpl = 1010 W/cm2. This process is accompanied by the segregation of particles 1–3 μm in size, which are enriched in manganese, chromium, and oxygen. After the surface film is removed, irradiation promotes the removal of manganese from the surface layers, and manganese is also removed from the Eurofer 97 steel, which has no surface film in the initial state. The plasma beam treatment of the Eurofer 97 steel in the PF working chamber at qpl = 108 W/cm2 is found to cause the formation of retained austenite in its structure, and the content of retained austenite in the 10Cr9WV steel subjected to similar treatment is lower than in the Eurofer 97 steel by a factor of 20 because of the presence of a film on its surface. The irradiation of the 10Cr9WV steel at a higher power density (qpl = 1010 W/cm2), when the surface film is removed, equalizes the contents of retained austenite in the steels under study.
      PubDate: 2020-03-01
       
  • Comparison of the Helium Porosity Parameters in Vanadium Alloy TEM Samples
           Prepared by Various Techniques
    • Abstract: The microstructures and the porosity parameters in vanadium alloys irradiated by helium ions are compared after preparing thin films from them for transmission electron microscopy (TEM) by two different techniques. V–1% Ti, V–1% Ta, V–2% Ta, and V–1% Ta–1% W alloy samples are subjected to annealing at 1000°C for 2 h and then to 40-keV helium ion irradiation to a fluence of 5 × 1020 m–2 at a temperature of 650°C. TEM samples are prepared by one-sided electrolytic thinning (ET) on the unirradiated side and by focused ion beam (FIB) cutting normal to the irradiated surface. The microstructures of the foil samples prepared by ET and FIB are shown to be significantly different, which leads to a discrepancy between the calculated porosity parameters and the irradiation-induced swelling. When samples are prepared by ET, the picture substantially depends on the material layer to be fixed, and the layer thickness and position are not controlled. Therefore, the use of ET samples leads increases the error of measuring the porosity parameters, and reproducibility of the results can hardly be reached in this case, which should be taken into account in investigations. Using FIB technique, one can measure the foil thickness in a scanning electron microscope during sample preparation, study the total swelling of the entire irradiated layer, and analyze the distribution of objects over the depth of an irradiated target along ion trajectories.
      PubDate: 2020-03-01
       
  • Effect of Overload on the Near-Threshold Fatigue Crack Growth Rate in a
           2024-T3 Aluminum Alloy: III. Analysis of the Efficiency of the Fatigue
           Crack Growth Models Used to Predict the Fatigue Life under Alternating
           Loading
    • Abstract: The experimental data on the fatigue lives of crack growth that were obtained in tests of aluminum specimens with overloads and underloads in the region of near-threshold crack growth rates are compared. The fatigue crack growth time is predicted using various models, including those embedded in the NASGRO and FASTRAN software packages, in order to reveal the model that is the best for calculating the fatigue life. The results obtained are compared with the prediction of a proposed combined model, which takes into account crack closure and the local stresses in the crack mouth and is based on the Neuber and Ramberg–Osgood equations. The efficiencies of the existing and proposed models used to describe the growth of fatigue cracks during random loading are estimated.
      PubDate: 2020-03-01
       
  • Electromagnetic Device for Nondestructive Control of the Mechanical
           Properties of Thin-Walled Steel Vessels
    • Abstract: An electromagnetic device is developed for nondestructive control of the mechanical properties of the thin-walled steel vessels supplied from a rolling–pressing line. The microstructures and the physicomechanical properties of two groups of vessels made of grade 50 steel are studied. The relation between the signal at the output of the control device and the mechanical properties of the thin-walled steel vessels is found. A linear regression equation is derived to determine the hardness of grade 50 steel using the electromotive force in the inductance coil of the electromagnetic device for controlling the mechanical properties of the vessels. This device was tested in controlling the mechanical properties of thin-walled steel vessels from two batches subjected to quenching and heat treatment under various conditions in the rolling–pressing line of AO NPO Pribor.
      PubDate: 2020-03-01
       
  • Effect of the Conditions of Annealing of a Pr–Dy–Fe–Co–B Alloy on
           the Properties of the Sintered Magnets
    • Abstract: Annealing of a (Pr0.53Dy0.47)12(Fe0.77Co0.23)80B8 (at %) alloy is found to affect the magnetic properties of the sintered magnets fabricated from the alloy. Annealing of the alloy is shown to lead to a 8% increase in the remanence and to nonmonotonic variations of the coercive force by 10–12%. The detected 4% decrease in the dysprosium content in the main magnetic phase and 1% increase in the phase content in the sintered magnet can favor an increase in the residual magnetization. Annealing of the alloy does not lead to changes in the temperature coefficient of induction of the sintered magnets. The diffusion of dysprosium is the most probable cause for the detected changes.
      PubDate: 2020-03-01
       
  • Development of a Low-Temperature Bloomery Process for Nickel and Cobalt
           Recovery from Saprolite Ores
    • Abstract: The bloomery process in rotary kilns is used for reducing roasting of high-magnesia saprolite ores at relatively low temperatures (1200–1225°C). The influence of flux (limestone, bauxite, fluorite) and sulfur-containing (pyrite concentrate, elementary sulfur, gypsum) additives on the temperature of coarsening of metallic particles with the formation of coarse ferronickel grains is studied at a reducing roasting time of 30 min. The optimum charge composition is determined, and the simultaneous introduction of 2–3% CaF2 and 0.8–1.2% (based on sulfur) sulfur-containing additive into a charge at the optimum limestone and bauxite additives is shown to decrease the temperature of coarsening of metallic particles to 1200–1225°C. In this case, aggregates of metallic ferronickel grains bound by a sulfide phase form. According to electron-probe microanalysis data, 90–92% nickel concentrate in a metallic phase, 4–5% concentrate in a sulfide phase, and 4–6% nickel is retained in a slag. The accumulation of a sulfide phase as a binder between metallic grains and the presence of magnetic properties in both phases substantially facilitate their extraction into a magnetic phase during separation with high indices of nickel and cobalt recovery. The formation of metallic grain aggregates and a sulfide phase create favorable conditions for further processing of the magnetic product by high-pressure sulfuric acid leaching or a carbonyl method to produce called-for products (nickel sulfate, high-purity metallic powders).
      PubDate: 2020-03-01
       
  • Mechanism and Kinetics of the Carbothermic Reduction of Metals in the
           FeS–Ni 3 S 2 –CaO System
    • Abstract: The reduction of metals by carbon and carbon monoxide in the FeS–Ni3S2–CaO system on continuous heating to 1250°C is studied using thermogravimetric and differential thermal analyses combined with mass spectrometry of gases. The formation of the oxysulfides CaFeSO and Ca3Fe4S3O6 along with sulfide phases is revealed in the FeS–CaO and FeS–Ni3S2–CaO systems on heating in an inert atmosphere. The chemism of the carbothermic reduction of sulfides FeS, Ni3S2, and Fe4.5Ni4.5S8 in a mixture with calcium oxide is determined. The reduction products are shown to be calcium sulfide and metals, and an additive of calcium oxide inhibits the evolution of sulfur-containing gases. The reduction of nickel sulfide by carbon and carbon monoxide is activated if iron sulfide is introduced into a reaction mixture along with calcium oxide. Iron sulfide favors the formation of intermediate iron–calcium oxysulfides with enhanced reactivity. In the temperature range from 750 to 1170°C, the experimental data on the carbothermic reduction of metals in the FeS‒Ni3S2–CaO system are described by a one-step Avrami–Erofeev model, in which the process is determined by the step of nuclei formation and growth. The kinetic parameters of the process are found to be E = 520 kJ/mol, log A = 18.2 s–1, and n = 0.87 (E is the activation energy, A is the preexponential factor, and n is the reaction order). The data obtained are useful for the development of technologies for the direct isolation of valuable metals from sulfide raw materials.
      PubDate: 2020-03-01
       
  • Effect of the Annealing Temperature on the Aging-Induced Recovery in
           Magnesium Alloys with Rare-Earth Metals
    • Abstract: The possibility of recovery in binary magnesium alloys with the yttrium group rare-earth metals (Y, Gd, Tb, Dy, Ho), in which the decomposition of a supersaturated magnesium solid solution at 200°C is accompanied by substantial hardening, is studied at an annealing temperature of 300°C. Annealing at 300°C of the alloys aged at 200°C to the state with the highest hardness results in significant recovery, which is much higher than the established recovery of these alloys at an annealing temperature of 250°C. The recovery regularly changes as a function of the atomic number of a rare-earth metal. Structural analysis of the alloys suggests that the phases formed in them during hardening aging are partly retained during the subsequent recovery, and no new phases form.
      PubDate: 2020-03-01
       
  • Structure and Mechanical Properties in the Submicrovolumes of Sintered
           KS25 (Co–Sm) Permanent Magnets
    • Abstract: The microstructure and the mechanical properties of the submicrovolumes in the rare-earth magnets KS25 sintered from a Co–25% Sm alloy is studied. The microstructure is studied by optical, electron, and atomic force microscopy. The microstructure is found to be characterized by the presence of SmCo5 dendrites, the interdendritic space consisting of a mixture of the SmCo5 and Sm2Co17 phases, individual Sm2Co17-phase grains, Zr5Co3FeSm compound crystals (1–5 μm in size), and globular Sm2O3 samarium oxide inclusions (2–10 μm in size). The hardness H (GPa) and Young’s modulus E (GPa) of the main Sm2Co17 and SmCo5 phases are determined by nanoindentation. The machinability of the magnets is estimated using the nanoindentation data; the additional pressure and adhesion at the boundary of the Sm2Co17 and SmCo5 phases are calculated. The calculation shows that the additional pressure exceeds the external pressure by a factor of 300, and the adhesion of the phases (Kint = 0.543 MPa m0.5) is lower than that of the strengthening coatings by an order of magnitude. This finding can be the cause of magnet cracking along the boundary between the Sm2Co17 and SmCo5 phases during cutting and grinding.
      PubDate: 2020-03-01
       
  • Computer Simulation of the Initial Stages of Electrocrystallization during
           Cyclic Potential Sweep
    • Abstract: The multiple formation and the diffusion-controlled growth of noninteracting clusters of a new phase under cyclic potential sweep are numerically simulated. The factors influencing the shape of nucleation loops are analyzed. The possible application of the mathematical model for an analysis of the nucleation/growth processes is discussed.
      PubDate: 2020-02-01
       
  • Character of Selective Anodic Dissolution. Influence of the Alloy
           Composition
    • Abstract: The corrosion electrochemical behavior of copper-based alloys (L63, cupronickel, Monel, Cu–Al) in high-temperature salt electrolytes of various compositions in the galvanostatic mode is studied. Brass L63 is the most promising copper-based alloy for the production of nanoporous and mesoporous materials in salt melts. L63 brass samples have the smallest average pore diameter in experiments with a chloride melt. The pore size was 1.1 μm in the galvanostatic mode under the specified conditions (200 A/m2, 500°C). The results of cyclic voltammetry can be applied to predict the character of electrochemical destruction and to analyze the stages of conjugated anodic processes. The influence of the nature of the second alloy component on the character of electrochemical destruction and the formation of the developed surface layer of the alloys is found.
      PubDate: 2020-02-01
       
  • Separation Factors of La/U, Pr/U, and Nd/U in the
           Ga–In/3LiCl–2KCl Molten System
    • Abstract: The separation of lanthanides and actinides can be successfully used in the liquid metal–molten salt system. The separation factors of lanthanum, praseodymium, and neodymium from uranium have been calculated at various temperatures in the molten Me(Ga–In)/3LiCl–2KCl system. The effect of the nature of lanthanide on the separation factor of the Ln/U couple is established.
      PubDate: 2020-02-01
       
  • Experimental Studies of the Dynamic Formation of the Side Ledge in an
           Aluminum Electrolysis Cell
    • Abstract: An experimental setup is created to study the dynamic behavior of the side ledge under the electrolysis in a cryolite-alumina electrolyte. The installation has a built-in window on the side panel, which allows the lining material and, hence, the heat flow to be varied. The dynamic formation of a side ledge is experimentally studied as a function of temperature, the electrolyte velocity, and the heat flow during the electrolysis of aluminum. The rate of the ledge formation and the ledge thickness are determined by the heat flow caused by the electrolyte temperature, the cell side temperature, and the liquidus temperature. As in an industrial electrolysis cell, the side ledge profile formed in the experimental cell can be conventionally divided into the following three zones: the ledge at the bottom in contact with liquid aluminum, the ledge at metal/electrolyte interface, and the ledge at the electrolyte level. If the temperature of the inner wall is higher than the liquidus temperature, the side ledge does not form; if it is lower, the side ledge forms until these temperatures become the same. Therefore, the stability of the side ledge depends on the heat flow from the center to the walls; however, the dynamic behavior (solidification/melting) of the ledge in the metal zone occurs slowly and differs from the behavior of the side ledge.
      PubDate: 2020-02-01
       
  • Study of the Slag of Cyclone Smelting to Choose the Direction of Its
           Further Use
    • Abstract: A granulated slag, which goes to a dump, forms in the metallurgical enterprise near Novoshakhtinsk (Primorye Territory, Far East) upon processing of the germanium-containing raw materials of the Pavlovsk brown coal deposit. The reclamation of this technical waste needs an energy efficient ecologically safe method that meets the requirements of ecological norms. According to modern requirements, the problem of reclamation of the slag of cyclone smelting should be solved before the beginning of operation of the enterprise. The project documentation recommends using the slag of cyclone smelting in building or the production of building materials. The chemical and granulometric compositions of the slag and the properties of the material during interaction with water should be determined to find the direction of reclamation of the slag of cyclone smelting. Using reduction-sulfidizing cyclone smelting with flux and sulfidizer additives, we formed a granulated slag, the properties of which are close to those of the commercial slag of cyclone smelting, under laboratory conditions. Samples are prepared for a further investigation. Using modern experimental techniques, we determined the composition and properties of the slag and performed chemical analysis to find macrocomponent contents and X-ray diffraction analysis for an ecological estimation. The physicochemical and organoleptic characteristics of the slag are determined according to the existing standards. For example, the maximum particle size in the slag is 10 mm and the content of the particles the size of which is more than 5 mm is 9.7%, which corresponds to GOST 5578–94. The density and humidity of the slag are determined. The solution that forms during interaction with water has a weak alkaline reaction, which does not prevent the use of the material in an industrial process. The slag is shown to be suitable for further reclamation.
      PubDate: 2020-02-01
       
  • Interfacial Distribution of Germanium during the Interaction of Metallic
           and Slag Melts
    • Abstract: The behavior of elements in the high-temperature processes that involve several melts and a gas phases is mainly determined by the rate of interfacial transport of an element. For example, the efficiency of processing of germanium-containing raw materials is determined by the rate of sublimation of gaseous germanium compounds (GeO, GeS) or the reduction of elementary germanium from a silicate melt (slag) in an iron-based melt, depending on the method germanium concentration in a gas or metallic phase [1, 2]. The rate of germanium transfer to a metallic melt should be decreased in the former case and should be increased in the latter case. Since the rates of germanium transport from a slag to a metal are unavailable, we try to measure the rate of germanium exchange between silicate and metallic (iron-based) melts.
      PubDate: 2020-02-01
       
 
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