Journal of Metallic Material Research
EISSN : 2630-5135
Current Publisher: Bilingual Publishing Co. (10.30564)
Total articles ≅ 29
Latest articles in this journal
Journal of Metallic Material Research, Volume 3; doi:10.30564/jmmr.v3i2.2374
The electrons of metallic iron atoms all have wave-particle duality, The electrons of each iron atom are particles in the liquid state, the solid state is fluctuating. the wave-particle duality parameters of each iron atom electron are different, there is a small difference, the same is gathered into one, become a single grain.The parameters of wave-particle duality are different,The crystallization temperature of liquid state is different from that of solid state.
Journal of Metallic Material Research, Volume 3; doi:10.30564/jmmr.v3i2.2400
The research work was based on the study of the corrosion behaviour of the welded and un-welded medium carbon steel in sodium chloride solutions. The Sodium chloride solutions used are 1ml, 2ml, 3ml and 4ml for both welded and un-welded medium carbon steel in NaCl. The experiments were conducted in two ways, the weight loss analyses of measurements and using the electrochemical analyzer workstation to determine the potential dynamic of the samples. The samples for the weight loss measurements were prepared from rolled products obtained at the foundry shop. Two medium carbon steel materials were sourced with different chemical compositions as sample A and B. The materials were prepared to accommodate the experiments for the determination of welded and un-welded medium carbon steel. A total of sixty-eight (68) samples were produced, prepared and used for the weight loss measurements /analyses the experiments. Thirty-four of the samples each were prepared for both the welded and un-welded experiments. All the samples were produced and prepared through the use of various machining processes with the use of a lathe machine for planning, milling. Thirty-four (34) of the sample preparation were further welded in readiness of the experiments. Sixty –eight breakers were sourced for and used. Ten (10) other samples were used for the determination with the use of the electrochemical analyzer. The chemical compositions of the medium carbon steel were determined with the use of SPECTRO Analytical Instruments. A metallurgical inverted optical microscope was used to determine the microstructures of the materials. The Scanning Electron Microscopy with EDS was used to determine the morphologies of the materials. The thirty-four of the samples were welded this process was performed to determine the effects of welding on the material surrounding the weldments. These materials were made into sizes with the use of power hacksaw (i.e. 2cm by 2cm). Other materials were prepared to 1cm x 1cm thickness from the same materials. The Tafel plot experiments and that of the open Circuit Potential Time (OCPT) were carried out with the use of Electrochemical Analyzer/ Workstation. The Medium carbon steel materials were exposed for fifty – four (54) days, with an interval of 3days. The corrosion rates analyses were determined and the graphs of the corrosion rates (mm/yr.) and other parameters were used plotted against No of days exposed.
Journal of Metallic Material Research, Volume 3; doi:10.30564/jmmr.v3i2.2403
Chloride ions interact with aluminium in marine atmosphere to form corrosion cell. Due to this corrosion reaction occurs on their surface, aluminium is oxidized into Al3+. The corrosion reaction accelerates deterioration in metal and it produces galvanic, pitting, stress, crevice, intergranular corrosion. Chloride ions decrease internal and external strength of aluminium metal. It is a very important metal so used in different appliances for e.g. road, water, air transports, housing, railways and other fields. Nanocoating and electrospray techniques used to check the corrosion of aluminium metal. For nanocoating and electrospray materials applied tetrahydro-dibenzo[a,d]annulene-5,11-dihydrazone and MgO. Both materials formed composite barrier and developed a passive surface for Cl- ions. This barrier reduced the corrosion rate of aluminium. Nozzle spray and chemical vapour deposition technique used for coating process. The corrosion rate of metal was determined by gravimetric method. Corrosion potential and current density were calculated by potentiostat. The composite barrier formation was confirmed by activation energy, heat of adsorption, free energy, enthalpy and entropy. These thermal parameters were obtained by Arrhenius equation, Langmuir isotherm and Transition state equation. The adsorption of tetrahydro-dibenzo[a,d]annulene-5,11-dihydrazone and MgO electrospray on aluminium surface was depicted by Langmuir, Frundlich and Temkin isotherm. The results of surface coverage area and coating efficiency were noticed that both materials were mitigated the corrosion rate of aluminium in chloride ions environment.
Journal of Metallic Material Research, Volume 3; doi:10.30564/jmmr.v3i2.2441
The results of the study of oscillograms of voltage, current, pulsed electric power and energy input into the plasma of an overstressed nanosecond discharge between aluminum electrodes in argon and mixtures of nitrogen with oxygen (100-1) at pressures in the range of 13.3-103.3 kPa are presented, the emission plasma spectra are studied. It is shown that in mixtures of nitrogen with oxygen at atmospheric pressure, nanoparticles of aluminum oxide (Al2O3) are formed, the luminescence of which manifests itself in the spectral range of 200-600 nm and which is associated with the formation of F-, F + - centers and more complex aggregate formations based on oxygen vacancies. Calculations of the electron-kinetic coefficients of plasma, transport characteristics, such as mean electron energies in the range 5.116-13.41 eV, are given. The electron concentration was 1.6 ∙ 1020 m-3 - 1.1 ∙ 1020 m-3 at a current density of 5.1 ∙ 106 A / m2 and l. 02 ∙ 107 A / m2 on the surface of the electrode of the radiation source (0.196 · 10-4 m2). Also drift velocities, temperatures and concentrations of electrons, specific losses of the discharge power for elastic and inelastic processes of collisions of electrons per unit of the total concentration of the mixture from the reduced electric field strength (E / N) for a mixture of aluminum, nitrogen, oxygen, rate constants of collisions of electrons with aluminum atoms on the E / N parameter in plasma on a mixture of aluminum vapor, oxygen and nitrogen = 30: 1000: 100000 Pa at a total mixture pressure of P = 101030 Pa are given.
Journal of Metallic Material Research, Volume 3; doi:10.30564/jmmr.v3i2.2409
Bulk raw materials handling plant and sintering plant preparatory plants are established to receive, blend, stockpile, prepare and supply specified grades of raw materials for smooth operations of iron making plant (Blast furnace), steel making plant (Basic oxygen converter) and lime Plant(calcinations plant). The study discusses bulk raw materials handling and some general problem of scientific analysis and documentation of basic equipment details, stockyard facilities, bulk materials transport systems and sinter processes, for the general knowledge and operational procedures of these plant for effective and efficient operational processes for optical results. Iron ore concentrate supplied from the mines to some extent fluctuate in their chemical composition as a result of the nature of the deposit with various factors controlling beneficiation processes and addition of metal-bearing materials collected as a waste product from the Rolling Mills, Blast Furnace and Sinter Plant which must be recycled through Iron ore concentrate stockyard. The part of the sinter mixture is melted at a temperature about 1300-1480 ° C and a sequence of reactions shaping the sinter cake to be loaded into the blast furnace to produce iron from a pig.
Journal of Metallic Material Research, Volume 3; doi:10.30564/jmmr.v3i1.1364
The influence of deposition modes on the phase-structural state, corrosion resistance, and adhesive strength of vacuum-arc multi-period NbN/Cu coatings is studied. It was found that in thin layers (about 8 nm, in a constant rotation mode), regardless of the change in the pressure of the nitrogen atmosphere, a metastable δ - NbN phase forms (cubic crystal lattice of the NaCl type). At a layer thickness of ~ 40 nm or more, a phase composition changes from the metastable δ - NbN to the equilibrium ε - NbN phase with a hexagonal crystal lattice. In the presence of the ε - NbN phase in the niobium nitride layers, the highest adhesive strength is achieved with a value of LС5 = 96.5 N. Corrosion resistance tests have shown that for all the studied samples the corrosion process has mainly an anodic reaction. The highest corrosion resistance was shown by coatings obtained at a pressure of 7·10-4 Torr, with the smallest bias potential of -50 V and the smallest layer thickness; with a thickness of such a coating of about 10 microns, its service life in the environment of the formation of chloride ions is about a year.
Journal of Metallic Material Research, Volume 3; doi:10.30564/jmmr.v3i1.1753
Magnesium (Mg) alloy is the lightest metal material found because of its excellent physical and mechanical properties, specific strength, biocompatibility and biomechanical compatibility, therefore, it has very promising development prospects in aerospace, automobile manufacturing, and biodegradable materials. However, due to the relatively chemical properties of magnesium alloys, poor corrosion resistance, fast degradation rate, and poor wear resistance, they have been greatly restricted in practical applications. Therefore, anti-corrosion measures of magnesium alloys are particularly important. The manufacture of hydrophobic surfaces is a very effective method of anti-corrosion. The surface of super-hydrophobic polymer composites (i.e., thin coatings) is constructed on the surface of magnesium alloy materials to enhance their corrosion resistance and wear resistance, and the effect of its antiseptic measures is very impressive.
Journal of Metallic Material Research, Volume 3; doi:10.30564/jmmr.v3i1.920
This paper covers the role of anisotropy, temperature, and strain rate on the flow behavior of the material when a conical die is used instead of conventional blank holder. The effect of anisotropy was investigated using Lankford’s coefficient (r) in three directions (0°, 45°, and 90°). The effect of working temperatures (Room temperature, 100°C - 300°C) on drawing stress and strain rate sensitivity on punch pressure were also investigated in detail. ANSYS APDL was used to investigate the effects of temperature, strain rate and anisotropy. The simulation results have confirmed that the strain variation in the direction of r0 and r45 are more than the variation of r90.
Journal of Metallic Material Research, Volume 3; doi:10.30564/jmmr.v3i1.1757
According to LNƐ、theoretical & true elongation of tensile, and by adopting the increasing function of formulas with the derivation and analogy methods, the the elongation formula of 0<(1+ε)1/ε1 and 0<ε LNε are deduced too if ε>1 and 0<ε1 and 0<ε
Journal of Metallic Material Research, Volume 2; doi:10.30564/jmmr.v2i2.1124
In the present investigation a series of MoO3-Fe3O4 nanocomposite material such as MoO3, Fe3O4, Beta cyclodextrin (b-CD) doped MoO3-Fe3O4 and Graphite doped MoO3-Fe3O4 have been synthesized successfully by co-precipitation method. Synthesized nanomaterials were characterized in detail by XRD, FT-IR, TEM-HRTEM, UV-Vis DRS techniques. The crystalline size was in the range of 10±2 nm. The activity of the prepared material as a heterogeneous catalyst was successfully tested on the organic reaction of synthesis of substituted m-Chloro-Nitrobenzene and it was found to give excellent yield.