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Journal of Metallurgical Engineering
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  This is an Open Access Journal Open Access journal
     ISSN (Print) 2168-555X - ISSN (Online) 2168-5568
     Published by Science and Engineering Publishing Company Homepage  [48 journals]
  • Suitability of Steel Slag as a Refractory Material

    • Abstract: Suitability of Steel Slag as a Refractory Material
      Pages 119-125
      Author Bodude M.AObidiegwu E.OEsezobor D.
      In an attempt to determine the suitability of steel slag as a refractory material, steel slag was crushed, ground and mixed with 10% silica sand. The mixture was divided into three portions and each portion was mixed with different binders namely; clay, bentonite and boric acid respectively at different percentages with water. The effective mixture were pressed using a hydraulic pressing machine. The samples were dried, fired and tested for cold crushing strength, permeability, fired shrinkage, apparent porosity, moisture content and loss on ignition. The investigation showed that the thermal shock cycle decreases with increase in percentage composition of boric acid while that of percentage increase in clay and bentonite remains constant even after 30 cycles. It could be concluded that this waste can be employed in refractory brick production for furnace lining.
      PubDate: 2014-07-01
       
  • The Effect of Molybdenum on the Tribological Behavior of Nfgrey (8) Cast
           Iron

    • Abstract: The Effect of Molybdenum on the Tribological Behavior of Nfgrey (8) Cast Iron
      Pages 126-134
      Author Bello S. A.Agunsoye J. O.Hassan S. B.Talabi S. I.Moumoh K. I
      The effect of molybdenum on the morphological and wear behaviour of Nigeria Foundries grey cast iron (8) [NFgrey(8)] has been studied. The microstructural and mechanical properties of the cast samples for the control and the NFGrey(8)/Molybdenum alloy were characterised using SEM, XRD, Brinell Hardness and impact energy testing Machine respectively. MATLAB linear curve fitting technique was used to obtain the approximate linear equation via first differential approach. The results show that molybdenum addition improved significantly the wear resistance of the NFGrey(8) cast iron. However, the toughness of the alloy was sacrificed. The strong and hard intermetallic compounds within the matrix are attributable to wear resistance of the NFGrey(8)/Mo alloy.
      PubDate: 2014-07-01
       
  • Physical and Mathematical Simulation of Fluid Flow in a Wide Single-strand
           Tundish for Slab Continuous-casting

    • Abstract: Physical and Mathematical Simulation of Fluid Flow in a Wide Single-strand Tundish for Slab Continuous-casting
      Pages 109-118
      Author Liangcai ZhongRuichao HaoJunzhe LiLei LiYingxiong ZhuNinghui X
      Molten steel flow in a wide single-strand tundish with different flow control devices (FCDs) for slab continuous-casting was investigated by physical and mathematical simulations in this work. The effects of different FCDs on the flow characteristics and velocity and temperature fields in the tundish with larger width, shorter length and larger depth were studied. The results showed that locations and dimensions of weirs and dams and geometry of turbulence inhibitors (TIs) have a large effect on the flow characteristics and velocity and temperature profiles. Adoption of a square turbulence inhibitor without extending top lips can improve the molten steel flow better than that with top extending lips in the tundish. In comparison with the former tundish configuration, the flow characteristics are improved to a great extent in the optimum case. A big “spring uprush” forms on the free surface around the long shroud when molten steel flows into a turbulence inhibitor with extending top lips and rushes up reversely out of the TI, while four small “spring uprushes” appear on the surface when a square TI without extending top lips is adopted because the liquid steel flows mainly out of the 4 corners of the square TI. The flow of liquid steel in the former tundish configuration is not reasonable and the height of an area where temperature is less than 1819 K is about half of liquid surface height at the right side of the stopper, which means that big dead zone exited in the former tundish configuration. In the optimum case, the height of such area was only one seventh of the liquid surface height. The RTD curves obtained from the mathematical simulation are agreed with those from the physical modeling and the flow characteristics obtained from these two methods in this work are coincident with each other.
      PubDate: 2014-07-01
       
  • Image Analysis as an Applicative Mean of Indentation Depth Determination

    • Abstract: Image Analysis as an Applicative Mean of Indentation Depth Determination
      Pages 104-108
      Author M. NaderiM. Azami GhadikolaeiK. SardashtiM. Iranmanes
      A practical noncontact technique has been developed with the purpose of estimating depth of residual impressions remained after serial indentation. A simple image-processing step was employed to analyze the pictures of indentation points obtained by conventional photography at close distances. Brightness levels of the indents that were obtained by the image analysis have been correlated with penetration depths, based on the inverse-square light attenuation law. For a single indent, the penetration depth estimated by the suggested brightness-depth correlation has been compared to the real depth measured by AFM. The deviation level of below 5% suggests that this technique can be a viable alternative to current expensive depth sensing methods.
      PubDate: 2014-07-01
       
  • Isotopic Expansion of Boron

    • Abstract: Isotopic Expansion of Boron
      Pages 97-103
      Author Levan ChkhartishviliOtar TsagareishviliDomenti Gabuni
      Boron isotope substitution in boron-rich lattices is important because many properties of such materials are structure sensitive. There are measured the unit cell expansion at the room temperature and temperature-dependence of thermal expansion for β rhombohedral boron, when 11B atoms are replaced by 10B atoms. Theoretical analysis of experimental results associates the observed changes in structures of samples of various isotope compositions with isotope effects rather than with technologically concomitant impurities.
      PubDate: 2014-07-01
       
 
 
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