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Journal of Metallurgical Engineering
   [6 followers]  Follow    
  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  [46 journals]
  • Effect of Compositional Changes on the Mechanical Behaviour of Grey Cast
           Iron

    • Abstract: Effect of Compositional Changes on the Mechanical Behaviour of Grey Cast Iron
      Pages 92-95
      Author S.O Seid
      The effect of varied inoculants on the composition, hardness and tensile properties of gray cast iron has been investigated. 0.1wt%, 0.2wt% and 0.3wt% of ferro-silicon inoculants was added to the stream of the iron melt during tapping for uniform dissolution and later poured into prepared sand mould. The cast samples were prepared for metallographic analysis. Hardness and tensile test were determined with standard samples. Mechanical properties are shown to be a function of the matrix, graphite or carbide forms. The increase in inoculants addition increases the carbon equivalent, but tensile and hardness properties was found to decrease. Hardness properties decreases from 58.9HRC to 44.70HRC from un-inoculated to 0.3wt% inoculated grey iron respectively
      PubDate: 2014-04-09
       
  • Simulation Analysis on Temperature Field and Microstructure Field of 60AT
           Rail in Air Cooling

    • Abstract: Simulation Analysis on Temperature Field and Microstructure Field of 60AT Rail in Air Cooling
      Pages 78-83
      Author Zeyuan LiLin ChenGuo ChangZhiyang ZhangFang Zhan
      In this paper, the DEFORM-3D finite element software is used to construct the models of temperature and microstructure fields of the 60AT rail during the air cooling process after rolling, with the distribution regularities of temperature and phase-transformation in air cooling analyzed. The computation results suggest that the temperature distribution along the cross section of the 60AT rail is significantly influenced by its rail web with great volume-to-surface-area ratio. At 150s during the air cooling process, there is no phase change on the cross section of the 60AT rail, with all phase that appears to be austenite. At 650s with the temperature dropped, the almost all the cross section of the rail has been turned into pearlite, with the changing rate of 97.2%. The pearlite phase change happens from the three edges of the railhead and the long and short wings of the rail flange to the railhead and the rail web, until the whole cross section of the rail is changed.
      PubDate: 2014-04-09
       
  • Modelling the Hardness Property of Produced Martempered Ductile Iron
           Through Interrupted Quenching Method

    • Abstract: Modelling the Hardness Property of Produced Martempered Ductile Iron Through Interrupted Quenching Method
      Pages 84-91
      Author Oyetunji AkinlabiBarnabas A. A.Adewara J.O.T
      In this research, modelling the hardness property of produced Martempered Ductile Iron (MDI) through interrupted quenching method was studied. Martempered ductile iron was produced by the adoption of interrupted quenching in warm water (cheap, convenient and safe to operate – compared to the conventional method in salt bath furnace). The product (MDI) was found to possess unique high hardness values of 52.9Rc at a low tempering temperature and holding time having a predominantly martensite, graphite nodules enveloped with ferrite shells in its microstructures. A computer model was developed to predict the hardness values of the developed MDI and a model equation, Y = 62.504 – 0.079T (oC) – 0.054t (minutes) was established, with a desirable degree of correlation and reliability for the hardness characterization. The model was tested using statistical tools and manual, and it was found to compare favourably well with the experimental results.
      PubDate: 2014-04-09
       
  • A Probe into Failure of Selected Plumbing Parts: Alloy Composition,
           Microstructural Condition and Aqueous Exposure

    • Abstract: A Probe into Failure of Selected Plumbing Parts: Alloy Composition, Microstructural Condition and Aqueous Exposure
      Pages 69-77
      Author Iyiola OtunniyiOluwayimika O. Oluoku
      A probe into the metallurgical integrity of selected plumbing parts was carried out for an informed evaluation of the failures observes in service. Faucets and sink drainer were focused on. Alloy compositions and microstructures were assessed, and test exposures to normal service conditions were simulated. Alloys were found with off-specification compositions, with residual stresses in the microstructures providing energy to initiate degradation early in service. Hence, plumbing parts corrodes freely in ordinary neutral water, with metal overload in water. The materials choice and production design predisposes the units to short service life. Conformity to basic material and manufacturing standards is still lacking in some operations.
      PubDate: 2014-04-09
       
  • Thermal Properties of Al/β-SiC Composite Fabricated by Spark Plasma
           Sintering (SPS)

    • Abstract: Thermal Properties of Al/β-SiC Composite Fabricated by Spark Plasma Sintering (SPS)
      Pages 59-68
      Author Kiyoshi MizuuchiKanryu InoueYasuyuki AgariMasakazu KawaharaYukio MakinoMikio It
      β-SiC-particle-dispersed-aluminum (Al) matrix composite was fabricated in solid-liquid co-existent state by spark plasma sintering (SPS) process from the mixture of β-SiC powders, Al powders and Al-5mass% Si powders. The microstructures and thermal conductivities of the composite fabricated were examined. This composite was all well consolidated by sintering at a temperature range between 798 and 876 K for 1.56 ks during SPS process. No reaction at the interface between the β-SiC particle and the Al matrix was observed by scanning electron microscopy for the composite fabricated under the sintering conditions. The relative packing density of the Al-matrix composite with dispersed β-SiC particles was higher than 99% in a volume fraction range of SiC between 40 and 50 %. Thermal conductivity of the composite was higher than 200 W/mK in a β-SiC volume fraction range between 40 and 50 vol.%. The highest thermal conductivity was obtained for Al-45 vol.%β-SiC composite and it is 216 W/mK. The coefficient of thermal expansion of the composite is (14~16)×10−6 /K and falls in the upper line of Kerner’s model. This indicates strong bonding between the β-SiC particle and the Al matrix in the composite.text.
      PubDate: 2014-04-09
       
 
 
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