for Journals by Title or ISSN
for Articles by Keywords
help
Followed Journals
Journal you Follow: 0
 
Sign Up to follow journals, search in your chosen journals and, optionally, receive Email Alerts when new issues of your Followed Jurnals are published.
Already have an account? Sign In to see the journals you follow.
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]
  • Deformation Structure Induced by Indentation in GaAs and Si Single
           Crystals
    • Abstract: Deformation Structure Induced by Indentation in GaAs and Si Single Crystals
      Pages 13-28
      Author Y.B. XuZ.C. LiY.Q. W
      Investigations conducted by the authors into the plasticity, damage, phase transformation and fracture induced by micro-indentation are critically reviewed. The materials used in this study are Si and GaAs single crystals. The principal findings are the following: (a) Micro-indentation may induce a transition from crystalline to nano-crystalline and amorphous structure. There is a critical stress for occurrence of the transition. The shear stress, rather than hydrostatic stress is proposed to be attributed to this transition. (b) The atomic-scale structures ahead of the crack-tip are extended and successfully screened by a high-resolution electron microscope (HREM) using both plane view and cross-sectional view. It is found that the crack tip is not atomically sharp, dislocations produced during indentation lead to the crystal lattice distortion and even to a transition from crystalline lattice to disordered structure resulting in an amorphous band with a width of 1-2 nm ahead of the crack tip. The crack propagates along the amorphous band rather than sequential rupture of cohesive bonds. (c) The results of fast Fourier transformation and corresponding inverse-fast Fourier transformation fringe images from different lattice planes reveal that deformation around the crack-tip is anisotropic. The lattice fringes along ( ) plane are not changed and the atom arrangement on this plane is still essentially ordered, and serious lattice distortion occurs on the planes of (001) and ( ). (d) In-situ observations by HREM show that there is a critical current density for the crystalline nucleation in amorphous area stimulated by an electron beam, and the crystalline nucleation is not related to the irradiation-induced temperature rise.
      PubDate: 2014-01-09
       
  • Real-Time Supervision of Annealing Process in Stainless Steel Production
           Lines
    • Abstract: Real-Time Supervision of Annealing Process in Stainless Steel Production Lines
      Pages 1-6
      Author Carlos G. SpinolaC.J. Galvez-FernandezJ.M. Cañero-NietoJ.M. Bonel
      Annealing is an important process in the production of stainless steel coils. This paper presents a system and its supervision in production lines. The model is based on continuous data of line speed, temperatures throughout the annealing furnace, and the detection of the start of each coil entering the furnace. Annealing functions have been proposed whose integration along the space-time trajectory provides a powerful supervision tool for quality control engineers. This model has been checked and adjusted with continuous data of magnetic remanence in the case of ferritic stainless steel.
      PubDate: 2014-01-09
       
  • The Effect of Pitting Corrosion on the Fatigue Strength of 304 and 316
           Stainless Steel Alloys
    • Abstract: The Effect of Pitting Corrosion on the Fatigue Strength of 304 and 316 Stainless Steel Alloys
      Pages 7-12
      Author Ibrahim GhayadS.A. Al-TaherK .M . IbrahimY.E. Baraka
      Pitting corrosion behavior of 304 and 316 stainless steel alloys was investigated in 3.5% NaCl solution containing 100 ppm thiosulfate ion as pitting corrosion initiator. Experiments were performed using potentiodynamic polarization and potentiostatic techniques at room temperature. The shape, size, and pit depth of the formed corrosion pits were also determined using the metallurgical light microscope. The fatigue strength of the pitted samples (either single or multipitted) was determined using plain-bending fatigue test machine. The fracture surface was also investigated using scanning electron microscope (SEM). The results show that SS 304 is more susceptible to pitting corrosion and has lower fatigue strength than SS 316 for the unpitted alloys samples. For both alloys, the single pitted samples shows that a deterioration percentage in fatigue is of about 15% while the multi pitted samples shows a deterioration percentage in fatigue of about 33% compared to the unpitted samples. The crack through the specimen surface was noticed to be initiated from the pit and propagates in two perpendicular sides to each other.
      PubDate: 2014-01-09
       
  • Review Article: Composite and Nanocomposite Coatings
    • Abstract: Review Article: Composite and Nanocomposite Coatings
      Pages 29-42
      Author Zeinab AbdelHami
      Composite or nanocomposite coatings, a new branch of deposition that possess unique physical and mechanical properties are formed by mixing two or more dissimilar materials at the micron or nanoscale. Composites are used when a combination of properties is required that cannot be found in a single material. The properties of composite depend upon not only the individual components used but also the morphology and the interfacial characteristics. The nancomposites can exhibit enhanced mechanical, electrical, magnetic, and/or optical properties compared with their conventional micron-scale (or larger) counterparts. Nano-composite materials and coatings therefore offer enormous potential for new applications including: aerospace, automotive, electronics, biomedical implants, non-linear optics, mechanically reinforced lightweight materials, sensors, nano-wires, batteries, bioceramics, energy conversion and many others. This review presents the scientific framework for the advances in the composite and nanocomposite coatings research, including fundamental composition/property relationships, fabricating techniques, and applications of nanocomposite coatings. Additionally, the co-deposition of various metallic matrices with a great variety of nano-sized powders from hard carbides, oxides, and ceramics are discussed.
      PubDate: 2014-01-09
       
  • Numerical Analysis and Simulation of Stress Evolution in the Straightening
           Process of Different Heavy Rails
    • Abstract: Numerical Analysis and Simulation of Stress Evolution in the Straightening Process of Different Heavy Rails
      Pages 43-47
      Author Lin ChenXiaoting WangWei TongZeyuan LiGuo Chan
      In the paper, the ABAQUS is adopted to carry on numerical simulation on straightening process of U75V heavy rail whose chord height is 80mm under the 20.9-13.2-5.6-5.4 standard. Formation mechanisms and changing rules of the internal stress are analyzed in straightening process of different heavy rails. The results show that residual stress in rail head of 75kg/m heavy rail is larger than 60kg/m heavy rail’s and the gap is 220MPa between 75 kg/m l and 60kg/m heavy rail and the gap of residual stress is insignificant in rail waist. Residual stress in rail bottom of 75kg/m heavy rail is larger and the gap is 16MPa between 75kg/m and 60kg/m heavy rail. The residual stress can be reduced by reasonable straightening process and reasonable straightening process contributes to improving the quality and service life of rail.
      PubDate: 2014-01-09
       
  • Organization Simulation Analysis of the U75V Cooling Process
    • Abstract: Organization Simulation Analysis of the U75V Cooling Process
      Pages 48-51
      Author Fang ZhangLin ChenZhiyang ZhangRan We
      Based on the finite element software DEFORM-3D, temperature field, the bending deformation and organize field were simulated in the process of U75V rail air cooling. The change rules of temperature, deflection and phase composition during air cooling process were analyzed. Then, from the comprehensive views of temperature and phase transition, some reasons for rail bending deformation were found, which will help design rail quenching process.
      PubDate: 2014-01-09
       
  • Assessment of Thermogravimetry for Organic Content Analysis in Printed
           Circuit Boards Comminution Fines
    • Abstract: Assessment of Thermogravimetry for Organic Content Analysis in Printed Circuit Boards Comminution Fines
      Pages 52-57
      Author Iyiola O. Otunniy
      Secondary resource stream can be very composite in constitution and the procedure for reliable chemical and physical analysis therefore unconventional. Thermogravimetric analysis (TGA) has been mentioned for organic constituent analysis of end-of-life printed circuit board (PCB). The applicability is hereby examined. Experimental TG/DTG with oxygen and nitrogen atmospheres were carried out on PCB comminution fines. The resulting TG plot does not show sharp inflexions to enable distinct identification of any constituent; there were diverse material particles in the sample and many reactions with gain and loss in mass occur simultaneously over the whole temperature range. The DTG plot however indicates some peaks, which by matching known thermal data of polymeric materials to the temperatures at the DTG peaks, some qualitative indications can be made. This will be confirmable by complementary techniques such as infra-red spectroscopy. This is the qualitative extent to which TG is considered applicable for this composition.
      PubDate: 2014-01-09
       
 
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
 
About JournalTOCs
API
Help
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-2014