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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  [47 journals]
  • Bimodal and monomodal diamond particle effect on the thermal properties of
           diamond-particle-dispersed silver matrix composite fabricated by SPS

    • Abstract: Bimodal and monomodal diamond particle effect on the thermal properties of diamond-particle-dispersed silver matrix composite fabricated by SPS
      Pages 1-11
      Author Kiyoshi MizuuchiKanryu InoueYasuyuki AgariMasami SugiokaMotohiro TanakaTakashi TakeuchiJun-ichi TaniMasakazu KawaharaYukio MakinoMikio It
      Diamond-particle-dispersed silver (Ag) matrix composites consisting of monomodal and bimodal diamond particles were fabricated in spark plasma sintering (SPS) process, where the mixture of diamond, pure Ag and pure Si powders were consolidated in liquid and solid co-existent state. Microstructures and thermal properties of the composites fabricated in such a way were investigated and the bimodal and monomodal diamond particle effect was evaluated on the thermal properties of the composites. The composites can be well consolidated in a temperature range between 1113 K and 1188 K and scanning electron microscopy detects no reaction product at the interface between the diamond particle and the Ag matrix. Relative packing density of the composite containing monomodal diamond particles decreased from 97.4% to 93.4% with increasing volume fraction of diamond between 50% and 60%, whereas that of the composite containing bimodal diamond particles was as high as 99~97% in a volume fraction of diamond up to 65%. The composite containing bimodal diamond particles revealed the thermal conductivity around 720 W/mk at 60 and 65% of the volume fraction of the diamond particles and it was higher than that of the composite containing monomodal diamond particles in a volume fraction of diamond higher than 55%. The coefficients of thermal expansion (CTEs) of the diamond-particle-dispersed Ag-matrix composites fall in the upper line of Kerner model, indicating good bonding between the diamond particle and the Ag matrix in the composite. The CTEs of Ag-matrix composites containing bimodal diamond particles are 6.76×10-6/K at 62 vol.% diamond and 6.54×10-6/K at 65 vol.% diamond.
      PubDate: 2015-0
       
  • Numerical Calculation of the Comprehensive Heat Transfer Coefficient on
           the Surface of Rail in the Spray Cooling Process

    • Abstract: Numerical Calculation of the Comprehensive Heat Transfer Coefficient on the Surface of Rail in the Spray Cooling Process
      Pages 12-15
      Author Ge LiZhimin LiuLin chenXianqin Ho
      In order to determine comprehensive heat transfer coefficient on the surface of rail in the spray cooling process, the secondary development of the front and back processing module by the Python scripting language for ABAQUS. The Python scripts are written, and cooling curve of rail spray cooling experiment was used to calculate the comprehensive heat transfer coefficient. The results show that Python script can realize the function of automatically creating rail spray cooling model and iterative calculation for the comprehensive heat transfer coefficient under ABAQUS environment. And the time-varying temperature curve of rail which was calculated by using the comprehensive heat transfer coefficient approximates the experimental value.
      PubDate: 2015-0
       
  • Effect of Manganese Sulphide Shapes on the Work-hardening Coefficient of
           Hot Rolled Structural Steel

    • Abstract: Effect of Manganese Sulphide Shapes on the Work-hardening Coefficient of Hot Rolled Structural Steel
      Pages 16-23
      Author Ahmed I. Z. FarahatZainab Abdel-hamidNasser Goma
      This paper studied the effect of non-metallic inclusions shapes (manganese sulphides on the tensile testing behavior, the work-hardening coefficient and rate. Longitudinal and Transverse tensile testing was carried out. The fracture surface was studied after tensile testing. Chemical analysis for the non-metallic solution was conducted using EDS-SEM. Tensile testing was carried out in thickness direction and in parallel to the direction of rolling. The work-hardening coefficient (with tensile samples of the thickness) increases with the types II and III. It is found that the work-hardening rate for types of non-metallic inclusions is similar and has critical change. It is also observed that the non-metallic inclusions Type II and III can resist the crack propagation due to crack tip or plastic zone at the onset of crack.
      PubDate: 2015-0
       
 
 
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