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mixed-microstructures
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Preparation and corrosion resistance of pulse electrodeposited Zn and Zn-SiC nanocomposite coatings
, Article Applied Surface Science ; Vol. 300 , May , 2014 , pp. 1-7 ; ISSN: 01694332 ; Mozafari, A ; Omidvar, H ; Javanbakht, M ; Sharif University of Technology
Abstract
Pure Zn and Zn matrix composite coatings containing nano-sized SiC particles with an average size of 50 nm were prepared from the zinc sulfate bath. The effects of the pulse frequency, maximum current density and duty cycle on the amount of particles embedded were examined. Electron microscopic studies revealed that the coating morphology was modified by the presence of SiC nanoparticles. In the presence of SiC nanoparticles deposit grows in outgrowth mode resulting in a very rough and porous microstructure. However, at very low and very high duty cycles a smooth and pore free microstructure was obtained. Corrosion resistance properties of the coatings were studied using potentiodynamic...
Optimization of mechanical properties of a micro alloyed steel
, Article Materials and Design ; Volume 30, Issue 6 , 2009 , Pages 2167-2172 ; 02641275 (ISSN) ; KhamenehAsl, Sh ; Akbarzadeh, A ; Daneshi, G. H ; Sharif University of Technology
2009
Abstract
In this work, the effect of hot deformation temperature on microstructure and mechanical properties of micro alloyed steel was studied. The results indicated that by decreasing the deformation temperature final microstructure is refined and the volume fraction of grain boundary ferrite is increased and some pearlite is produced. Therefore both the yield strength and ultimate tensile strength is increased, while the toughness is preserved in comparison to a ferritic-pearlitic microstructure. Also a model was developed to relate the deformation condition to the volume fraction of acicular ferrite at mixed microstructure. © 2008 Elsevier Ltd. All rights reserved