Showing 2 results for Vajd
M. Shaban Ghazani, A. Vajd, B. Mosadeg,
Volume 12, Issue 1 (march 2015 2015)
Abstract
The aim of the present study is the prediction of critical conditions (including critical strain and flow stress)
for the initiation of dynamic recrystallization during thermo-mechanical processing of plain carbon steels. For this
propose, torsion tests were conducted at different temperature (1050, 1100 and 1150˚C) and strain rates (0.002, 0.02
and 0.2/s). All flow curves showed a peak stress indicating that dynamic recrystallization occurs during hot
deformation. The critical stress and strain were then determined based on change in strain hardening rate as a function
of flow stress. Finally, the effect of deformation conditions on these parameters was analyzed.
A. Fattah-Alhosseini, M. Ranjbaran, S. Vajdi Vahid,
Volume 12, Issue 2 (June 2015)
Abstract
In this study, corrosion behaviour of A356-10 vol.% SiC composites casted by gravity and squeeze casting
is evaluated. For this purpose, prepared samples were immersed in HCl solution for 1h at open circuit potential. Tafel
polarization and electrochemical impedance spectroscopy (EIS) were carried out to study the corrosion resistance of
composites. The Tafel polarization and EIS studies of the corrosion behaviour of the A356-10 vol.% SiC composites
showed that the corrosion resistance of the composite casted by squeeze casting was higher than that of the composites
casted by gravity in selected corrosion media. Also, the Tafel polarization and EIS studies revealed that the corrosion
current densities of both composites increase with the increase in the concentration of HCl. The micrographs of
scanning electron microscope (SEM) clearly showed the squeeze casting composite exhibits a good dispersion/matrix
interface compared to that of the composites produced by gravity casting
