%0 Journal Article
%T Effect of Heat Treatment Processes on Microstructure and Mechanical Behavior of TC21 Titanium Alloy
%A Ramadan N. Elshaer
%A Khaled M. Ibrahim
%A Azza F. Barakat
%A Reham R. Abbas
%J Open Journal of Metal
%P 39-57
%@ 2164-277X
%D 2017
%I Scientific Research Publishing
%R 10.4236/ojmetal.2017.73004
%X <div style=\"text-align:justify;\">
	The effect of heat treatment on microstructure and tensile properties as well
as wear behavior on TC21 (Ti-6Al-2Sn-2Zr-3Mo-1Cr-2Nb-Si, wt.%) Ti-alloy
was investigated. The samples were solution treated at 900¡ãC for 15 min followed
by furnace cooling to 800¡ãC with a cooling rate 1¡ãC/min and holding
for 20 min, then the samples cooled down to room temperature either using
water quenching (WQ) or air cooling (AC). Consequently, aging treatment
was applied at 575¡ãC for 4 hr. The microstructure feature showed a secondary <i>¦Á</i> phase (<i>¦Á</i><sub>s</sub>) precipitated in residual <i>¦Â</i> phase due to the step cooling from
900¡ãC to 800¡ãC inside furnace as well as the aging treatment. The highest
wear rate was obtained for WQ samples due to increasing in volume fraction
of <i>¦Á</i><sub>p</sub> (58%). However, the lowest wear rate was reported for WQ + Aging
samples due to the high hardness. Optimum mechanical properties of the studied
TC21 Ti-alloy were obtained for AC + Aging condition. A better combination
of hardness, tensile properties, and wear resistance was achieved for
AC + Aging samples, although their wear resistance was found to be slightly
lower than that of WQ + Aging samples.
</div>
%K TC21 Ti-Alloy
%K Cooling Rate
%K Aging
%K Microstructure
%K Tensile Properties
%K Wear
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=80105