The effects of carbon and dispersed carbides on the mechanical properties of vanadium-titanium alloy
AuthorMathews, David Ross
Mining & Metallurgical Engineering
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Vanadium-carbon and vanadium-titanium-carbon alloys in the range from 0.03Z to 1.26 at-pct carbon, and from zero to 53.5 at-pct titanium were prepared and studied to determine the effects of carbon and dispersed carbides on their mechanical properties. Carbide second phase, occurring in alloys containing 0.178 at-pct carbon and higher, reduced the average recrystallized grainsize (annealed at 900° C for one hour) substantially from 3.8 to 0.41 x 10 3 inch diameter, for a carbon increase from 0.038 to 1.13 at-pct. Titanium in the range from 13.5 to 25.6 at-pct also caused a drastic reduction in recrystallized grainsize. Precipitated second phase carbide particles increased the yield strength of vanadium-carbon alloys from 24 x 103psifor unalloyed vanadium, to 33 x 103psi for vanadium containing 0.178 at-pct carbon. Solution heat-treatment and quenching increased the 0.178 at-pct carbon alloy yield strength up to about 44 x 10 psi. Aging at 350° C for 30 minutes increased the hardness to a lower yield strength equivalent of about 70 x 10 psi. Solution heat-treating and aging improved the strength of most vanadium-titanium-carbon alloys from 10 to 20 x 10 psi. Dispersed carbides had little effect on the strength and hardness of all but one or two alloys near the solubility limit of carbon in the alloy matrix. This appeared to be less than 0.178 at-pct carbon regardless of the titanium content. The lower yield strength and ultimate tensile strength of annealed vanadium-titanium alloy was increased to a maximum of 88 x 10 psi and 95 x 10 psi respectively with 40 at-pct titanium.
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