Effect of Triple Heat Treatment on Microstructure and Properties of Radial Forged Ti-6Al-4V Titanium Alloy
The influence of several triple heat treatment processes on the microstructure and properties of radial forged Ti-6Al-4V titanium alloy bar was studied.The results show that when subjected to triple heat treatment near the phase transition point,the microstructure is a basket like structure.The basketweave microstructure formed at the first heat treatment undergoes the second solid solution in the two-phase zone and the third aging,and there is little change in the microstructure state.As the solid solution temperature increases,the strength of the alloy gradually increases,and the closer it is to the phase transition point,the greater the magnitude of the increase;the elongation and reduction of area have a decreasing trend,and the decrease is bigger when the temperature approaches the phase transition point.When conducting triple heat treatment in the two-phase region,the microstructure of Ti-6Al-4V titanium alloy is typical two-state structure,including the isoaxial α-phase and transformed β,and the inner of the transformed β is the acicular secondary α-phase and residual β-phase.When the solid solution temperature is 920-950℃,there is a good matching relationship between strength and plasticity.When the heat treatment process is 950℃/1 h,AC+950℃/1 h,OQ+560℃/4 h,AC,the material obtains the best matching relationship between high strength and high plasticity.
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