Effect of heat treatment on microstructure and mechanical properties of TA 15 alloy fabricated by additive manufacturing
TA15(Ti-6.5Al-2Zr-Mo-V)alloy samples were prepared using laser continuous powder bed fusion technology and subjected to normalizing treatment at different temperatures.The effect of heat treatment temperature on microstructure and mechanical properties of the TA15 alloy samples was studied using optical microscope,scanning electron microscopy,X-ray diffraction and tensile testing.The results show that when the heat treatment temperature increases from 700 ℃ to 950 ℃,the grain size of the TA15 alloy samples significantly increases,the KAM angle difference significantly decreases,the elongation significantly increases,and the tensile strength and yield strength decrease.When the heat treatment temperature(1050 ℃)exceeds the phase transition temperature of the alloy,the β phase will be formed and the elongation will decrease again.Compared with the directly manufactured sample,after heat treatment at 950 ℃,the room temperature elongation of the sample increases by more than 93％,and the high temperature elongation at 500 ℃ increases by more than 63.8％,which basically meets its usage requirements in the aerospace field.
TA15 titanium alloylaser continuous powder bed fusionheat treatmentmechanical property
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