Effect of Solution Temperature on Microstructure of TB6 Titanium Alloy
The solution treatment of TB6 titanium alloy forging rod was carried out at 760,780,800 and 820℃respectively,X-ray diffraction and optical microscope were used to study the phase composition and microstructure of the alloy at different solution temperatures.The results show that,when the solution temperature is 760℃and 780℃,the content of primary α phase in TB6 titanium alloy rod is higher and the size is larger.The β matrix phase with grain size less than 5 μm can be obtained by pinning β grain boundary.At solution temperature of 800℃,most of the primary α phase is dissolved in the β matrix phase,the volume fraction of the remaining primary α phase is only about 2.65%,and the grain size of the β matrix phase increases,the thermally induced α′′ martensite phase appears.At solution temperature of 820℃,the primary α phase of TB6 titanium alloy bar disappears completely,and a large number of needle-like heat-induced α′′ martensite with crisscross distribution exists in β-matrix phase.
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