Effect of solution treatment in β-phase region on grain size and uniformity of a new TB17 titanium alloy
Firstly,the new TB17 titanium alloy was subjected to solution treatment in the β-phase zone(900-1050 ℃)for different time(30-120 min),and the grain size of the alloy after solution treatment was statistically analyzed.The grain growth behavior and uniformity of the alloy in the β-phase region were studied,and the β-phase growth index n and growth activation energy Q of the alloy were calculated.β grain growth model above the β-phase transition point was established.The results show that with the increase of holding time,the change trend of β grain size of the alloy is first increase rapidly,and then the increase rate tends to slow down.At lower heating temperatures(900-950 ℃),the β grain grows slowly,and above 1000 ℃,the β grain grows rapidly.The average grain growth index in the β-phase region of the alloy is 0.248,and the activation energy of grain growth in the β-phase region is 51.9 kJ/mol.In terms of grain size uniformity,with the increase of holding time,the uniformity of β grain size increases.When the holding time is less than 60 min,the uniformity of β grain size is poor.There is a power function relationship between the β grain size and the holding time.A β grain growth model for above the β phase transition point is established:Dn-D0=13494 × t0.248exp(-71903/RT),and the average error between the calculated values of the model and the experimental data is 5.5％.
new TB17 titanium alloyβ grain growthuniformitymodel
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