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應(yīng)變對TB9鈦合金熱變形行為及顯微組織的影響
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更新時(shí)間：2015-09-12
采用Gleeble-3800熱模擬試驗(yàn)機(jī)對TB9鈦合金進(jìn)行等溫壓縮試驗(yàn)，變形溫度分別為850和950 ℃，應(yīng)變速率為1 s-1，真應(yīng)變分別為0.3，0.5，0.7，0.9和1.2，研究應(yīng)變對TB9合金熱變形行為及顯微組織的影響。
應(yīng)變對TB9鈦合金熱變形行為及顯微組織的影響Effect of strain on hot deformation behavior and microstructure of TB9 titanium alloy
采用Gleeble-3800熱模擬試驗(yàn)機(jī)對TB9鈦合金進(jìn)行等溫壓縮試驗(yàn)，變形溫度分別為850和950 ℃，應(yīng)變速率為1 s-1，真應(yīng)變分別為0.3，0.5，0.7，0.9和1.2，研究應(yīng)變對TB9合金熱變形行為及顯微組織的影響。結(jié)果表明：溫度越高，流變應(yīng)力越小；在較小應(yīng)變下，顯微組織主要發(fā)生動(dòng)態(tài)回復(fù)，隨著應(yīng)變增大，動(dòng)態(tài)回復(fù)、動(dòng)態(tài)再結(jié)晶增強(qiáng)，同時(shí)，出現(xiàn)幾何動(dòng)態(tài)再結(jié)晶現(xiàn)象；變形溫度為950℃時(shí)，合金易發(fā)生動(dòng)態(tài)再結(jié)晶，但變形量不能過大，否則會形成粗大的再結(jié)晶晶粒，造成顯微組織不均勻，合適的真應(yīng)變?yōu)?.7~0.9。
The effect of strains on hot deformation behavior and microstructure of TB9 titanium alloy were investigated by isothermal compression tests on a Gleeble-3800 thermomechanical simulator at deformation temperatures of 850 ℃ and 950 ℃, the strain rate of 1 s-1?and true strains of 0.3, 0.5, 0.7, 0.9 and 1.2, respectively. The results show that the flow stress decreases with increasing temperature. The microstructure undergoes dynamic recovery mainly at small strains. With strains increasing, dynamic recovery and dynamic recrystallization are enhanced and geometrical dynamic recrystallization occurs at high strains. At 950 ℃, dynamic recrystallization happens more easily but large recrystallization grains can be generated at high strains, which causes inhomogeneous microstructure. Beneficial true strains are 0.7-0.9 when TB9 alloy is deformed at 950 ℃ and 1 s-1.
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