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针对TC16钛合金,进行等温恒应变速率高温压缩变形试验,研究该合金在700~950℃,应变速率为1~10s~(-1)条件下的应力-应变及组织演变,通过应力-应变曲线建立了合金的流变应力方程,并利用其应变硬化率θ与应变ε的θ-ε曲线确定其发生动态再结晶的临界应变ε_c。结果表明,当应变速率一定时,流变应力在700~850℃温度区间变形时比850~950℃变形时的递减幅度大;当合金变形量达到50%时,在较高应变速率(如6)ε=10s~(-1))下变形,可使组织中的再结晶晶粒尺寸进一步细化。
For TC16 titanium alloy, the isothermal constant strain rate high temperature compressive deformation test was carried out to study the stress-strain and microstructure evolution of the alloy under the strain rate of 1 ~ 10s ~ (-1) at 700-950 ℃. The stress- The flow stress equation of the alloy was established, and the critical strain ε_c of dynamic recrystallization was determined by the θ-ε curve of strain hardening rate θ and strain ε. The results show that when the strain rate is constant, the flow stress decreases more greatly at the temperature range of 700 ~ 850 ℃ than that of the deformation at 850 ~ 950 ℃. When the deformation of the alloy reaches 50% ) ε = 10s -1), the size of recrystallized grains in the microstructure can be further refined.