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为了研究TC18钛合金在等高温压缩过程中组织与性能的变化,以Gleeble-1500热模拟试验机进行等高温压缩试验,计算得到所有试样的单向压缩膨胀系数均大于0.9,验证了热压缩试验的有效性。通过控制变量法研究不同变形温度和应变速率对其力学性能以及微观组织的影响,结果表明:TC18钛合金等高温热压缩时,流变应力随着变形温度的升高而降低,随着应变速率的增大而增大;而随着温度和应变速率的增加,组织中的初生等轴α相和次生针状α相逐渐发生相变而消失,β相逐渐长大形成粗大的β晶粒组织,并伴随有动态回复和动态再结晶两种软化机制。
In order to study the microstructure and properties of TC18 titanium alloy during isothermal compression, the uniaxial compressive expansion coefficients of all specimens were calculated to be greater than 0.9 using the Gleeble-1500 thermal simulator. The results show that the thermal compression The effectiveness of the test. The effects of different deformation temperature and strain rate on the mechanical properties and microstructure of the TC18 titanium alloy were investigated by the controlled variable method. The results show that the flow stress decreases with the increase of the deformation temperature under high temperature hot compression of TC18 titanium alloy. With the strain rate With the increase of temperature and strain rate, the primary equiaxed α phase and the secondary needle-like α phase in the microstructure gradually change and disappear, and the β phase gradually grows to form coarse β grains Organization, and accompanied by dynamic response and dynamic recrystallization two softening mechanism.