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采用Gleeble-3800型热模拟实验机对一种新型高温钛合金Ti-6Al-2Sn-4Zr合金的高温塑性变形进行了研究,并利用数码显微镜对金相组织进行了观察。通过研究得到变形条件(变形温度、变形速率)对其成形的力学性能和组织的影响规律。结果表明:在相变温度以下变形时,流变应力先快速升高然后逐渐平缓下降,而后趋于稳定状态,中间出现了曲线软化现象;在相变温度以上,在高应变速率时,出现应力不连续屈服现象;变形随应变速率的增加,动态再结晶晶粒细化。
The high temperature plastic deformation of Ti-6Al-2Sn-4Zr alloy, a new type of high temperature titanium alloy, was studied by Gleeble-3800 thermal simulation machine. The microstructure of the alloy was observed by digital microscope. Through the study, the influence of deformation conditions (deformation temperature and deformation rate) on the mechanical properties and microstructure of the formed parts were obtained. The results show that when the deformation is below the phase transition temperature, the flow stress increases rapidly and then gradually decreases gradually, and then tends to the steady state with the curve softening phenomenon. When the strain is higher than the phase transition temperature, the stress occurs at high strain rate Discontinuous yielding; deformation With the strain rate increases, dynamic recrystallization grain refinement.