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利用Gleeble-1500热模拟机进行了铸态Ti-46.5Al-2.5V-1.0Cr-0.3Ni合金高温热压缩实验,研究了其在1000～1200℃和0.001～1.0s-1条件下开坯时的显微组织转变过程,并采用定量金相方法对TiAl合金在不同变形工艺参数条件下的微观组织特征进行了实验研究和量化描述。根据实验结果建立了TiAl合金热变形过程中的动态再结晶百分数模型和动态再结晶晶粒尺寸模型,可为预测和控制TiAl合金高温锻造开坯工艺提供理论依据。
The high temperature hot compression experiment of as-cast Ti-46.5Al-2.5V-1.0Cr-0.3Ni alloy was carried out by using Gleeble-1500 thermal simulator. When it was diced at 1000-1200 ℃ and 0.001-1.0s-1 The microstructural transformation of TiAl alloy under different deformation parameters was studied quantitatively by metallographic method. According to the experimental results, the dynamic recrystallization percentage and the dynamic recrystallization grain size model during the hot deformation of TiAl alloy are established, which can provide a theoretical basis for predicting and controlling the high temperature forging bloom process of TiAl alloy.