Ti-43Al-9V-Y合金包套热轧热力耦合有限元模拟Thermo-mechanical coupling finite element simulation for hot rolling process of canned Ti-43Al-9V-Y alloy

采用ABAQUS有限元模拟软件对Ti-43Al-9V-Y合金的轧制过程进行模拟，建立三维热力耦合有限元模型，分析轧制状态下包套和合金的温度场、应力场以及等效应变场。结果表明：包套的存在保证合金在变形过程中获得均匀的温度场。轧制过程中包套和TiAl坯料棱边处的温降较芯部大。包套轧制后TiAl坯料棱边处等效应力值较高。包套的存在承担一部分切应力，使TiAl合金所受切应力较低，能有效降低横向裂纹产生的几率。包套和TiAl坯料的变形抗力匹配性较好，并且均具有两端以及棱边处等效应变量较大的特点。

The hot rolling of Ti-43Al-9V-Y alloy was simulated by ABAQUS finite element software. The three-dimensional thermo-mechanical coupling finite element model was constructed. The results show that the temperature field, stress field and equivalent strain field of rolled piece were analyzed under the condition of rolling. The uniformity of temperature field can be improved by cans in the process of deformation. The temperature drop on the edge of rolled piece is higher than that in the centre. Equivalent stress is higher on the edge of rolled piece. The shear stress on the surface of TiAl would be relieved by cans, which would reduce the probability of transverse crack initiation. The deformation resistance of TiAl alloy matches well with that of the cans, and the equivalent strains on both ends and the edge of rolled piece are higher.

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