Ti-43Al-9V-Y合金包套熱軋熱力耦合有限元模擬Thermo-mechanical coupling finite element simulation for hot rolling process of canned Ti-43Al-9V-Y alloy

采用ABAQUS有限元模擬軟件對Ti-43Al-9V-Y合金的軋制過程進行模擬，建立三維熱力耦合有限元模型，分析軋制狀態(tài)下包套和合金的溫度場、應(yīng)力場以及等效應(yīng)變場。結(jié)果表明：包套的存在保證合金在變形過程中獲得均勻的溫度場。軋制過程中包套和TiAl坯料棱邊處的溫降較芯部大。包套軋制后TiAl坯料棱邊處等效應(yīng)力值較高。包套的存在承擔(dān)一部分切應(yīng)力，使TiAl合金所受切應(yīng)力較低，能有效降低橫向裂紋產(chǎn)生的幾率。包套和TiAl坯料的變形抗力匹配性較好，并且均具有兩端以及棱邊處等效應(yīng)變量較大的特點。

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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