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选取经挤压比为12的双相γ-TiAl合金棒材,通过Gleeble等温热压缩实验获取温度为900～1100℃、应变速率为0.01～1s-1之间的流变应力数据,并得出其本构关系。通过有限元方法对γ-TiAl合金叶片的锻造过程进行模拟。结果表明,预热温度和模锻速度对应变场的大小及分布影响很小,而对温度场和应变速率场大小及分布均有影响。
The billet γ-TiAl alloy rod with an extrusion ratio of 12 was selected to obtain the flow stress data with the temperature of 900 ~ 1100 ℃ and strain rate of 0.01 ~ 1s-1 by Gleeble isothermal compression test Out of its constitutive relationship. The forging process of γ-TiAl alloy blades was simulated by finite element method. The results show that the preheating temperature and swaging speed have little effect on the size and distribution of the strain field, but have an impact on the size and distribution of temperature field and strain rate field.