The hot forging of large-scale P/M TiAl alloy billet deformation was investigated based on a joint application of Deform-3D-based numerical simulation and physical simulation techniques.The temperature dependence on the thermal and mechanical properties of the billet was considered and the optimum hot working temperature of packed TiAl alloy was 1150-1200 ℃.Based on the simulation,the material flow and thermo mechanical field variables,such as stress,strain,and temperature distribution were obtained and the relationships of load—displacement and load—time were figured out.To verify the validity of the simulation results,the experiments were also carned out in a forging plant,and a pancake with diameter of 150 mm was obtained exhibiting a regular shape.%基于Deform-3D数值模拟技术和物理模拟技术,对大尺寸粉末冶金TiAl合金坯的热锻过程进行模拟分析,研究锻坯的热力学性能与温度场的相关性,获得应力、应变和温度场的分布规律以及载荷随行程和时间的变化规律等一系列高温塑变特征.在此基础上,设计新型的锻造包覆机构,并进行工程实验验证.结果表明:1150～1200℃是热包覆锻造的最优热加工温度区间,最终获得外观良好的大尺寸钛铝合金锻饼,其直径大于150mm.
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