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中文摘要：
采用有限元软件对高温合金Inconel690（IN690）高温高速热挤压工艺进行了数值分析,获得了不同工艺条件下变形材料内部的温度场、应变场、应力场、挤压力的变化规律。结果表明,随着挤压速度增加,变形的不均匀性增大,坯料的温度升高明显;随着变形温度升高,最大等效应力明显减小,其分布也趋于均匀化,使塑性提高。挤压力随着挤压速度的增大呈先减小后增大的趋势,随着挤压温度的增大而减小。数值模拟结果与试验结果的相对误差小于7.3%。IN690合金合理的挤压工艺参数是挤压速度为110～120mm/s,挤压温度为1200℃。
英文摘要：
Numerical simulation of hot extruding superalloy Incone1690（IN690） at high temperature and high speed was conducted by the finite element method（FEM） to present the change of temperature field,strain field,stress field and extruding force in deformed materials at different processing conditions. The results show that,with increasing in extruding speed,the deformation un-uniformity and the temperature-increment of the initial billets are increased,and with increasing in temperature,the maximum equivalent stress is reduced obviously with the improvement of distribution uniformity,leading to the improvement of the plasticity. The extruding force is firstly increased and then increased with the extruding speed increase,and it is decreased with the extruding temperature increase. The relative error between the simulated result and the experimental one is lower than 7.3%. The desirable processing parameters are as follows：extruding speed of 110～120 mm/s and extruding temperature of 1 200 ℃.
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