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摘要：
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采用物理模拟和数值模拟相结合的手段,对汽车花键轴的温热控制精锻工艺进行了深入的研究。通过温热条件下的热压缩实验,测定汽车花键轴用40Cr钢在变形温度为850℃、900℃、950℃、1000℃,最大真应变为0.7,应变速率为0.1s-1,0.5 s-1,5 s-1,20 s-1的应力应变关系。把通过热模拟实验研究确定的微观演化模型,引用有限元数值模拟软件,对其工序进行全过程模拟,确定了汽车花键轴温热精锻的最佳工艺参数范围。经试验验证该工艺能够通过控制温热变形参数来控制再结晶过程,从而使温热变形之后得到较细晶粒。具有既能简化工艺,节约能源,同时又获得优良的内部组织与较高的综合机械性能的特点。
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Warm-hot control forging process of automobile spline shaft is investigated by using physical simulation and numerical simulation.The hot deformation behavior of 40Cr steel is studied by a compression test at the conditions that the temperature is 850~1000℃,the maximum true strain is 0.7 and strain rate is 0.1~20 s~(-1).The best range of deformation parameters are predicted by using microstructural evolution model and FEM simulation.Finer grains are obtained by using the prediction result in the trial.The forging process is simplified,energy consumption is reduced and the product of high strength,hardness and good toughness is acquired by warm-hot control forging process.
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基金项目：
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作者简介：
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参考文献：
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[1]张质良.温塑性成形技术[M].上海:上海科学技术文献出版社,1986.
[2]朱伟成.汽车零件精密锻造技术[M].北京:北京理工大学出版社,1999.
[3]Hodgson P D.Microstructure modelling for property predic-tion and control[J].Journal of Materials Processing Tech-nology,1996,60(1 4):27 33.
[4]Medina E A,Venugopal S,Frazier W G,Medeiros S,et al.Optimization of microstructure development:application to hotmetal extrusion[J].Journal of Materials Engineering andPerformance,Materials Park,1996,5(6):743 753.
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