在MTS热模拟实验机上采用热压缩实验的方法研究了在温度为950—1150℃、应变速率为0.001—1 s-1的实验条件范围内，GH4586合金高温塑性变形过程中变形温度、应变速率及变形量等工艺参数对流变应力和微观组织的影响。结果表明, 流变应力随着变形温度的降低和应变速率的提高而迅速增大。提高变形温度能够有效的促进动态再结晶过程, 在1100℃以上变形时, 在30%的工程应变量下即能够获得完全再结晶的锻态组织；当变形温度低于1050℃时, 工程应变超过60%仍未观察到动态再结晶。在变形量与热处理制度一定的条件下, 材料热处理后的晶粒度随变形温度的升高而增大。有效控制材料的变形温度是获得良好热加工塑性、降低变形抗力和获得均匀微观组织的关键措施。
The effects of temperature, strain rate and plastic strain on flow behavior and microstructures of GH4586 wrought superalloy were investigated by compressive deformation performed on MTS machine at deformation temperatures of 950 to 1150℃ and strain rates of 0.001 to 1 s-1. The results show that the flow stress increases drastically with the decrease of deformation temperature and the increase of strain rate. Dynamic recrystallization process can be effectively promoted by increasing deformation temperature. When deformation temperature is higher than 1100℃, completely recrystallized microstructures can be obtained with engineering strain of 30%, while when the temperature is lower than 1050℃, dynamic recrystallization does not occur with engineering strain up to 40\%. Grain size of annealed microstructures increases with the increase of deformation temperature. Ideal plasticity and resultant microstructures can be achieved by effective control of deformation temperature.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] | |
| [12] | |
| [13] | |
| [14] | |
| [15] | |
| [16] | |
| [17] | |
| [18] | |
| [19] | |
| [20] |
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